Series 988LF 1/8 DIN Microprocessor-Based Temperature/Process Controller 0600-0009-0000 Rev C October 1999 Supersedes: 0600-0009-0000 Rev B $10.00 Made in the U.S.A. Printed on Recycled Paper 10% Postconsumer Waste User’s Manual Includes 986L, 987L, 988L, and 989L User Level Targeted: • New User .............................. go to page i • Experienced User ................... go to page 2.1 • Expert User............................. go to page A.8 Installers: • Setup ..................................... go to page 4.1 • Wiring & Installation................ go to page 2.1 Watlow Controls 1241 Bundy Boulevard, P.O. Box 5580, Winona, Minnesota USA 55987-5580 Phone: (507) 454-5300, Fax: (507) 452-4507 http://www.watlow.com Registered Company Winona, Minnesota USA ISO 9001 96 TOTAL 3 Year Warranty CUS CUSTOMER SATISFA CTI CTI ON
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Series 988LF
1/8 DIN Microprocessor-Based Temperature/Process Controller
0600-0009-0000 Rev COctober 1999Supersedes: 0600-0009-0000 Rev B
$10.00Made in the U.S.A.
Printed on Recycled Paper 10% Postconsumer Waste
User’s ManualIncludes 986L, 987L, 988L, and 989L
User Level Targeted:• New User .............................. go to page i• Experienced User................... go to page 2.1• Expert User............................. go to page A.8Installers:• Setup ..................................... go to page 4.1• Wiring & Installation................ go to page 2.1
For best printing results, check these settings in your print set-up dialog box. * Color/Grayscale * Dithering * Highest possible DPI (dots per inch) -------------------------------- For best on-screen viewing, set your display control panel to the highest resolution available.
Introduction to the Watlow Series 988LFControllers
ii Using this Manualii Document Every Stepiii Notes, Cautions and Warningsiii Technical Assistanceiii We Value Your Feedback
Chapter 1Hardware Setup1.1 Dip Switch Locations and Functions
Chapter 2Installation and Wiring2.1 Panel Cutout and Dimensions2.2 Installing the Series 988LF2.3 Wiring the Series 988LF2.3 Input-to-output Isolation2.3 Power Wiring2.3 Sensor Installation Guidelines2.4 Wiring 0-20mA and 4-20mA
Process Inputs2.5 Wiring Example2.7 Input 1 Wiring2.8 Remote Set Point Option Wiring2.9 Output 1 Wiring2.10 Output 2 Wiring
Chapter 3Front Panel and Display Loop3.1 Keys and Displays3.2 Display Loop
Chapter 4The Setup Menus4.1 Navigating the Setup Menus4.2 Setup PromptsChapter 5The Operation Menus5.1 Navigating the Operation Menus5.2 Display Prompts
Chapter 6The Factory Menus6.1 Reaching the Diagnostics Menu6.5 Reaching the Calibration Menu
Chapter 7Tuning, Manual Operation, Alarms and Error Codes7.1 Auto-tuning (Heat and/or Cool)7.2 Manual Tuning7.3 Manual and Automatic Operation7.4 Using Alarms7.5 Error Code E1 and E2 Messages7.6 Error Code Actions
AppendixA.1 Warranty and ReturnsA.2 GlossaryA.4 IndexA.6 SpecificationsA.7 Model NumberA.8 Menu OverviewA.9 Declaration of Conformity
Table of Contents
Table of Contents WATLOW Series 988LF User’s Manual
WATLOW Series 988LF User’s Manual iIntroduction
Introduction To The Watlow Series 988LF Controllers
Figure Int.1 - The Series 988LFFeatures.
Welcome to the Watlow Series 988LF, a dual output, single input, micro-processor-based, 1/8 DIN, auto-tuning temperature control, featuringautomatic/manual capability with bumpless transfer. In the Auto mode,the control has closed loop control with sensory feedback, while theManual mode has open loop control with user defined output power level.The 988LF accepts a wide range of thermocouple sensors, along with RTD,and process inputs. The primary output is Heating or Cooling, while thesecondary output can be Heating, Cooling, or Alarm.
With the Series 988LF, you can select either PID or ON/OFF for output 1or Output 2. You may input a complete set of PID parameters for bothoutputs, or select automatic tuning for both heat and cool from the frontpanel. This includes proportional band, reset, rate, and cycle time. Bysetting either output’s proportional band to zero, the Series 988LFbecomes a simple ON/OFF control with a 3°F or 1.7°C switching differen-tial, 0.3°F or 0.17°C for 0.1° RTD.
Operator-friendly features include automatic LED indicators to aid inmonitoring and setup, as well as a calibration offset at the front panel.The Watlow Series 988LF automatically stores all information in a non-volatile memory.
TL WWA
PROCESS
L1 L2
DEV
% OUTDISPLAY
SERIES 988LF
MODE
AUTOMAN
Output 1ControlHeat/Cool
Output 2ControlHeat/CoolAlarm
Input 1Sensor Input
Input 2Remote Set Point Option
Auto-TuneHeat/Cool
Process Deviationfrom Set Point
Percent Power
ii WATLOW Series 988LF User’s Manual Introduction
Introduction
Using this Manual
This manual provides the information you will need to install and operatea Series 988LF controller.
If you need information about Series 988LF configurations and modelnumbers, refer to the Appendix of this manual.
This manual explains the five steps of setting up a Series 988LF con-troller:
1. Set and document all of the DIP switches, if applicable: Chapter 1.2. Mount the controller: Chapter 2.3. Wire and document the controller wiring: Chapter 2.4. Configure and document the controller software: Chapters 3-6.5. Run, test and adjust your application. Update documentation.
The Appendix provides definitions and specifications, along withapplication examples to help you optimize the safety and perfor-mance of your application. Use the Table of Contents and Index tofind specific information.
Document Every Step
The Series 988LF provides powerful control features. Carefully documenteach step of the setup and any subsequent changes. This will make itmuch easier to change, adjust and troubleshoot your application.
Make the configuration documentation available to engineers and techni-cians, on all shifts, who may need to work with the Series 988LF. We pro-vide space in this manual to record configurations. You may prefer tophotocopy the blank forms and keep them in a separate binder. However,you maintain your documentation; be sure to replace all old copies of thedocumentation with updated versions whenever the controller configura-tion is changed.
NOTE:The Menu Overviewin the Appendixshows all of themenus andprompts.
NOTE:The 12-digit numberis printed on the topof the stickers oneach side of thecontroller’s caseand on the right-hand or top circuitboard.
Introduction
WATLOW Series 988LF User’s Manual iiiIntroduction
Notes, Cautions and Warnings
We use note, caution and warning symbols throughout this book to drawyour attention to important operational and safety information.
A bold text “NOTE” marks a short message in the margin to alert you toan important detail.
A bold text “CAUTION” safety alert appears with information that isimportant for protecting your equipment and performance. Be especiallycareful to read and follow all cautions that apply to your application.
A bold text “WARNING” safety alert appears with information that isimportant for protecting you, others and equipment from damage. Payvery close attention to all warnings that apply to your application.
The ç symbol (an exclamation point in a triangle) precedes a generalCAUTION or WARNING statement.
The Ó symbol (a lightening bolt in a triangle) precedes an electric shockhazard CAUTION or WARNING safety statement.
Technical Assistance
If you encounter a problem with your Watlow controller, review all of yourconfiguration information for each step of the setup to verify that yourselections are consistent with your applications.
If the problem persists, an Application Engineer can discuss your applica-tion with you.
Before calling, please have the complete model number and user’s manualavailable. You can get technical support by dialing 507/494-5656, 7 a.m.to 7 p.m. Central Standard Time, or e-mail to [email protected].
WATLOW Series 988LF User’s Manual 1.1Hardware Setup, Chapter 1
Chapter 1 Hardware Setup
DIP Switch Locations and Functions
The Watlow Series 988LF has at least one and as many as three dual in-line package (DIP) switches inside the controller, depending on the modelnumber. They allow users to configure the controller for a variety ofinput sensors, or to lockout front panel access to some functions.
To set any DIP switch:• Remove the controller from the case by pressing firmly on the two
release tabs on one side or the top of the bezel until they unsnap. Thenfirmly press the two release tabs on the opposite side or the bottom ofthe control until they unsnap. You will need to gently rock the bezelback and forth to release it from the chassis.
• Use the illustrations on the following pages to locate and set each DIPswitch.
TL WWA
PROCESS
L1 L2
DEV
% OUTDISPLAY
SERIES 988LF
MODE
AUTOMAN
Release Tabs
Release Tabs
TL WWA
PROCESS
L1 L2
DEV
% OUT
MODE
SERIES 989LF
DSPY
AUTO
MAN
Release Tabs
Release Tabs
Figure 1.1 - Pressthe release tabs toremove the con-troller chassis.
1.2 WATLOW Series 988LF User’s Manual Hardware Setup, Chapter 1
DIP Switches
Figure 1.2 - Input DIP switches.
Input 1 Input 2 (Remote Set Point)
(98_L-2___-AA__) (98_L-_2__-AA__)
RTD
thermocouple: R, S or B
thermocouple: J, K, T, N, E, C, D, Pt2 or 0-50mV (high impedance)
0-20 or 4-20mA; 0-5, 1-5 or 0-10V
ON↑
123
ON↑
1 2 3
ON↑
123
ON↑
1 2 3
ON↑
123
ON↑
1 2 3
ON↑
123ON↑
1 2 3
Controller ChassisRear View
Input 1 DIP
Input 2 DIP
ON
ON
❶ Set the input DIPswitches to match the sen-sors you are using in yourapplication. Only con-trollers with model num-ber 98_L-2___-AA__ or98_L-_2__-AA__ have aninput DIP switch.
NOTE:The Input 2 DIPswitch is mountedupside down.
NOTE:Only controllerswith the indicatedmodel numbershave these DIPswitches.
WATLOW Series 988LF User’s Manual 1.3Hardware Setup, Chapter 1
DIP Switches
Figure 1.3 - Lockout DIP switch.
no hardware lockout or(Switch 1 has no effect.)
lockout Setup and Factory menus or(Switch 1 has no effect.)
ON↑
1 2ON↑
1 2
ON↑
1 2ON↑
1 2
Control ChassisTop View (986LF & 988LF)
Left-side View (987LF & 989LF)
LockoutDIP
ON
OFF
❷ The lockout DIP switchhides the Setup Menu and theFactory Menus (Diagnosticsand Calibration). All unitshave a lockout DIP switch.
çCAUTION:The lockout DIPswitch makes theSetup and Factorymenus unavailable.Configure all theSetup and Factorymenus before lock-ing them out.Failure to do socould result in dam-age to equipment inthe event of a setuperror.
1.4 WATLOW Series 988LF User’s Manual Hardware Setup, Chapter 1
Notes
WATLOW Series 988LF User’s Manual 2.1Installation and Wiring, Chapter 2
Chapter 2 Installation and Wiring
Panel Cutout
Maximum PanelThickness
0.38" (9.65mm)
3.62" + 0.03 -0.00(92mm + 0.8)
1.77 + 0.02 -0.00(45mm + 0.6)
4.03"(102mm)
2.18"(55 mm)
TL WWA
PROCESS
L1 L2
DEV
% OUTDISPLAY
SERIES 988LF
MODE
AUTOMAN
4.03"(102mm)
2.18"(55 mm)
TL WWA
PROCESS
L1 L2
DEV
% OUT
MODE
SERIES 989LF
DSPY
AUTO
MAN
Figure 2.1 - Series 988LF andSeries 989LFdimensions.
Panel AdjustableMounting Bracket
4.06"(103 mm)
0.68"(17 mm)
NOTE:Adjustable mount-ing brackets can beside-mounted.
NOTE:Space panelcutouts at least 1.66inches (42.2mm)apart.
NOTE:Holes can be cut inthe panel using aGreenlee 1/8 DINHydraulic Kit#60068 (punch#60069, die #60070).
2.2 WATLOW Series 988LF User’s Manual Installation and Wiring, Chapter 2
InstallationInstalling the Series 988LF
Installing and mounting requires access to the back of the panel.
1. Make a panel cutout.
2. To remove the controller chassis from its case, press in firmly on the twotabs on one side or the top of the bezel until they unsnap, then unsnapthe two tabs on the opposite side or the bottom. Pull the chassis out ofthe case by gently rocking it.
3. Slide the case into the panel cutout. Check to see that the gasket isnot twisted, and is seated within the case bezel flush with the panel.Slide the mounting collar over the back of the control.
Panel AdjustableMounting Bracket
Bezel
External Gasket Mounting Collar
Release Tabs
Top and Bottom (986LF or 988LF) or Side (987LF or 989LF) View
Mounting Slots
Side (986LF or 988LF) or Top and Bottom (987LF or 989LF) View
4. Loosen the mounting bracket screws enough to allow for the mountingcollar and panel thickness. Place each mounting bracket into themounting slots (head of the screw facing the back of the controller).Push each bracket backward then down to secure it to the controlcase. To guarantee a proper NEMA 4X seal, Series 986LF and988LF units (vertical) must have the mounting brackets located oneither side of the unit. When installing Series 987LF and 989LFunits (horizontal) the brackets must be on the top and bottom ofthe unit.
5. Make sure the case is seated properly. Tighten the installation screwsfirmly against the mounting collar to secure the unit. To ensure aNEMA 4X seal, there should be no space between the bezel andpanel. Overtightening the screws will distort the case and make it dif-ficult to remove or replace the controller.
6. Insert the controller chassis into its case and press the bezel until allfour tabs snap. Make sure the inside gasket is seated properly andnot twisted.
7. To release the mounting brackets, loosen the mounting bracket screwsand push the brackets forward, then pull it up and out.
NOTE:Removing the con-troller chassis fromits case makesmounting easier.
Figure 2.2 - Side and top view.
çCAUTION:Follow the installa-tion procedureexactly to guaranteea proper NEMA 4Xseal. Make sure thegasket between thepanel and the rim ofthe case is nottwisted and is seat-ed properly. Failureto do so couldresult in damage toequipment.
WATLOW Series 988LF User’s Manual 2.3Installation and Wiring, Chapter 2
Wiring
Wiring the Series 988LF
Wiring options depend on the model number and DIP switch settings.Check the terminal designation stickers on either side of the controllerand compare your model number to those shown here and with the modelnumber breakdown on the inside back cover of this manual.
Input-to-output Isolation
The Series 988LF uses optical isolation between the analog inputs and thecontroller outputs. This isolation provides a 500V~ (ac) barrier to preventground loops when using grounded sensors and/or peripheral equipment.
Here is a breakdown of the isolation barriers:• Analog inputs 1 and 2 are grouped together.• Outputs 1 and 2 are grouped together.
Power Wiring
100 to 240 V~ (ac), nominal (85 to 264 actual)
Vertical Package 98 8 L - _ _ _ _ - A A _ _Horizontal Package 98 9 L - _ _ _ _ - A A _ _
24 to 28 V‡‡ (ac/dc), nominal (20 to 30 actual)
Vertical Package 98 6 L - _ _ _ _ - A A _ _Horizontal Package 98 7 L - _ _ _ _ - A A _ _
Sensor Installation GuidelinesThermocouple input: Extension wire for thermocouples must be of thesame alloy as the thermocouple itself to limit errors.
Using grounded thermocouples for both input 1 and remote set pointoption may create ground loop problems. To correct this problem, replaceat least one of the grounded thermocouples with an ungrounded thermo-couple. If the application requires grounded thermocouples, use an isolat-ed transmitter, such as a Watlow Gordon 5702 isolated transmitter.
RTD input: Each 1Ω of lead wire resistance can cause a +2°F error whenusing a two-wire RTD. A three-wire RTD sensor overcomes this problem.All three wires must have the same electrical resistance (i.e., same gauge,same length, multi-stranded or solid, same metal).
Process input: Maintain isolation between input 1 and input 2 to preventa ground loop. A ground loop may cause incorrect readings, dashesacross the upper display or the display of error codes.
fuse
2221earth ground
11
L2L1+ -
∫WARNING:To avoid potentialelectric shock, useNational ElectricCode (NEC) safetypractices whenwiring and connect-ing this unit to apower source andto electrical sensorsor peripheraldevices. Failure todo so could resultin injury or death.
Figure 2.3 -Power wiring.
çCAUTION:The Series 988LFwill not functionwith two groundedthermocoupleinputs. Avoid usinga grounded thermo-couple for bothinput 1 and input 2.Failure to follow thisguideline couldresult in damage toequipment.
Wiring 0-20 and 4-20mA Process Inputs
Certain “transmitters” used in process input applications are producinginternal resistor failures in the Watlow Series 988 family of controllers.This is only apparent with the Series 988 family 1/8 DIN units withProcess Inputs selected (0-20mA or 4-20mA dc only).
We are noticing that an external resistor is required to prevent a high in-rush current which burns out the Series 988 family controllers’ 7-ohminternal resistor. This high in-rush current occurs initially on “power-up.”If the transmitter turns full on for a split second during power-up, theavailable current weakens or damages the internal resistor.
Example: 20V / 7 ohms = 2,857mA (too much!).
The wiring diagram example below shows an application where a customeris using a 4-20mA dc transmitter and power supply to feed the input of aSeries 988 controller. The Rx range (100 to 400 ohms) for the externalresistor is recommended. We suggest starting with 250 ohms.
Example: Customer is using a 24VÎ (dc) power supply to power up the 4-20mA dc transmitter that inputs to the Series 988 terminals 8 (-) and 10(+). To figure out what the internal Series 988’s handling current is for the0-20mA or 4-20mA dc input to the Series 988 controllers, we need toapply Ohm’s Law: The square root of Watts divided by Resistance equalsCurrent. Applying that formula to the example below produces the follow-ing: Square Root of (0.125 Watts / 7 ohms) = 134 mA dc (handling inputcurrent). This is the acceptable input current for the Series 988 universalinput board.
Reminder, the input impedance of 7 ohms handles the majority of ourcustomer applications; the external resistor (Rx) is only for certain trans-ducers/transmitters that spike on power-up or power-down. Please makesure your customer’s transmitter / transducer fall within our Series 988family (1/8 DIN) of controllers’ Process Input specification of 7 ohms inputimpedance.
InternalResistor
7Ω1/8 Watt
++ +
——
988 ProcessInput Control
4-20mA dcTransmitter
100 to 400ohms
24VÎ (dc)Power Supply
—
RxFigure 2.4 -Process wiringexample.
2.4 WATLOW Series 988LF User’s Manual
Wiring
WATLOW Series 988LF User’s Manual 2.5Installation and Wiring, Chapter 2
Wiring Example
Figure 2.5 - System wiringexample.
988L-10CA-AARRrear view
(+)
10
9
2221
12
13
(-)
L1
L2
(-)
120 VÅ (ac)
fuse
Series 146limit control146D-1J1F-1100
heater
process sensor limit sensor
optionalnormally open
momentary switch
red
high limitmechanical
contactor
earth ground
(+)
SSR-240-10A-DC1solid state relay
hightemp limit
light
coil
11
3 1
24
10 11 12 13 14 15 16 17
(+) (-)
1 2 3 4 5 6 7 8 9
fusefuse
+
-
C NO NC
1
120VÅ (ac)L1 L2
2
9
10
4
5
1 2
1
2
(+)
(-)
3
11
18
1213
14
15
21CR16
high temperature light
1
2
3
4
8
9
10
11
12
R
SSR-240-10A-DC1Solid State Relay
17
1 8heaterout
48-260VÅ (ac)
(+) (-)
in3-32VÎ (dc)
1 CR-1
9 10 2
12 + 13 -
21 22
5
6
7
Series 988LF988L-10CA-AARR
Temperature Control
13
57
9
11
1 3
13
14
10(+)
(-)
11
Series 146146D-1J1F-1100
Temperature Limit
3
1 2
4
∫WARNING:To avoid potentialelectric shock, useNational ElectricCode (NEC) safetypractices whenwiring and connect-ing this unit to apower source andto electrical sen-sors or peripheraldevices. Failure todo so could resultin injury or death.
çWARNING:Install high or lowtemperature limitcontrol protectionin systems wherean over tempera-ture fault conditioncould present a firehazard or other haz-ard. Failure toinstall temperaturelimit control protec-tion where a poten-tial hazard existscould result in dam-age to equipment,property and injuryto personnel.
çWARNING:To avoid damage toproperty and equip-ment, and/or injuryof loss of life, useNational ElectricCode (NEC) stan-dard wiring prac-tices to install andoperate the Series988LF. Failure to doso could result insuch damage,and/or injury ordeath.
Wiring Notes
L1 L2
power
earth ground
1121 22
çWARNING:To avoid damage toproperty and equip-ment, and/or injuryof loss of life, useNational ElectricCode (NEC) stan-dard wiring prac-tices to install andoperate the Series988LF. Failure to doso could result insuch damage,and/or injury ordeath.
Figure 2.6 - Wiring notes.
NOTE:Sketch in your appli-cation on this page ora copy of it. Seewiring examples inthis chapter and inthe Appendix.
2.6 WATLOW Series 988LF User’s Manual Installation and Wiring, Chapter 2
WATLOW Series 988LF User’s Manual 2.7Installation and Wiring, Chapter 2
Figure 2.7c — 0-5VÎÎ, 1-5VÎÎ or 0-10VÎÎ (dc) Process
Universal signal conditioner98 _ L - 2 _ _ _ - A A _ _
Input impedance: 10KΩ
Figure 2.7a — Thermocouple or 0-50mV (high impedance)
Thermocouple only98 _ L - 1 _ _ _ - A A _ _ (no DIP switches)
Universal signal conditioner98 _ L - 2 _ _ _ - A A _ _
Input impedance: 20MΩ
Figure 2.7b — RTD (2 or 3 Wire) 100ΩUniversal signal conditioner98 _ L - 2 _ _ _ - A A _ _
9
10
+-
0-50mV
9
10
8
S2
S1
S3
10
9-+
Figure 2.7d — 0-20mA or 4-20mA ProcessUniversal signal conditioner98 _ L - 2 _ _ _ - A A _ _
çCAUTION:An external resistoris required for0-20mA and 4-20mAprocess wiring toprevent a high in-rush current whichcould burn out thecontroller’s 7-ohmresistor. See page2.4 for recommen-dations.
2.8 WATLOW Series 988LF User’s Manual Installation and Wiring, Chapter 2
Figure 2.8d — 0-20mA or 4-20mA Process
Universal signal conditioner
98 _ L - _ 2 _ _ - A A _ _
Input impedance: 7Ω
Remote Set Point Option
Figure 2.8c — 0-5VÎÎ, 1-5VÎÎ or 0-10VÎÎ (dc) Process
Universal signal conditioner
98 _ L - _ 2 _ _ - A A _ _
Input impedance: 10KΩ
Remote Set Point Option
Figure 2.8b — RTD (2 or 3 Wire) 100ΩUniversal signal conditioner98 _ L - _ 2 _ _ - A A _ _
Remote Set Point Option
20
19-+
Figure 2.8a — Thermocouple or 0-50mV (high impedance)
Universal signal conditioner98 _ L - _ 2 _ _ - A A _ _
çCAUTION:An external resistoris required for0-20mA and 4-20mAprocess wiring toprevent a high in-rush current whichcould burn out thecontroller’s 7-ohmresistor. See page2.4 for recommen-dations.
WATLOW Series 988LF User’s Manual 2.9Installation and Wiring, Chapter 2
Figure 2.9a — AC Outputs
Solid-state Relay with Contact Suppression98 _ L - _ _ B _ - A A _ _0.5 amps, minimum off-state impedance: 20KΩ
Electromechanical Relay with Contact Suppression (NO and COM contacts only)98 _ L - _ _ D _ - A A _ _Form C, 5 amps, minimum off-state impedance: 20KΩ
Electromechanical Relay without Contact Suppression98 _ L - _ _ E _ - A A _ _Form C, 5 amps off-state impedance: 31MΩ
Solid-state Relay without Contact Suppression98 _ L - _ _ K _ - A A _ _0.5 amps, off-state impedance: 31MΩ
Output 1 Wiring
Figure 2.9b — Switched DC, Open Collector
98 _ L - _ _ C _ - A A _ _
Minimum load resistance: 500Ω
External Load
COM L1
L2
Fuse
NO12
13
NC14(#14 for D & E outputs only)
12External
Load
+
13
14
-
COM
Figure 2.9d — 0-5VÎÎ, 1-5VÎÎ and 0-10VÎÎ (dc) Process
WATLOW Series 988LF User’s Manual 3.1Front Panel and Display Loop, Chapter 3
Upper DisplayIndicates the actual process value,prompt parameter value or errorcode.
DEV LEDWhen lit, the lower display showsthe current deviation from the setpoint.
% OUT LEDWhen lit, the lower display showsthe current percent output.
Up-arrow KeyIncreases the value or changes theparameter in the upper display(except for set point changes in theDisplay Loop, which occur in thelower display). Hold the key downto increase the value rapidly. Newdata takes effect in five seconds orwhen the Mode key or Display keyis pressed.
Up + Down KeysPress simultaneously for three sec-onds to go to the Setup Menu.Continue to press both keys foranother three seconds to go to theFactory Menu. Access to the Setupand Factory menus can be dis-abled with lockout DIP switch.
Lower DisplayIndicates the set point, deviation,percent power, temperature unit,menu prompt name or alarm code.
L1, L2These LED’s indicate when output1 or 2 are active. Outputs can beconfigured as:Ot1 ControlOt2 Control or Alarm
Display KeyPressing this key enters theDisplay Loop. Press the Displaykey at any time to return to thisloop. The next page has moreinformation on the Display Loop.
Auto/Man KeyIn Manual mode the lower displayshows percent output. Pressedonce, it clears a latched alarms. Ifpressed again within five secondsit will toggle between Auto andManual mode.
Auto/Man LEDLit when the control is in Manualoperation. Press the Auto/Man keytwice to enter Automatic operation.When blinking, press the Auto/Mankey to toggle between Auto andManual. After five seconds withoutpressing the Auto/Man key, theLED stops blinking and returns toits previous state.
TL WWA
PROCESS
L1 L2
DEV
% OUTDISPLAY
SERIES 988LF
MODE
AUTOMAN
Mode KeyEnters new data and steps tothe next prompt in the currentmenu.
Mode + Up-arrow KeysHold the Mode key then pressthe Up-arrow key to movebackwards through the cur-rent menu. Scrolling stopswhen you reach the top of themenu.
Figure 3.1 - Series 988LF Keys and Displays
Down-arrow KeyDecreases the value or changesthe parameter in the upper display(except for set point changes in theDisplay Loop, which occur in thelower display). Hold the key downto decrease the value rapidly. Newdata takes effect in five seconds orwhen the Mode key or Display keyis pressed.
Chapter 3 Front Panel and Display Loop
Keys and Displays
3.2 WATLOW Series 988LF User’s Manual Front Panel and Display Loop, Chapter 3
Display Loop
Display Loop
The Display Loop is the “home” state of the Series 988LF controller. Pressing theDisplay key ∂ returns the controller to the Display Loop from any prompt in anymenu. The controller automatically returns to the Display Loop from any menuwhen a minute passes without any keys being pressed.
Figure 3.2 - The Display Loop
units selected (units, °F or °C)
set point 1 (change with Up-arrow > or Down-arrow < key)
deviation from set point, process 1 minus set point 1 (DEV light on)
percent output (%OUT light on)
current input 1 reading
current input 1 reading
current input 1 reading
current input 1 reading
[`988][`988]
[`988][`988]
[`988][`100]
[`988][``°C]
DISPLAY
DISPLAY
DISPLAY
DISPLAY
NOTE:For information oninput 1 [`In1]
ranges, refer toChapter 4.
Setup
Setup Menu, Chapter 4 WATLOW Series 988LF Users Manual 4.1
Chapter 4 The Setup Menu
Navigating the Setup Menu
The Setup Menu displays the parameters that configure the Series 988LF’sfeatures to your application.
❶ To enter the Setup Menu, press the Up-arrow >and Down-arrow < keys for three seconds. Thelower display shows the LOC [`LOC] prompt, and theupper displays shows its current level. All keys areinactive until you release both keys.
RTD Calibration Curve
Latching
Alarm Type
Output 2
Process 1
Output 1
Range High 1
Range Low 1
C or F
Decimal
Range Low 2
Range High 2
Lock
Input 1
Remote Set Point
Enter your settings,from the controller's upper display.
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
[`In1]
[`LOC]
[`rSp]
[`rL2]
[`rH2]
[`dEC]
[`C_F]
[`rL1]
[`rH1]
[`Ot1]
[Prc1]
[`Ot2]
[`ALt]
[`Lat]
[`rtd]
MODE
Silencing[`SIL]
Figure 4.1 -The Setup Menu
TLTL WWA
PROCESS
L1 L2
DEV
% OUTDISPLAY
SERIES 988LF
MODE
AUTOMAN
[```1][`LOC]
[```0][`LOC]
[```2][`LOC]
[```3][`LOC]
❷ Press the Up-arrow > or theDown-arrow < key to select oneof the prompt values
Setup
4.2 WATLOW Series 988LF Users Manual Setup Menu, Chapter 4
Setup Prompts
❸ Use the Mode key µ to advance through theSetup Menu. You will not see every prompt in theSetup menu; the unit’s configuration and modelnumber determine which prompts appear.
❹ Use the Up-arrow > and Down-arrow < keysto change the prompt setting. To move backwardsthrough the menu hold the Mode key µ downand press the Up-arrow key >. Refer to theAppendix for model number options.
Front Panel Lockout
Sets the lockout level for the front panel. This allows you to disablekeys on the front of the controller.
• [```0] enables all keys.
• [```1] disables the Mode key µ.
• [```2] disables the Mode key µ and the Auto/Man key å.
• [```3] disables all keys.
[`LOC] This prompt always appears.
Default↓
[```O] [```1] [```2] [```3]
[`LOC] [`LOC] [`LOC] [`LOC]
NOTE:Decimal points may notalways be in theposition specifieddepending on thesettings in the Decimal[`dEC] parameters inthe Setup Menu.
çCaution:Setting [`LOC] to[```2] or [```3]disables the Auto/Mankey å and will forcethe controller intomanual mode if an opensensor occurs. Verifythat the controller isoperating in the desiredmode (auto or manual)before setting thelockout level. Failure todo so could result indamage to equipmentand/or property.
[`LOC]
TL WWA
PROCESS
L1 L2
DEV
% OUTDISPLAY
SERIES 988LF
MODE
AUTOMAN
TL WWA
PROCESS
L1 L2
DEV
% OUTDISPLAY
SERIES 988LF
MODE
AUTOMAN
Setup
Setup Menu, Chapter 4 WATLOW Series 988LF Users Manual 4.3
[`In1]
çCaution:Changing the value of[`In1] changes mostother prompts to thefactory default values.Verify the correctsensor type beforemaking a change.Failure to follow thisguideline could result indamage to equipment orproperty.
Input 1Select sensor input type. This selection must match the sensor typeconnected to terminals 8, 9 and 10. See Appendix for more informationabout sensors.
• Changing the value of [`In1] changes all other prompts to thefactory default values, [`LOC] Lock prompt and the [`C_F] promptin the Setup Menu. If you change the value, the default warning[[[[[dFLt] will flash in the upper display.
• Changes do not take effect automatically after five seconds; you mustpress the Mode key µ to enter the selector type change and advance tothe next prompt.
4.4 WATLOW Series 988LF Users Manual Setup Menu, Chapter 4
Range Low and Range HighSelect the low and high range for input 1. These prompts limit theadjustment range for the set points. The default values are the same asthe limits of the sensor you selected by setting the input DIP switch andselecting a value for Input [`In1].
• Process inputs are scaled by these values. Range high is the valuedisplayed when the maximum process signal is present at the input.Range low is the value displayed when the minimum process signal ispresent at the input.
Example: Set [`In1] to [4-20] mA.Set [`rL1] to [`100].Set [`rH1] to [`500].A 4mA input will display [`100].A 12mA input will display [`300].A 20mA input will display [`500].
• The low and high values of each sensor type are listed on the specifica-tions page of the Appendix.
• Choose between Fahrenheit and Celsius at the [`C_F] prompt in theSetup Menu.
[```r] [``32]…[3200] [```0]]…[1760] 98_L-2__-AA__ only
[```S] [``32]…[3200] [```0]…[1760]
[`rL1]
[`rH1]
[`rL1]
[`rH1]Range Low and RangeHigh continued on nextpage.
NOTE:These values do notaffect the low or the highset point limit forprocess alarms.
NOTE:When high impedance[`0-50] is selected forInput 1, the range highfor both [``°C] and[``°F] can be extendedto [9999]. The rangelow, when [``°C] isselected, can be ex-tended to [-999]
Setup
Setup Menu, Chapter 4 WATLOW Series 988LF Users Manual 4.5
[`rL1]
[`rH1]Range Low and RangeHigh continued fromprevious page.
NOTE:The range high [`rH1]
value for processinputs can be extendedto [9999].
Default Default Default Default↓ ↓ ↓ ↓
``°F] [`°C]
[`rL1] [`rH1] [`rL1] [`rH1]
[```b] [``32]…[3300] [```0]…[1816]
[`rtd] [-328]…[1472] [-200]…[`800]
[`r†d] [-9(9]…[99(9] [-7#3]…[53&7]
process[4-20] [-999]…[`999] units
[0-20] [-999]…[`999] units
[`0-5] [-999]…[`999] units
[`1-5] [-999]…[`999] units
[0-10] [-999]…[`999] units
[0-50] [-999]…[`999] units
RTD Calibration CurveSelect the RTD calibration curve. The RTD input uses either theEuropean (DIN, 0.003850 ohms/ohms/°C) or Japanese (JIS, 0.003916ohms/ohms/°C) linearization standard.
[`rtd] This prompt appears only if you have set [`In1] to [`rtd] or[`r†d].
Default↓
[`din] [`J15]
[`rtd [`rtd
[`rtd]
Setup
4.6 WATLOW Series 988LF Users Manual Setup Menu, Chapter 4
[`dEC] DecimalSelect the decimal point location for process type input 1 data. Thisprompt, in conjunction with the Range Low and Range High prompts,allows you to format and limit units of measure for process 1.
• All prompts with units of measure related to input 1 will display in theselected decimal format.
• This affects propbands, alarm set points, process set points, calibrationoffsets, deadbands and ranges.
[`dEC] This prompt appears only if you have set input 1 [`In1] to aprocess input or a thermocouple input set to [0-50] mV.
Default↓
[```)] [``)0] [`)00 [)000]
[`dEC] [`dEC] [`dEC] [`dEC]
Remote Set Point InputEnable a remote set point signal. The remote set point input selectionswitches are set to process at the factory.
[`rSP] This prompt appears only on controllers equipped with Remote SetPoint Input hardware (98 _ L-_ 2__-AA__).
[`rSP]Remote Set Point Inputcontinued on next page.
ON↑
1 2 3
ON↑
1 2 3
Setup
Setup Menu, Chapter 4 WATLOW Series 988LF Users Manual 4.7
[`rSP]Remote Set Point Inputcontinued from previouspage.
Range Low 2 and Range High 2
Select the low and high range for Remote Set Point Input. Theseprompts limit the adjustment range for the set points. The default valuesare the same as the limits of the sensor you selected by setting the input 2DIP switch and selecting a value for Input 2 [`In2].
[`rL2] [`rH2] These prompts appear only on controllers equipped withRemote Set Point Input hardware (98 _ L-_ 2__-AA__).
• Process inputs are scaled by these values. Range high is the valuedisplayed when the maximum process signal is present at the input.Range low is the value displayed when the minimum process signal ispresent at the input.
Example: Set [`rSP] to [4-20]mA.Set [`rL2] to [`100].Set [`rH2] to [`500].A 4mA input will display [`100].A 12mA input will display [`300].A 20mA input will display [`500].
• The low and high values of each sensor type are listed on the specifica-tions page of the Appendix.
• Choose between Fahrenheit and Celsius at the [`C_F] prompt in theSetup Menu.
[`rL2] [`rH2] These prompts appear only if the controller is equippedwith Remote Set Point Input hardware and with Remote Set Point Input[`rSP] not set to [`OFF].
Default DefaultDefault Default↓ ↓ ↓ ↓
``°F] [`°C]
[`rL2] [`rH2] [`rL2] [`rH2]
[```J] [``32]…[1500] [```0]…`816] 98_L-1__-AA__ or
[`in2] [`rL2] [`rH2] [`rL2] [`rH2] 98_L-2__-AA__
[`rL2]
[`rH2]
[`rL2]
[`rH2]Range Low 2 and RangeHigh 2 continued on nextpage.
4.8 WATLOW Series 988LF Users Manual Setup Menu, Chapter 4
Default Default Default↓ ↓ ↓ ↓
(K) ``°F] [`°C]
[```H] [-328]…[2500] [-200]…[1371]
[```t] [-328]…[`750] [-200]…[`399]
[```n] ``32]…[2372] [```0]…[1300]
[```E] [-328]…[1470] [-200]…[`799]
(W5)[```C] [``32]…[4200] [```0]]]…[2316]
(W3)[```d] [``32]…[4200] [```0]]]…[2316]
[`Pt2] [``32]…[2543 [```0]]…[1395]
high impedance[0-50] [-999]…[[`999] [-573]…[`573]
[```r] [``32]…[3200] [```0]]…[1760] 98_L-2__-AA__ only
[```S] [``32]…[3200] [```0]…[1760]
[```b] [``32]…[3300] [```0]…[1816]
[`rtd] [-328]…[1472] [-200]…[`800]
[`r†d] [-9(9]…[99(9] [-7#3]…[53&7]
process[4-20] [-999]…[`999] units
[0-20] [-999]…[`999] units
[`0-5] [-999]…[`999] units
[`1-5] [-999]…[`999] units
[0-10] [-999]…[`999] units
[0-50] [-999]…[`999] units
[0=00] [-999]…[`999] units
Celsius-Fahrenheit
Select which temperature scale the controller will use.
[`C_F] This prompt appears only on controllers with either Input 1 setto something other than a process input.
Default↓
[``°f] [``°C]
[`C_F] [`C_F]
[`rL2]
[`rH2]Range Low 2 and RangeHigh 2 continued fromprevious page.
NOTE:When high impedance[`0-50] is selected forInput 1, the range highfor both [``°C] and[``°F] can be extendedto [9999]. The rangelow, when [``°C] isselected, can beextended to [-999]
NOTE:The range high [`rH2]value for processinputs can be extendedto [9999].
NOTE:These values do notaffect the low or the highset point limit forprocess alarms.
[`C_F]
Setup
Setup Menu, Chapter 4 WATLOW Series 988LF Users Manual 4.9
[`Ot2]
Output 1Set the way that output 1 will respond to a difference between the setpoint and an input variable.
• [``Ht](Heat) select reverse action, so that output 1 responds when theinput signal is less than the setpoint.
• [``CL](Cool) select direct action, so that output 1 responds when theinput signal is more than the setpoint.
[`Ot1] This prompt always appears.
Default↓
[``Ht] [``CL]
[`Ot1] [`Ot1]
Process 1Select the process range for output 1.
• [Prc1] This prompt appears only on controllers equipped with output 1process hardware (98__-__F_-___).
• [``AL] de-energizes output 2 in an alarm condition.
• [`ALn] energizes output 2 in an alarm condition.
• [``Ht](Heat) selects reverse action, so that output 2 responds when theinput signal is less than the set point.
• [``CL](Cool) selects direct action, so that output 2 responds when theinput signal is more than the set point.
[`Ot2] This prompt appears only on controllers equipped with output 2hardware (not 98_L-___A-AA__).
Default↓
[``no] [``AL] [`Aln] [``Ht] [``CL]
[`Ot2] [`Ot2] [`Ot2] [`Ot2] [`Ot2]
[`Ot1]
[Prc1]
Setup
4.10 WATLOW Series 988LF Users Manual Setup Menu, Chapter 4
[`SIL]
[`ALt] Alarm Type
Selects the alarm type when Output 2 has been selected as an alarm.
• [``Pr] uses the process signal from input 1.
• [``de] uses a deviation from the input 1 signal.
[`ALt This prompt appears only on controllers equipped with output 2hardware (not 98_L-___A-AA__). and with [`Ot2] set to [``AL] or [`ALn].
Default↓
[``Pr] [``de]
[`ALt] [`ALt]
LatchingSelect whether alarm for output 2 will be latching or non-latching. Alatching alarm [`LAt] must be turned off manually. A non-latching alarm[`nLA] turns off when an alarm condition no longer exists.
[`LAt] This prompt appears only on controllers equipped with output 2hardware (not 98_L-___A-AA__) and with [`Ot2] set to [``AL] or [`ALn].
Default↓
[`nLA] [`LAt]
[`LAt] [`LAt]
Silencing
Select silencing to inhibit alarm for Output 2 on startup and to allowthe operator to reset the alarm output, not the visual display.
• Silencing disables the alarm until the signal is between [A2LO] and[`AHI].
[`AL2] This prompt appears only on controllers equipped with output 2hardware (not 98_L-___A-AA__) and with [`Ot2] set to [``AL] or [[`ALn].
Default↓
[`OFF] [``On]
[[`SIL] [[`SIL]
[`LAt]
Operations
Operations Menu, Chapter 5 WATLOW Series 988LF Users Manual 5.1
Navigating the Operation Menus
❶ To reach the Operation Menus, begin in theDisplay Loop and press the Mode key µ.Depending on the controller configuration, either theSet Point 2 prompt [`SP2], or the ProportionalBand, Output 1 prompt [`Pb1] will appear in thelower display. You will not see every prompt in theOperation Menu; the unit’s configuration and modelnumber determine which prompts appear.
NOTE:Press the Display Key∂ to return to theDisplay Loop from anypoint in any menu.
Figure 5.1 -Navigating theOperations Menu.
Chapter 5 The Operation Menu
Alarm Hi
Deadband
Cycle Time 2
Rate 2
Proportional Band 2
Reset 2
Proportional Band 1
Reset 1
Rate 1
Cycle Time 1
Enter your settings,from the controller's upper display.
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
Alarm Lo
MODE
Set Point 2[`SP2]
[`Pb1]
[`rE1]
[`rA1]
Local-remote
Calibration Offset
MODE
MODE
MODE
Auto-tune
[`Ct1]
[`Pb2]
[`rE2]
[`rA2]
[`CT2]
[``dB]
[`ALO]
[`AHI]
[`CAL]
[`AUT]
[`L-r]
TLTL WWA
PROCESS
L1 L2
DEV
% OUTDISPLAY
SERIES 988LF
MODE
AUTOMAN
❷ Use the Up-arrow > or theDown-arrow < key to select oneof the prompt values.
Operations
5.2 WATLOW Series 988LF Users Manual Operations Menu, Chapter 5
Display Prompts
❸ Use the Mode key µ to advance through the OperationsMenu. You will not see every prompt in the Operationsmenu; the unit’s configuration and model number determinewhich prompts appear.
❹ Use the Up-arrow > and Down-arrow <keys to change the prompt setting. To movebackwards through the menu hold the Modekey µ down and press the Up-arrow key >.Refer to the Appendix for model numberoptions.
NOTE:Decimal points may notalways be in theposition specified belowdepending on thesettings in the DecimaldECdECdECdECdEC parameters in theSetup Menu.
TLTL WWA
PROCESS
L1 L2
DEV
% OUTDISPLAY
SERIES 988LF
MODE
AUTOMAN
Set Point 2
Select a second set point that will activate output 2. This allows youto boost the heating (reverse acting) or cooling (direct acting) action of theoutput 1 device.
• The range and default settings depend on the [`In1], [`rL1], and[`rH1] settings (Setup Menu).
[`SP2] This prompt appears only if [`Ot1] and [`Ot2] (Setup Menu) areboth set to [`Ht] or [`CL].
[`rL1] … [`rH1][`SP2] [`SP2]
[`SP2]
Proportional Band, Output 1
Select the proportional band for PID output 1. If set to [```0] itfunctions as an on/off control with a 3°F or 1.7°C switching differential forranges displayed in whole degrees, and 0.3°F or 0.17°C for rangesdisplayed on 0.1°. The default is 25°F/17°C.
Operations Menu, Chapter 5 WATLOW Series 988LF Users Manual 5.3
[`rE1] Reset, Output 1
Tune the control action to eliminate the offset or droop between theset point and the actual process value for PID output 1.
[`rE1] This prompt appears only if [`Pb1] is set to greater than [```0].
Default↓
[`0)0] … [99(9] repeats/min.[`rE1] [`rE1]
Rate, Output 1
Tune the rate to eliminate overshoot on startup or after the set pointchanges for Output 1. The rate setting will not influence the percentpower if the process value is more than twice the proportional band fromthe set point.
[`RA1] This prompt appears only if [`Pb1] is set to greater than [```0].
Default↓
[`)00] … [`(99] min.[`rA1] [`rA1]
[`rA1]
Cycle Time, Output 1
Select the time, in seconds, of a complete on/off cycle.
[`Ct1] This prompt appears only if [`Pb1] is set to greater than [```0].This prompt does not appear if Output 1 is a process output.
5.4 WATLOW Series 988LF Users Manual Operations Menu, Chapter 5
Rate, Output 2Tune the rate to eliminate overshoot on startup or after the set pointchanges for Output 2. The rate setting will not influence the percentpower if the process value is more than twice the proportional band fromthe set point.
[`RA2] This prompt appears only if [`Pb2] is set to greater than [```0].
Default↓
[`)00] … [`(99] min.[`rA2] [`rA2]
[`rA2]
Reset, Output 2Tune the control action to eliminate the offset or droop between theset point and the actual process value for PID output 2.
[`rE2] This prompt appears only if [`Pb2] is set to greater than [```0].
Default↓
[`0)0] … [99(9] repeats/min.[`rE2] [`rE2]
[`rE2]
Proportional Band, Output 2Select the proportional band for PID output 2. If set to [```0] itfunctions as an on/off control. If set to [```0] it functions as an on/offcontrol with a 3°F or 1.7°C switching differential for ranges displayed inwhole degrees, and 0.3°F or 0.17°C for ranges displayed on 0.1°. Thedefault is 25°F/17°C.
[`Pb2] This prompt appears if Output 2 [`Ot2] (Setup Menu) is set to[``Ht] or [``CL].
Operations Menu, Chapter 5 WATLOW Series 988LF Users Manual 5.5
Dead Band
Select the width of the zone between the action of the heating(reverse acting) output and the cooling (direct acting) output. Thisshifts the cool setpoint by the dead band value entered. If you select apositive value the heat and cool outputs cannot be energized at the sametime. If you select a negative value, both outputs can be energized at thesame time.
If Default↓ ↓
[``°F] [-999] … [```0] … [`999]
[`C_F] [``db] [``db] [``db]
(Setup Menu)
[``°C] [-555] … [```0] … [`555]
[`C_F] [``db] [``db] [``db]
a process [-999] … [```0] … [`999] unitsinput is selected [``db] [``db] [``db]
[``db]
[`Ct2] Cycle Time, Output 2Select the time, in seconds, of a complete on/off cycle.
[`Ct2] This prompt appears if Output 2 [`Ot2] (Setup Menu) is set to[``Ht] or [``CL], and if [`Pb2] is set to greater than [```0].
Alarm LoSelect the low trigger value for the output 2 alarm. Represents the lowprocess alarm or low deviation alarm.
[`ALO] This prompt appears only if [`Ot2] parameter is set to [``AL] or[`ALn].
If Default↓ ↓
lowest value of[`Pr1] value of … [`rL1] (or [`rL2]) … [`AHI]
[`AL0] sensor in Setup Menu [`ALO]
range
[`dE1] [-999] … [```0]
`AL0] [`ALO] [`ALO]
[`AL0
Operations
Operations Menu, Chapter 5 WATLOW Series 988LF Users Manual 5.7
Local-remote
Selects a local or remote set point. With [```r] selected the controllerdisplays the remote set point rather than the internal (local) set point, andthe set point cannot be changed with the Up-arrow > or Down-arrow <key.
[`L-r] This prompt appears if [`rSP] (Setup Menu) is not equal to [`OFF].
Default↓
[```L] [```r][`L-r] [`L-r]
[`L-r]
Auto-tune
Initiate an auto-tune.
[`AUt] This prompt always appears.
Default↓
[`OFF] [``On][`CAL] [`AUt]
[`AUt]
NOTE:For more information onauto-tune, see Chapter7.
Calibration Offset
Add or subtract degrees from the input signal. This allows you tocompensate for lead resistance, sensor errors, or other factors.
5.8 WATLOW Series 988LF Users Manual Operations Menu, Chapter 5
Notes
Factory Menus, Chapter 6 WATLOW Series 988LF Users Manual 6.1
Chapter 6 The Factory Menus
❶ Press the Up-arrow > and Down-arrow < keys together and holduntil the [`LOC] prompt appears in the lower display. Press and hold againuntil the [Fcty] prompt appears in the lower display.
❷ Use the Up-arrow > key tostep from the Calibration Menu[`CAL] to the Diagnostics Menu[diag].
❸ Press the Mode key µ tostep through the prompts.
❹ Press the Up-arrow key > orthe Down-arrow key < toselect one of the prompt values.
In the Diagnostics Menu onlythe values of [dISP], [tout],and [OPLP] can be changed.
Reaching the Diagnostics Menu
[diAg][`CAL][Fcty] [Fcty]
Diagnostics Calibration
Menu Menup. 6.1 p 6.5
Figure 6.1The Diagnostics Menu
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
MODE
Document your settings, from the controller's upper display.
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
[date]
[SOft]
[Sn--]
[AMB]
[Acnt]
[`gnd]
[cnt1]
[cnt2]
[ity1]
[ity2]
[Oty1]
[Oty2]
[dISP]
[tout]
[OPLP]
Factory Ship Date
Software Revision
Serial Number
Ambient Temperature
Ambient A/D count
Ground A/D count
Input 1 A/D count
Input 2 A/D count
Input 1 Module Type
Input 2 Module Type
Output 1 Module Type
Output 2 Module Type
Test Display
Test Outputs
Open Loop
[Diag][Fcty] Factory Prompt
[``no][`YES][diSP] [diSP]
[`OFF][out1][out2][tout] [tout] [tout]
6.2 WATLOW Series 988LF Users Manual Factory Menus, Chapter 6
Factory Ship Date
Shows the date that the final factory control test was performed. Thefirst two digits represent the week as numbered from [01``] to [52``].The second two digits represent the year [``97], [``98], etc…
[dAtE] This prompt always appears.
Software Revision
Shows the controller’s software revision code. This letter indicates thesoftware revision of your controller; [50`d].
[SOFt] This prompt always appears.
Serial Number
Shows the controller’s serial number. The first two letters in the upperdisplay are to indicate that the controller is in serial number mode. Theright half of the upper display shows the first two digits of the serial num-ber. The lower display shows the last four digits of the serial number.
[Sn34]
[5678]
This is what the controller with the serial number 0988345678 woulddisplay.
[Sn``] This prompt always appears.
Ambient Temperature
Shows the ambient temperature at the Input 1 terminals. The tem-perature is shown in °F in the form [00)0] regardless of the settings of[deC1], [deC2], [`dfL], or [`C_F].
[AMb] This prompt always appears.
Factory Use Only
These prompts are used only at the factory.
[Acnt] [`gnd] [cnt1] [cnt2] These prompts always appear.
[Acnt]
[`gnd]
[cnt1]
[cnt2]
[Sn--]
[SOFt]
[dAtE]
[AMb]
Factory-Diagnostics
Factory Menus, Chapter 6 WATLOW Series 988LF Users Manual 6.3
Inputs 1 and 2 Module Types
Displays which input module is installed in the controller. Pleasedocument this value before contacting the factory for technical assistance.
Input Types
• [none] No input module• [``tc] Thermocouple only module• [UOFF] Universal off• [Urtd] Universal rtd• [Utch] Universal high-gain thermocouple• [UtcL] Universal low-gain thermocouple• [UMu] Universal millivolts• [UPrc] Universal process
[ity1] [ity2] These prompts always appear.
Outputs 1 and 2 Module Types
Displays which output module is installed in the controller. Pleasedocument this value before contacting the factory for technical assistance.
Output Types
• [none] no output module• [SSr1] 0.5A solid-state relay• [SS1S] 0.5A solid-state relay with suppression• [``dc] switched DC output• [rLcS] form C relay with suppression• [Proc] process output (Output 1 only)
[Oty1] [Oty2][Oty1] [Oty2][Oty1] [Oty2][Oty1] [Oty2][Oty1] [Oty2] These prompts always appear.
Test Displays
Runs a brief test of the controller’s displays and LEDs. To run the test,scroll through the Diagnostics Menu until [disp] is shown in the lowerdisplay. Use the Up-arrow key > or Down-arrow key < to select[`YES] from the upper display and press the mode key µ.
The controller will run pattern tests, blink all the LEDs on and off, andend with the model number in both displays.
[diSP] This prompt always appears.
Default↓
[``no] [`yes][disp] [disp]
[ity1][ity2]
[Oty1][Oty2]
[diSP]
Factory-Diagnostics
6.4 WATLOW Series 988LF Users Manual Factory Menus, Chapter 6
Test Outputs
This prompt tests each output. To run the test, scroll through theDiagnostics Menu until [tout] is shown in the lower display. Use the Up-arrow key > or Down-arrow key < to select an output [out1] or[out2]. The LED for that output should light after a second or two indicat-ing that the output has been successfully energized. Do not press themode key µ to activate the test; it starts automatically when anythingother than [`OFF] is selected.
If any of the LEDs fail to light contact the factory.
[tout] This prompt always appears.
Default↓
[`OFF] [out1] [out2][tout] [tout] [tout]
Open Loop
Checks the control loop, consisting of the controller output, powercontrol, heater and sensor. With open loop enabled, the controller moni-tors the output power level and checks for a change in the process inputvalue. If the output power is at maximum for a period of time equal to thereset time and the process input has not changed by at least ±5°F, thecontroller will switch to manual mode at 0% output power and [OPLP] willbe displayed in the lower display.
To clear this error, enter the Setup Menu and press the display key ∂. Toget back into auto mode, press the Auto/Man key å.
[OPLP] This prompt always appears.
Default↓
[`OFF] [``On][OPLP] [OPLP]
[tout]
[OPLP]
Factory-Diagnostics
Factory Menus, Chapter 6 WATLOW Series 988LF Users Manual 6.5
❶ Press the Up-arrow > and Down-arrow< keys together and hold until the [`LOC]prompt appears in the lower display. Pressand hold again until the [Fcty] promptappears in the lower display.❷ Use the Up-arrow key > to select theCalibration Menu [`CAL] in the upperdisplay.
❸ Press the Mode key µ to step throughthe prompts.
❹ Press the Up-arrow key > or the Down-arrow key < to select one of the promptvalues.
Refer to Calibrating Watlow Process Controlsfor information about the Calibration Menu.
Reaching the Calibration Menu
[diAg][`CAL][Fcty] [Fcty]
Diagnostics Calibration
Menu Menup. 6.1 p 6.5
[``no][`YES][`rSt] [`rSt]
Figure 6.5 -The Calibration Menu
çCAUTION:Before attempting to calibrate, make sure you have theproper equipment called for in each procedure. TheSeries 988LF is calibrated and tested before it leavesthe factory. Attempting to calibrate the controllerwithout the proper equipment could result in damageto property and/or equipment.
Factory-Calibration
MODE
Diagnostics Prompt Document your settfrom the controller'supper display.
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
MODE
[`CAL]][Fcty]
[A`50]
[A`00]
[``tc]
[a`0H]
[A`20]
[A`15]
[A380]
[A10U]
[A`0U]
[A20A]
[A`4A]
[A`OU]
[A100]
[b`50]
[b`00]
[[b`0H]
[b`20]
[b`15]
b380]
[b10U]
[b`0U
[b20A]
[b`4A]
[b`0U]
[b100]
[1`4`]
[1`20]
[1`0`]
[1`10]
[`rSt]
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
Restore
[`rSt] Restore
Restores the original factory calibration values. This is a simple way torecover from a mistake made while calibrating the controller.
[`rSt] This prompt always appears.
Default↓
[``no] [`yes][`rSt] [`rSt]
6.6 WATLOW Series 988LF Users Manual Factory Menus, Chapter 6
Notes
Tuning, Manual Operation, Alarms, and Error Codes, Chapter 7 WATLOW Series 988LF Users Manual 7.1
The Series 988LF can automatically tune the PID parameters to fit thecharacteristics of your particular thermal system.
Once the auto-tune sequence has begun, all PID values for both heat andcool are set to [```0] and the control goes into an on/off mode of controlat 90% of the established set point. The displayed set point remainsunchanged.
200°
Tem
per
atu
re
set point
100°
process
180°
auto-tunebegins
auto-tunecomplete
90% of set point
Auto-tuning at a set point of 200°F
Time
When the control finishes “learning” the system, it resumes standard PIDcontrol using the PID values established by the auto-tuning process.Changing the set point during an auto-tune restarts the auto-tuneprocedure.
During auto-tuning the process must cross the set point four times withinan 80-minute time span for the Series 988LF to successfully complete theauto-tune. If this does not happen within the 80-minute time limit, theSeries 988LF chooses PID values based on the 80-minute tuning cycleperformed.
To start auto-tuning:1. Press the Mode key µ to advance through the Operations menu
until the [`AUt] prompt appears in the lower display.
2. Use the Up-arrow > or Down-arrow < key to select [``On] or[`OFF].
3. Press the Display key ¥. While the control is in the tuning modethe lower display alternates every second between the normalinformation and the [tunE] prompt.
NOTE:A useful reference ontuning is Tuning ofIndustrial ControlSystems by Armando B.Corripio, published bythe Instrument Society ofAmerica.
Figure 7.1 -Auto-tuning example
çCAUTION:If a mechanical relay orcontactor is switchingpower to the load, alonger cycle time maybe desirable tominimize wear on themechanicalcomponents. Thetypical life of amechanical relay is100,000 cycles. Verifythat the cycle timeselected is appropriatefor the output devicetype. Failure to do socould result in damageto equipment and/orproperty.
7.2 WATLOW Series 988LF Users Manual Tuning, Manual Operation, Alarms, and Error Codes, Chapter 7
4. When tuning is complete, the displays return to their previous stateand [`AUt] reverts to [`OFF]. The Series 988LF installs the PID tuningparameters it has calculated and saves them in non-volatile memory.
To abort auto-tuning either reset the [`AUt] prompt to off, press the Auto/Man key å twice, or cycle power off and on. In all cases, aborting auto-tune restores all values to their state before auto-tuning began.
Manual Tuning
For optimum control performance, tune the Series 988LF to your thermalsystem. The tuning settings here are for a broad spectrum of applications;your system may have somewhat different requirements. NOTE: This is aslow procedure that may take hours to obtain optimum values.
NOTE:Tune heating outputs at a set point above the ambient process value.Tune cooling outputs at a set point below the ambient process value.
1. Apply power to the Series 988LF and enter a set point. Begin with[``Pb] set to [```1]; [``rE] or [``It] set to [`0)0]; [``rA] or[``dE] set to [`0)0]; [``Ct] set to [``%0]; [`CAL] set to [```0]; and[`AUt] set to [`OFF].
2. Proportional Band Adjustment: Gradually increase [``Pb] until theupper display process value stabilizes at a constant value. Theprocess value will not be right on set point because the initial resetvalue is 0.00 repeats per minute. (If [``Pb] is set to [```0] then[``rE], [``It], [``rA] and [``dE] are inoperative, and the Series 988functions as a simple on/off control.) The [`HYS] prompt determinesthe switching differential value.
3. Reset/Integral Adjustment: Gradually increase [``rE] or [``It] untilthe upper display process value begins to oscillate or “hunt.” Thenslowly decrease [``rE] or [``It] until the upper display stabilizesagain near set point.
4. Cycle Time Adjustment: Set [``Ct] as required. Faster cycle timessometimes achieve the best system control. However, if a mechanicalcontactor or solenoid is switching power to the load, a longer cycletime may be desirable to minimize wear on the mechanical components. Experiment until the cycle time is consistent with the quality ofcontrol you want. [``Ct] will not appear on units with a processoutput (98__-__F_-____ or 98__-___F-____).
5. Rate/Derivative Adjustment: Increase [``rA] or [``dE] to 0.10minute. Then raise set point by 20° to 30°F, or 11° to 17°C. Observethe system’s approach to the set point. If the load process value overshoots the set point, increase [``rA] or [``dE] to 0.50 minutes.
Tuning
Tuning, Manual Operation, Alarms, and Error Codes, Chapter 7 WATLOW Series 988LF Users Manual 7.3
Manual and Automatic Operation
To change from auto to manual operation, press the Auto/Man key åtwice.
Manual operation provides open-loop control of the outputs from a range of-100% to 100% output. The Series 988LF allows a negative output valueonly when [`Ot1] or [`Ot2] (Output Menu) is set to [``CL] (cool). Auto-matic operation provides closed-loop on/off or PID control. When theoperator transfers from a closed loop to an open loop, the Series 988LFretains the power level from the closed loop control. When the Series 988LFreturns to closed-loop control, it restores the previous set-point value.
The Auto/Man LED (located on the Auto/Man key å) indicates whetherthe controller is in automatic or manual operation. When the LED is lit, thecontrol is in manual operation. When the LED is off, it is in automaticoperation. When the LED flashes, press the key again within five secondsto complete the change in operation.
When a sensor opens, the controller switches from automatic to manualoperation.
• If the process has stabilized at a power level less than 75% ( ± 5%) for atwo-minute period prior to the sensor break, then the Series 988LFswitches to manual operation at the last automatic power level. If theseconditions are not met, the output goes to 0% power (output disabled).
When transferring from automatic to manual operation, the control output,or outputs, remain stable — a bumpless, or smooth, transition. Whentransferring from automatic to manual operation, the output value appearsin the lower display. In automatic operation, the set point appears.
Raise the set point by 20° to 30°F, or 11° to 17°C and watch the approach to the new set point. If you increase [``rA] or [``dE] toomuch, the approach to set point will be very sluggish. Repeat asnecessary until the system rises to the new set point without overshooting or approaching the set point too slowly.
6. Calibration Offset Adjustment: You may want your system to control toa process value other than the value coming from the input sensor. Ifso, measure the difference between that process value (perhaps atanother point in the system) and the process value showing in theupper display. Then enter the [`CAL] offset value you want. Calibration offset adds or subtracts degrees from the value of the input signal.
Tuning
7.4 WATLOW Series 988LF Users Manual Tuning, Manual Operation, Alarms, and Error Codes, Chapter 7
Using Alarms
Output 2 of the Series 988LF can function as an alarm. This is accom-plished with the [`Ot2] prompt (Setup Menu). If [``Al] is selected, theoutput is energized in the non-alarm condition and de-energizes the outputin the alarm condition. Selecting [`ALn] reverses this action: de-energizingthe output in a non-alarm condition and energizing it in an alarm condition.
If the L2 LED on the front panel is lit, this indicates an alarm condition foroutput 2.
Once you’ve configured [`Ot2] as an alarm, select the [`ALt] prompt. Atthis prompt, you can select the type of alarm: process or deviation.
A process alarm sets an absolute temperature range or process value range.When the temperature or process leaves the range an alarm occurs. Aprocess alarm is not tied to the set point.
Example: If your set point is 100°F and a process alarm high limit is set to150°F and the low limit is set to 50°F, the high limit trips at 150°F, and thelow alarm at 50°F. If you change the set point, the process alarm limitsremain the same.
A deviation alarm alerts the operator when the process strays too far fromthe set point. The operator can enter independent high and low alarmsettings. The reference for the deviation alarm is the set point. Any changein set point causes a corresponding shift in the deviation alarm. Lowalarms are usually set at a negative deviation while high alarms are apositive deviation.
Example: If your set point is 100°F, a deviation alarm high limit is set to+7°F and the low limit is set to -5°F, then the high alarm trips at 107°F, andthe low alarm at 95°F. If you change the set point to 130°F, the alarmsfollow the set point and trip at 137°F and 125°F.
Alarms can be latching or non-latching. When the alarm condition isremoved, a non-latching alarm automatically clears the alarm output andalarm message, if one is present. You must manually clear a latching alarmbefore it will disappear.
The alarm output is indicated by the corresponding LED on the front panel:L2. There may be an alarm message flashing in the lower display. When analarm message is displayed, it alternately flashes with the current prompt ata one-second interval in the lower display.
To clear a latching alarm, first correct the condition then press the Auto/Man key å once.
Alarm silencing is available with all alarms. This function overrides thealarm on initial power up. On power up, the alarm message will not appearand the L2 LED and output will reflect a non-alarm condition. Silencing isactive until the process has entered the safe region located between the low-and high-alarm settings. Then deviation outside this safe zone triggers analarm. If an alarm occurs at this point, the output can be silenced bypressing the Auto/Man key å once, but the controller still displays thealarm message.
Alarms
NOTE:An alarm display willbe masked by an errorcondition or when thecontrol is in theCalibration or Setupmenus.
Tuning, Manual Operation, Alarms, and Error Codes, Chapter 7 WATLOW Series 988LF Users Manual 7.5
Error Codes
NOTE:To view the error code,press the Auto/Man keyå once. The upperdisplay shows the errorcode for five secondsbefore returning to the[----][----][----][----][----] display.
Figure 7.5 -Error Code Display
NOTE:An alarm display will bemasked by an errorcondition or when thecontrol is in the Calibra-tion or Setup menus.
Error Code E1 and E2 MessagesFour dashes, [----], in the upper display indicate a Series 988LF error. Ifthe control was operating with stable output values (less than 75% powerand less than a 5% changeover the past 2 minutes) when the error oc-curred, it continues to operate at those levels on a percent-power basis([bplS]). If output values were not stable, or the percent output wasgreater than 75%, the control outputs drop to 0% power (off).
[E1`1] [E2`1]: A/D underflow errorThe analog-to-digital (A/D) converter of the input indicated by the firstnumber is under range. An open or reversed polarity sensor is the mostlikely cause. Check the sensor. Make sure the input prompt is set to thecorrect sensor.
TL WWA
PROCESS
L1 L2 L3 L4
DEV
% OUTDISPLAY
SERIES 988
MODE
AUTOMAN
[E1`2] [E2`2]: Sensor under-range errorThe sensor at the input indicated by the first number generated a valuelower than that allowed for the range of the sensor, or the analog-to-digital(A/D) converter malfunctioned. Make sure the setting for the input (SetupMenu) matches the sensor type and that the sensor range falls within therange of the process being controlled.
[E1`3] [E2`3]: Sensor over-range errorThe sensor at the input indicated by the first number generated a valuehigher than that allowed for the range of the sensor, or the analog-to-digital(A/D) converter malfunctioned. Make sure the setting for the input (SetupMenu) matches the sensor type and that the sensor range falls within therange of the process being controlled.
[E1`4] [E2`4]: A/D overflow errorThe analog-to-digital (A/D) converter at the input indicated by the firstnumber is over range. An open or reversed polarity sensor is the mostlikely cause. Check the sensor. Make sure the input (Setup Menu) is setto the correct sensor type.
The analog-to-digital (A/D) converter input voltage may be too high toconvert an A/D signal.
[`Er3]: Ambient temperature error
7.6 WATLOW Series 988LF Users Manual Tuning, Manual Operation, Alarms, and Error Codes, Chapter 7
Error Codes
NOTE:An alarm display will bemasked by an errorcondition or when thecontrol is in the Calibra-tion or Setup menus.
The ambient temperature of the Series 988LF has dropped below 32°F/0°Cor risen above 149°F/65°C. Calibration errors can also cause this errorcode. Try setting [`rSt] (Calibration Menu) to [`yES].
[`Er4]: RAM verification errorAn internal RAM failure has occurred. Contact the factory.
[`Er5]: Non-volatile checksum errorAn EEPROM checksum error was detected. Turn the power off then backon again. If this does not clear the error, contact the factory.
[OPLP]: Open-loop detectThis error is not available while in the on/off mode. It is only active when[OPLP] is set to [``On] (Diagnostics Menu).
[`Er9]]]]]: Configuration errorAn incorrect module has been installed in the control. Contact the factory.
Error Code Actions• All of the above error codes except [`Er4], [`Er5] and [`Er9] will
result in this condition:
• If the control was operating with stable output values (less than75% power and less than a 5% changeover the past 2 minutes)when the error occurred, it continues to operate at those levels on apercent-power basis ([bplS]). If output values were not stable, orthe percent output was greater than 75%, the control outputs dropto 0% power (off).
• To clear an error code…
• If [`Err] is set to [`nLA], the error code should clear once theproblem is corrected.
• If [`Err] is set to [`LAt], correct the problem and cycle power. Youcan also clear the error by pressing both the Up-arrow > andDown-arrow < keys to enter the Setup Menu, then press theDisplay key ¥.
• Error codes [`Er4], [`Er5] and [`Er9] will result in these conditions:
• The control is in automatic operation with both control outputs off.• The alarm outputs are in their alarm state (de-energized with the
LED lit).• The lower display is blank.• The upper display indicates the error code.• All keys are inactive.• With [`Er5], all Setup Menu prompts return to default values.
Cycle power to the control. If the error is still present contact the factory.
Tuning, Manual Operation, Alarms, and Error Codes, Chapter 7 WATLOW Series 988LF Users Manual 7.7
Notes
7.8 WATLOW Series 988LF Users Manual Tuning, Manual Operation, Alarms, and Error Codes, Chapter 7
Notes
Appendix WATLOW Series 988LF Users Manual A.1
Warranty/Returns
WarrantyThe Watlow Series 988LF is warranted to be free ofdefects in material and workmanship for 36 monthsafter delivery to the first purchaser for use, providingthat the units have not been misapplied. Since Watlowhas no control over their use, and sometimes misuse,we cannot guarantee against failure. Watlow'sobligations hereunder, at Watlow's option, are limited toreplacement, repair or refund of purchase price, andparts which upon examination prove to be defectivewithin the warranty period specified. This warrantydoes not apply to damage resulting from transportation,alteration, misuse or abuse.
Watlow ControlsWatlow Controls is a division of Watlow ElectricManufacturing Company, St. Louis, Missouri, amanufacturer of industrial electric heating productssince 1922. Watlow begins with a full set ofspecifications and completes an industrial product thatis manufactured totally in-house, in the U.S.A. Watlowproducts include electric heaters, sensors, controls andswitching devices. The Winona operation has beendesigning solid state electronic control devices since1962, and has earned the reputation as an excellentsupplier to original equipment manufacturers. TheseOEMs depend upon Watlow Controls to providecompatibly engineered controls which they canincorporate into their products with confidence. WatlowControls resides in a 100,000-square-foot marketing,engineering and manufacturing facility in Winona,Minnesota.
Returns1. Call Watlow Customer Service, (507) 454-5300, for
a Return Material Authorization (RMA) numberbefore returning any item for repair. We need thisinformation:• Ship to address • Bill to address• Contact name • Phone number• Ship via • Your P.O. number• Symptoms and/or special instructions• Name and phone number of person returning
the material.
NOTE: All unit model number stemming from thisuser’s manual end in “-INT,” which indicates a CEcompliant product.
2. Prior approval and an RMA number, from theCustomer Service Department, is needed whenreturning any unused product for credit. Make surethe RMA number is on the outside of the carton,and on all paperwork returned. Ship on a FreightPrepaid basis.
3. After we receive your return, we will examine it anddetermine the cause for your action.
4. In cases of manufacturing defect, we will enter arepair order, replacement order, or issue credit formaterial. A 20-percent restocking charge is appliedfor all returned stock controls and accessories.
5. If the unit is unrepairable, it will be returned to youwith a letter of explanation. Repair costs will notexceed 50 percent of the original cost.
Shipping ClaimsWhen you receive your Watlow control, examine thepackage for any signs of external damage it may havesustained enroute. If there is apparent damage eitheroutside the box or to its contents, make a claim with theshipper immediately. Save the original shipping cartonand packing material.
TotalCustomer
Satisfaction
Appendix
Warranty and Returns A.1
Glossary A.2
Index A.4
Specifications A.6
Model Number A.7
Menu Overview A.8
Declaration of Conformity A.9
A.2 WATLOW Series 988LF Users Manual Appendix
Glossary
annunciator — A visual display that uses pilot lights toindicate the former or existing condition of several items in asystem.
bumpless transfer — A smooth transition from auto (closedloop) to manual (open loop) operation. The control output(s)does not change during the transfer.
burst fire — A power control method that repeatedly turns onand off full AC cycles. Also called zero-cross fire, it switchesclose to the zero-voltage point of the AC sine wave. Variable-time-base burst fire selectively holds or transits AC cycles toachieve the desired power level.
calibration offset — An adjustment to eliminate the differ-ence between the indicated value and the actual processvalue.
cascade — Control algorithm in which the output of onecontrol loop provides the set point for another loop. Thesecond loop, in turn, determines the control action.
closed loop — A control system that uses a sensor to measurea process variable and makes decisions based on thatfeedback.
cold junction — See junction, cold.
cold junction compensation — Electronic means to compen-sate for the effective temperature at the cold junction.
current transformer — A transformer designed for measuringelectrical current.
dead band — The range through which a variation of theinput produces no noticeable change in the output. In thedead band, specific conditions can be placed on control outputactions. Operators select the dead band. It is usually abovethe heating proportional band and below the cooling propor-tional band.
default parameters — The programmed instructions that arepermanently stored in the microprocessor software.
derivative — The rate of change in a process variable. Alsoknown as rate. See PID.
DIN (Deutsche Industrial Norm) — A set of technical,scientific and dimensional standards developed in Germany.Many DIN standards have worldwide recognition.
DIN-a-mite — Watlow family of SCR power controls.
droop — In proportional controllers, the difference betweenset point and actual value after the system stabilizes.
duty cycle — The percentage of a cycle time in which theoutput is on.
external signal conditioner power supply — A dc voltagesource that powers external devices.
filter —digital filter (DF) — A filter that slows the response
of a system when inputs change unrealistically or too fast.Equivalent to a standard resistor-capacitor (RC) filter.
digital adaptive filter — A filter that rejects highfrequency input signal noise (noise spikes).
heat/cool output filter — A filter that slows thechange in the response of the heat or cool output. The outputresponds to a step change by going to approximately 2/3 itsfinal value within the number of scans that are set.
form A — A single-pole, single-throw relay that uses only thenormally open (NO) and common contacts. These contactsclose when the relay coil is energized. They open when poweris removed from the coil.
form B — A single-pole, single-throw relay that uses only thenormally closed (NC) and common contacts. These contactsopen when the relay coil is energized. They close when poweris removed from the coil.
form C — A single-pole, double-throw relay that uses thenormally open (NO), normally closed (NC) and commoncontacts. The operator can choose to wire for a Form A orForm B contact.
hunting — Oscillation of process temperature between the setpoint and the process variable.
hysteresis — A change in the process variable required to re-energize the control or alarm output. Sometimes calledswitching differential.
integral — Control action that automatically eliminates offset,or droop, between set point and actual process temperature.See reset, automatic.
isolation — Electrical separation of sensor from high voltagecircuitry. Allows use of grounded or ungrounded sensingelement.
JIS (Joint Industrial Standards) — A Japanese agency thatestablishes and maintains standards for equipment andcomponents. Also known as JISC (Japanese IndustrialStandards Committee), its function is similar to Germany’sDeutsche Industrial Norm (DIN).
junction — The point where two dissimilar metal conductorsjoin to form a thermocouple.
cold junction — Connection point between thermo-couple metals and the electronic instrument. See referencejunction.
grounded junction — Type of thermocouple probe inwhich the hot, or measuring junction, is an integral part of thesheath material. No electrical isolation is provided.
isolated junction — A form of thermocouple probeconstruction in which the measuring junction is fully enclosedin a protective sheath and electrically isolated from it.Commonly called an ungrounded junction.
reference junction — The junction in a thermo-couple circuit held at a stable, known temperature (coldjunction). Standard reference temperature is 32°F (0°C).
thermocouple junction — The point where the twodissimilar metal conductors join. In a typical thermocouplecircuit, there is a measuring junction and a reference junc-tion. See reference junction.
ungrounded junction — See isolated junction.
linearization, square root — The extraction of a linear signalfrom a nonlinear signal corresponding to the measured flowfrom a flow transmitter. Also called square root extraction.
Appendix WATLOW Series 988LF Users Manual A.3
NEMA 4X — A NEMA specification for determining resistanceto moisture infiltration. This rating certifies the controller aswashable and corrosion resistant.
on/off — A method of control that turns the output full onuntil set point is reached, and then off until the process errorexceeds the hysteresis.
open loop — A control system with no sensory feedback.
output — Control signal action in response to the differencebetween set point and process variable.
overshoot — The amount by which a process variable exceedsthe set point before it stabilizes.
P control — Proportioning control.
PD control — Proportioning control with derivative (rate)action.
PDR control — Proportional derivative control with manualreset, used in fast responding systems where the reset causesinstabilities. With PDR control, an operator can enter amanual reset value that eliminates droop in the system.
PI control — Proportioning control with integral (automaticreset) action.
PID — Proportional, integral, derivative. A control mode withthree functions: proportional action dampens the systemresponse, integral corrects for droop, and derivative preventsovershoot and undershoot.
process variable — The parameter that is controlled ormeasured. Typical examples are temperature, relative humid-ity, pressure, flow, fluid level, events, etc. The high processvariable is the highest value of the process range, expressed inengineering units. The low process variable is the lowest valueof the process range.
proportional band (PB) — A range in which the proportioningfunction of the control is active. Expressed in units, degrees orpercent of span. See PID.
proportional control — A control using only the P (propor-tional) value of PID control.
rate band — A range in which the rate function of a controlleris active. Expressed in multiples of the proportional band. SeePID.
ratio — A method by which the controller measures the flowof an uncontrolled variable and uses a proportion of it tocontrol the flow of a second variable.
reference junction — See junction.
reset — Control action that automatically eliminates offset, ordroop, between set point and actual process temperature. Alsosee integral.
automatic reset — The integral function of a PI orPID temperature controller that adjusts the process tempera-ture to the set point after the system stabilizes. The inverse ofintegral.
automatic power reset — A feature in latching limitcontrols that does not recognize power outage as a limitcondition. When power is restored, the output is re-energizedautomatically, as long as the temperature is within limits.
manual reset — 1) A feature on a limit control thatrequires human intervention to return the limit to normaloperation after a limit condition has occurred. 2) The adjust-ment of a proportional control to raise the proportional bandto compensate for droop.
no key reset — A method for resetting thecontroller’s memory (for instance, after an EPROM change).
resistance temperature detector (RTD) — A sensor thatuses the resistance temperature characteristic to measuretemperature. There are two basic types of RTDs: the wireRTD, which is usually made of platinum, and the thermistor,which is made of a semiconductor material. The wire RTD is apositive temperature coefficient sensor only, while thethermistor can have either a negative or positive temperaturecoefficient.
retransmit output — An analog output signal that may bescaled to represent the process value or set point value.
RTD — See resistance temperature detector.
slidewire feedback — A method of controlling the position ofa valve. It uses a potentiometer to vary resistance ( ) andindicate position of the valve.
switching sensitivity — In on/off control, the temperaturechange necessary to change the output from full on to full off.See hysteresis.
thermal system — A regulated environment that consists of aheat source, heat transfer medium or load, sensing device anda control instrument.
thermocouple (t/c) — A temperature sensing device made byjoining two dissimilar metals. This junction produces anelectrical voltage in proportion to the difference in temperaturebetween the hot junction (sensing junction) and the leadwireconnection to the instrument (cold junction).
thermocouple break protection — The ability of a control todetect a break in the thermocouple circuit and take a prede-termined action.
three-mode control — Proportioning control with integral(reset) and derivative (rate). Also see PID.
time proportioning control — A method of controlling powerby varying the on/off duty cycle of an output. This variance isproportional to the difference between the set point and theactual process temperature.
zero cross — Action that provides output switching only at ornear the zero-voltage crossing points of the AC sine wave. Seeburst fire.
zero switching — See zero cross.
Glossary
A.4 WATLOW Series 988LF Users Manual Appendix
Index
%OUT LED 3.10-5VÎ (dc) process wiring
input 1 2.7remote set point option 2.8output 1 2.9
0-10VÎ (dc) process wiringinput 1 2.7remote set point option 2.8output 1 2.9
0-20mA process wiringinput 1 2.7remote set point option 2.8output 1 2.9
0-50mV (high impedance) wiringinput 1 2.7remote set point option 2.8
1-5VÎ (dc) process wiringinput 1 2.7remote set point option 2.8output 1 2.9
4-20mA process wiringinput 1 2.7remote set point option 2.8output 1 2.9
FFactory Menus 6.1 - 6.5factory ship date 6.2feedback iiiform A A.2form B A.2form C A.2front panel 3.1front panel lockout 4.2
GGlossary A.2 - A.3ground loops 2.3
H, IInput 1 4.3input 1 wiring 2.7
0-5VÎ (dc) process 2.70-10VÎ (dc) process 2.70-20mA process 2.4, 2.70-50mV (high impedance) 2.71-5VÎ (dc) process 2.74-20mA process 2.4. 2.7RTD (2- or 3-wire) 2.7thermocouple 2.7
PP control A.3panel back access 2.2panel cutouts 2.1 - 2.2Panel Lockout Menu 4.2PD control A.3PDR control A.3PI control A.3PID control A.3power wiring 2.3process variable A.3process alarm 7.4proportional band A.3
output 1 5.2proportioning control A.3
Appendix WATLOW Series 988LF Users Manual A.5
Q, Rrange high 1 4.4 - 4.5range high 2 4.7 - 4.8range low 1 4.4 - 4.5range low 2 4.7 - 4.8rate
output 1 5.3output 2 5.4
rate band A.3reference junction A.2relay, mechanical 7.1release tabs 1.1, 2.2remote set point 4.6removing controller chassis 1.1, 2.2reset
• NEMA 4XTerminals• #6 compression universal head screws (tighten
to 5 inch/pounds maximum), accepts 20-14gauge wire.
Accuracy• Calibration accuracy and sensor conformity:
±0.1% of span, ±1 LSD, 77°F ±5°F (25°C ±3°C)ambient and rated line #voltage ±10%
• Accuracy span: 1000°F (540°C) minimum• Temperature stability: ±0.2°F/°F (0.1°C/°C)
change in ambientMechanical• 1⁄8 DIN panel mount, NEMA 4X (IP65
equivalent) front panel• Overall width x height x depth• Horizontal; 4.03" x 2.18" x 4.74", (102 mm x 55
mm x 120 mm)• Vertical; 2.18" x 4.03" x 4.74", (55 mm x 102
mm x 120 mm)• Depth behind panel; 4.06"(103 mm)• Weight less than or equal to 14.0 oz (0.40kg)Input RangeSpecified temperature ranges represent the
controller's operational span.Thermocouple(Available with basic or universal signal
conditioner)Type C2 32 to 4200°F or 0 to 2316°CType D2 32 to 4200°F or 0 to 2316°CType E -328 to 1470°F or -200 to 799°CType J 32 to 1500°F or 0 to 816°CType K -328 to 2500°F or -200 to 1371°CType N 32 to 2372°F or 0 to 1300°CType T -328 to 750°F or -200 to 399°CPt 22 32 to 2543°F or 0 to 1395°C
(1064)
(Available with universal signal conditioner)Type B 1598 to 3300°F or 870 to 1816°CType R 32 to 3200°F or 0 to 1760°CType S 32 to 3200°F or 0 to 1760°CRTD Resolution (DIN or JIS) (Avail. w/universal signal conditioner)1° (DIN) -328 to 1472°F or -200 to 800°C1° (JIS) -328 to 1166°F or -200 to 630°C0.1° (DIN and JIS)
-99.9 to 999.9°F or -73.3 to 537.7°CProcess (Available with universal signal conditioner)0-50mVÎ(dc) -999 to 9999 units0-5VÎ(dc) -999 to 9999 units1-5VÎ(dc) -999 to 9999 units0-10VÎ(dc) -999 to 9999 units0-20mAÎ(dc) -999 to 9999 units4-20mAÎ(dc) -999 to 9999 unitsOutput Options• Solid state relay, 0.5A @ 24V~ (ac) min., 253V~
(ac) max., opto isolated, burst fire. With orwithout contact suppression.
• Open collector, switched dc signal provides aminimum turn-on voltage of 3VÎ(dc) into aminimum 500 load; maximum on voltage notgreater than 32VÎ(dc) into an infinite load,isolated.
• Electromechanical relay1, Form C, 5A @ 120/240~ (ac), 6A @ 28VÎ(dc), 1/8 hp. @ 120V~ (ac)or 125VA @ 120V~ (ac). With or without contactsuppression. Off-state output impedance withRC suppression is 20k .
• Process, 0-20mA (dc), 4-20mA (dc) into 800maximum, 0-5VÎ(dc), 1-5VÎ(dc), or 0-10VÎ(dc)into 1k minimum 1, reverse acting, isolated.
1 Electromechanical relays are warranted for 100,000closures only. Solid-state switching devices arerecommended for applications requiring fast cycle times orextended service life.
2 Not an ANSI symbol.
Appendix WATLOW Series 988LF Users Manual A.7
Ordering Information–(1319)
To order, complete the code number to the right with the information below:
9 8 _ L - _ _ _ _ - A A _ _Series 988LF = Single channel 1⁄8 DIN temperature/process controller, vertical or horizontal mountHardware6 = 24-28Vı(ac/dc) vertical mounting7 = 24-28Vı(ac/dc) horizontal mounting8 = 100-240Vı(ac/dc) vertical mounting9 = 100-240Vı(ac/dc) horizontal mountingSoftwareL = Standard#1 Input1 = Basic thermocouple signal conditioner
(excludes tc types B, R, and S, RTD, Process inputs)2 = Universal signal conditioner
(All inputs included - see Range Information)#2 Input0 = None2 = Universal signal conditioner (Remote Set Point)#1 OutputB = Solid state relay, Form A, 0.5A, with RC suppressionC = Switched dc or open collector, isolatedD = Electromechanical relay1, Form C, 5A, with RC suppressionE = Electromechanical relay1, Form C, 5A,
without RC suppressionF = Universal process. 0-5VÎ(dc),
K = Solid state relay, Form A, 0.5A, without RC suppression#2 OutputA = NoneB = Solid state relay, Form A, 0.5A, with RC suppressionC = Switched dc or open collector, isolatedD = Electromechanical relay1, Form C, 5A, with RC suppressionE = Electromechanical relay1, Form C, 5A, without contact
suppressionK = Solid state relay, Form A, 0.5A, without contact suppressionDisplay/OverlayGG = Green/Green displayGR = Green/Red displayRG = Red/Green displayRR = Red/Red display
1Electromechanical relayswarranted for 100,000closures only. Solid stateswitching devices recom-mended for applicationsrequiring fast cycle timesor extended service life.
Model Number
NOTE: User documentation may be available in French, German, Spanish, Italian andDutch, as well as English. Check Watlow’s website (www.watlow.com/) for availability.Specify language at time of order.
A.8 WATLOW Series 988LF Users Manual Appendix
Figure A.8-The Series 988LF Map
NOTE:This is a completelisting of all Series988LF prompts.
Not all prompts willappear on yourcontrol. They aredependent on yourconfiguration andmodel number.
Display Loop(Lower Display)
Press µ to exitany menu andreach the DisplayLoop at any time.
To Navigate:Press ∂ to return to theDisplay Loop from anylocation and to advancethrough the Display Loop.
Press > or < to movebetween the menus.
Press µ to advancethrough a menu.
Hold µ while pressing> to move backwardsthrough the menus.
Press > or < toselect prompt values.
Fcty Factory( )
µµ
Test output
(diAg)
Software revision
Serial number
Ambient temperature
Ambient A/D count
(Diagnostics)
Factory ship date dAtE
SOFt
Sn
AMb
Acnt
gnd
cnt2
ity1
ity2
cnt1
Oty1
Oty2
dISP
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
Input 2 A/D count
Input 1 A/D count
Input 1 module
Input 2 module
Ground A/D count
Output 1 module
Output 2 module
Test displays
tout ( )
( )
Open loopOPLP ( )
Factory Menus At the Setup Menu, press > and < another3 seconds to enter the Factory Menus.
µ
Reset 1
Proportional band 1
Rate 1
Cycle time 1
Proportional band 2
Set point 2SP2
rE1
rA1
Ct1
Pb2
Pb1
rE2
db
ALO
AUt
L-r
rA2
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
Deadband
Rate 2
Alarm Lo
Auto-tune
Local-remote
Reset 2
AHI
( )
Alarm Hi
CAL Calibration offset( )
Ct2 ( ) Cycle time 2
(Operation)
OperationMenu
Press µ toadvance to theOperation Menu.
Menu Overview
(CAL)(Calibration)
A 50
t c
A 0H
A 20
A 15
A 00
A380
A 0U
A20A
b 15
b380
A10U
b10U
b 0U
b 4A
b 0U
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
b100
1 4
1 20
1 0
1 10
A 4A
b20A
rSt
A 0U
A100
b 00
b 0H
b 50
( )
( )
( )
b 20
Restore factory values
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
µ
Setup Menu Press > and < for3 seconds to enter theSetup Menu.
Range low 1
Input 1
Range high 1
RTD calibration curve
Decimal
(Setup)
LockLOC
rL1
rH1
rtd
dEC
In1
rSP
rH2
C_F
rL2
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
Range high 2
Range low 2
C or F
Remote set point
Output 1
Output 2
Alarm type
Latching
Silencing
Ot1
Ot2
LAt
ALt
SIL
( )
( )
( )
( )
( )
75 50 °F0
% OUT LED onDEV LED on Process unitsSet point or Remote set point
Erwin D. Lowell Winona, Minnesota, USAName of Authorized Representative Place of Issue
General Manager January 9, 1996Title of Authorized Representative Date of Issue
Signature of Authorized Representative
Declaration of Conformity
Series 986, 987, 988, 989
WATLOW CONTROLS1241 Bundy BoulevardWinona, Minnesota 55987 USA
Declares that the following product: EnglishDesignation: Series 986, 987, 988, 989Model Number(s): 9 8 (6, 7, 8 or 9) (Any letter) - (1 or 2) (0 1 2 3 4 or 5)
(B C D E F or K) (A B C D E F K or T) - (A B C J K MN or T) (A B C D E K R S or T) (Any two letters)
Classification: Control, Installation Category II, Polution Degree IIRated Voltage: 100 to 240V~ or 24 to 28V‡Rated Frequency: 50/60 HzRated Power Consumption: 16VA maximum
Meets the essential requirements of the following European Union Directive(s)using the relevant section(s) of the normalized standards and related documentsshown:
environmentEN 55011: 1991 Limits and methods of measurement of radio disturbance
characteristics of industrial, scientific and medical radio-frequency equipment (Group 1, Class A)
EN 61000-3-2: 1995 Limits for harmonic current emissionsEN 61000-3-3: 1995 Limitations of voltage fluctuations and flicker
73/23/EEC Low-Voltage DirectiveEN 61010-1: 1993 Safety requirements for electrical equipment for
measurement, control, and laboratory use, Part 1:General requirements
Déclare que le produit suivant : FrançaisDésignation : Série 986, 987, 988, 989Numéro(s) de modèle(s) : 98 (6, 7, 8 ou 9) (lettre quelconque) - (1 ou 2) (0, 1, 2,
3, 4 ou 5) (B, C, D, E, F ou K) (A, B, C, D, E, F, K ouT) - (A, B, C, J, K, M, N ou T) (A, B, C, D, E, K, R, S,ou T) (deux lettres quelconques)
Classification : Commande, installation catégorie II, degré depollution II
Tension nominale : 100 à 240 V ~ ou 24 à 28 V ‡Fréquence nominale : 50/60 HzConsommationd’alimentation nominale : 16 VA maximum
Conforme aux exigences de la (ou des) directive(s) suivantes de l’UnionEuropéenne figurant aux sections correspondantes des normes et documentsassociés ci-dessous :
Partie 2 : Environnement industrielEN 61000-4-2 : 1995 Décharge électrostatiqueEN 61000-4-4 : 1995 Courants électriques transitoires rapidesEN 61000-4-3: 1996 Insensibilité à l’énergie rayonnéeEN 61000-4-6: 1996 Insensibilité à l’énergie par conductionENV 50204 : 1995 Téléphone cellulaireEN 50081-2 : 1994 Norme générique sur les émissions électromagnétiques,
Partie 2 : Environnement industrielEN 55011 : 1991 Limites et méthodes de mesure des caractéristiques
d’interférences du matériel radiofréquence industriel,scientifique et médical (Groupe 1, Classe A)
EN 61000-3-2 : 1995 Limites d’émission d’harmoniquesEN 61000-3-3 : 1995 Limitations d’écarts de tension et de papillotement
73/23/EEC Directive liée aux basses tensionsEN 61010-1 : 1993 Exigences de sécurité pour le matériel électrique de
mesure, commande et de laboratoire, Partie 1 :Exigences générales
Declara que el producto siguiente: EspañolDesignación: Series 986, 987, 988, 989Números de modelo: 9 8 (6 7 8 ó 9)(Cualquier letra) - (1 ó 2)(0 1 2 3 4 ó
5)(B C D E F o K)(A B C D E F K o T) - (A B C J K MN o T)(A B C D E K R S o T)(Cualquier combinaciónde dos letras)
Clasificación: Control, categoría de instalación II, grado decontaminación ambiental II
Tensión nominal: 100 a 240 V~ o 24 a 28V ‡Frecuencia nominal: 50/60 HzConsumo nominalde energía: 16 VA máximo
Cumple con los requisitos esenciales de las siguientes directivas de la UniónEuropea, usando las secciones pertinentes de las reglas normalizadas y losdocumentos relacionados que se muestran:
89/336/EEC - Directiva de compatibilidad electromagnéticaEN 50082-2: 1995 Norma de inmunidad genérica del EMC, parte 2:
industrialEN 55011: 1991 Límites y métodos de medición de características de
perturbaciones de radio correspondientes a equipos deradiofrecuencia industriales, científicos y médicos (Grupo 1,Clase A)
EN 61000-3-2: 1995 Límites para emisiones de corriente armónicaEN 61000-3-3: 1995 Limitaciones de fluctuaciones del voltaje
73/23/EEC Directiva de baja tensiónEN 61010-1: 1993 Requerimientos de seguridad para equipos eléctricos
de medición, control y uso en laboratorios, Parte 1:Requerimientos generales
96Erklärt, daß das folgende Produkt: DeutschBeschreibung: Serie 986, 987, 988, 989Modellnummer(n): 9 8 (6 7 8 oder 9) (beliebiger Buchstabe) - (1 oder 2)
(0 1 2 3 4 oder 5) (B C D E F oder K) (A B C D E F Koder T) - (A B C J K M N oder T) (A B C D E K R Soder T) (2 beliebige Buchstaben)
Klassifikation: Regelsystem, Installationskategorie II, Emissionsgrad IINennspannung: 100 bis 240 V~ oder 24 bis 28 V‡Nennfrequenz: 50/60 HzStromverbrauch: Max. 16 VA
Erfüllt die wichtigsten Normen der folgenden Anweisung(en) der EuropäischenUnion unter Verwendung der untenstehenden einschlägigen Dokumente:
89/336/EEC Elektromagnetische ÜbereinstimmungsanweisungEN 50082-2: 1995 EMC-Rahmennorm für Störsicherheit, Teil 2: Industrielle