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CCHHAANNNNEELLSS
INSTRUCTION MANUAL
Software Revision Card 3.2
DOCUMENT SES-KS-2402-04-07-E REV. 3
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Information and relevant technical data contained in this manual
are Copyrighted and property of SES ASA ENGINEERING S.R.L. This
manual and relevant drawings cannot be used for purpose of
manufacturing anything represented, nor disclosed to third parties
without written approval of SES ASA ENGINEERING S.R.L. SES ASA
ENGINEERING S.R.L will protect its own rights with legal means. SES
ASA ENGINEERING S.R.L reserves the right to modify specifications
and drawings without notice.
WARRANTY SES ASA ENGINEERING S.R.L guarantees all of its
products are free from manufacturing defects for a period specified
in each data sheet or agreed upon with the customer. SES ASA
ENGINEERING S.R.L will repair or replace at its workshop, free of
charge, every instrument found to be defective during the warranty
period. Technical personnel of SES ASA ENGINEERING S.R.L will
determine the cause of damage. In any case the warranty is
restricted to the cost of the instrument supplied by SES ASA
ENGINEERING S.R.L. The customer will take the responsibility for
any improper use of the instrument carried out by own or authorised
personnel.
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TABLE OF CONTENTS 1.
INTRODUCTION...................................................................................................................................
5 1.1. General
.................................................................................................................................................
5 1.2. Block
Diagram.......................................................................................................................................
6
2. SPECIFICATIONS
................................................................................................................................
7 2.1. Specifications of Board 2402 or 2404 or 2407
.....................................................................................
7 2.2. Mechanical Specifications
....................................................................................................................
7 2.2.1. Board
..............................................................................................................................................
7 2.2.2.
Rack................................................................................................................................................
7 2.3. Electrical Specifications
........................................................................................................................
8 2.3.1. Board Power Requirements
...........................................................................................................
8 2.3.2. Input Signals
...................................................................................................................................
8 2.3.3. Auxiliary OC Output Signals ( 30Vdc@0,1A max.) per each
Channel: ......................................... 8 2.3.4. Relay
Output
Signals......................................................................................................................
8 2.3.5. Analog Input
Accuracy:...................................................................................................................
8 2.4. Operating Conditions
............................................................................................................................
9
3.
INSTALLATION...................................................................................................................................
10 3.1. Handling and
Shipping........................................................................................................................
10 3.2.
Installation...........................................................................................................................................
10 3.3. Installation of Sensors with Field
Transmitter.....................................................................................
10
4. OPERATIVE
INSTRUCTIONS............................................................................................................
11 4.1. Operation
............................................................................................................................................
11 4.1.1. Connector Connections to the Field
.............................................................................................
12 4.1.2. Connection to a Sensor with 4-20 mA Transmitter or Smart
Sensor ........................................... 12 4.2. Setting
and Operation of Auxiliary
Outputs.........................................................................................
13 4.2.1. Fail to
Safe....................................................................................................................................
13 4.2.2. Operation of Alarm/Warning Auxiliary Outputs, in Flashing
or Continuous mode ....................... 13 4.3. Front Keyboard
...................................................................................................................................
14 4.3.1. Procedures Executable from the Front Panel
..............................................................................
15 4.3.2. Flow Diagram of Front Keyboard Operating
Modes.....................................................................
17 4.4. Use of Hand-Held Monitor
..................................................................................................................
19 4.4.1. Test Unit 2490
..............................................................................................................................
19 4.4.2. Channel status check
...................................................................................................................
19 4.4.3. Modification of Warning threshold
................................................................................................
20 4.4.4. Modification of Alarm threshold
....................................................................................................
21 4.4.5. Analogue Inputs
Test....................................................................................................................
22 4.5. Board Configuration
............................................................................................................................
23 4.5.1. Switch Setting
Table.....................................................................................................................
23 4.5.2. Jumper Setting Table
...................................................................................................................
23 4.5.3. Selection Card Type 2402 or 2404 or 2407
.................................................................................
23 4.5.4. Selection input Type
.....................................................................................................................
23 4.6. Typical Connections (3-wires sensor)
................................................................................................
24 4.7. Typical Connections (4-wires sensor)
................................................................................................
25
5. MAINTENANCE
..................................................................................................................................
26 5.1. General
...............................................................................................................................................
26 5.2.
Storage................................................................................................................................................
26 5.3. Self-Calibration
...................................................................................................................................
26
6.
DIAGNOSTICS....................................................................................................................................
27 6.1. Board
Diagnostics...............................................................................................................................
27 6.1.1. Diagnostics of Power Supplies and
Microprocessor....................................................................
27 6.1.2. Diagnostics of I/O Section
............................................................................................................
28 6.2. Interpretation Codes
...........................................................................................................................
28 6.2.1. Error Codes
..................................................................................................................................
28 6.3. Troubleshooting
..................................................................................................................................
29 6.4. Spare Parts
.........................................................................................................................................
31
7. CARD
LAYOUT...................................................................................................................................
32
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1. INTRODUCTION 1.1. General Control unit 2402 or 2404 or 2407,
a component of series F&G/ESD 2000, is designed for detection
of toxic or combustible gas and vapour in air, such as: LPG (Butane
/ Propane), Methane, Hydrogen, Acetylene, Ethylene, Toluene, Carbon
Monoxide, Ammonia, Hydrogen Sulphide, Oxygen, etc... . Control unit
2402 or 2404 or 2407 interfaces directly with transmitters-sensors
with 0-22 mA current output or with Smart Sensors in any
configuration, including Intrinsically Safe configuration. This
exclusive feature allows the user to connect a wide variety of two,
three or 4-wire transmitters available on the market. Using a
single chip microprocessor, present in the entire 2400 family,
gives more reliability and accuracy. The microprocessor allows the
setting of alarm set points through software commands, instead of
using potentiometers. A two-digit display indicates the detected
combustible gas LEL (lower explosive limit) on a 00-99% LEL scale
or toxic gas ppm (part per million) on a 00-99 ppm scale, or oxygen
gas on a 00-25% Volume scale, and any error codes. The indicated
concentration becomes flashing for LEL/ppm values over 99. The
operating conditions (Alarm, Warning, Ready, Fault) can also be
monitored through double LED indicators on front panel. The control
unit sends both the analogue values and the status of the two input
channels to the CPU (CPU Facility 2401) through a high-speed
redundant RS 485 serial port. A complete self diagnosis, made
possible by the microprocessor, allows supervision and control of
board components functionality, correct operation of internal power
supplies triggering, and in the case of failure activates the
relevant malfunction outputs or Watchdogs. To increase the
operational safety of the control unit, the logical section
(including microprocessor, serial interfaces and internal power
supplies) is galvanically isolated from the input/output section
from/to the field by opto-isolators. The control unit makes
available, on the connector, open collector outputs for warning,
alarm and failure, configurable through DIP switches for FLASHING
and NON-FLASHING modes. The board is fitted with a 32-pin DIN 41612
I/O connector.
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1.2. Block Diagram
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2. SPECIFICATIONS
2.1. Specifications of Board 2402 or 2404 or 2407
Application: Detection of Combustible, Toxic or Oxygen gases
(together
with a sensor with 4-20 mA transmitter or Smart Sensor)
Measure Span 2402: 0-100% LEL (lower explosive limit) Measure
Span 2404: 0-20, 0-50 or 0-100 ppm (part per million) Measure Span
2407: 0-25% Volume (depletion of Oxygen in air) N.° of Channels: 2
analogue inputs 0÷22mA Operating Environment: Safe area Warranty: 2
years of uninterrupted operation.
2.2. Mechanical Specifications 2.2.1. Board
Size: Double euro elongated 6U 19” Weight: 440 g Height: 233 mm
Length: 220 mm Front Width: 5TE
2.2.2. Rack
Size: Standard 19” 6U Weight: 2600 g Width: 19” Height: 266 mm
Depth: 283 mm
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2.3. Electrical Specifications
Power Supply: 24Vdc (nominal), 20 to 30Vdc Fuse: 24Vdc ISO line:
500mA, Retard 24Vdc I/O line: 500mA, Retard
2.3.1. Board Power Requirements
Internal consumption: 24Vdc ISO line: Quiescent : 130mA Alarm :
140mA
24Vdc I/O line: Quiescent/Alarm: 50mA
(this value does not include consumption of the sensor with
transmitter connected to the board.)
2.3.2. Input Signals Dual channel analogue signal 0÷22 mA
(single point) 2.3.3. Auxiliary OC Output Signals ( 30Vdc@0,1A
max.) per each Channel:
- Warning - Alarm - Fault - Fail to Safe for Alarm communication
failure
or Calibration (selection by DP8-SW2) 2.3.4. Relay Output
Signals Common and N.O. contact for Watchdog signal with capacity
for resistive loads:
- 0,3A @ 250Vac - 0,3A @ 125Vdc - 1A @ 30Vdc
Note: the relay is normally energised. 2.3.5. Analog Input
Accuracy:
≤ 2% FDS on input 0 to 22mA
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2.4. Operating Conditions
Operating Temperature: 0°C to + 70°C (32 to +158°F) Storage
Temperature: -40 to + 85°C (-40 to +185°F) Environment Humidity: 0%
to 95% not condensing.
2.5 Front Panel Indications For each channel: Two digits
displays (7 segments) for L.E.L. and/or error codes display
Redundant LED (red) for Alarm Redundant LED (red) for Warning
Redundant LED (yellow) for Fault Redundant LED (green) for correct
operation Ready
Common: Redundant LED (red) for serial line transmission (TX)
Redundant LED (red) for serial line reception (RX) Redundant LED
(yellow) for Watchdog (WD) active
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3. INSTALLATION
3.1. Handling and Shipping Every piece of equipment supplied by
SES ASA ENGINEERING S.R.L is packed in order to prevent physical
damage. Carefully check the contents of any package when received.
Any noticed inconsistency should be communicated to SES ASA
ENGINEERING S.R.L within ten days from material reception. SES ASA
ENGINEERING S.R.L will not be liable for any damage if this
communication is not forwarded within the indicated terms. Any
claims for damage will be communicated in writing form also to the
carrier. Any written communication must include product model and
serial number. 3.2. Installation Although 2400 modules are built to
be free from electromagnetic interference’s, they should be
installed in a place away from EMR sources such as motors, RF
equipment, etc. Connection cables must be totally shielded and have
a drain wire. The shield should be connected only to the safety
panel end. If the modules are installed in enclosed places
(cabinets), the maximum heat sink in accordance with available
space should be considered, in order to avoid excessive
overheating. A suitable ventilation system may have to be
considered. SES ASA ENGINEERING S.R.L is at your complete disposal
in supplying qualified experienced staff with the knowledge to
review the plant feasibility. 3.3. Installation of Sensors with
Field Transmitter The installation of the instruments in hazardous
areas should be carried out in accordance with local safety
regulations, technical and functional specifications of used
equipment, making reference to the technical documentation for
installation.
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4. OPERATIVE INSTRUCTIONS
4.1. Operation At start up of board 2402, 2404 or 2407 the
microprocessor inhibits outputs (Open Collectors) and displays on
the front panel so that the initial undetermined logical status’s
does not force any activation or signal in the system. The
microprocessor ‘’reads’’ the configuration status of operating mode
Dip-Switches, namely: - Card address - Activation mode (continuous
or flashing) of Open Collector outputs - Possible use of sensors
with transmitter with self calibration function - Set up of
communication speed on serial line. To set these operating modes,
please refer to section 4.5. The microprocessor verifies the data
set up by the Dip-Switches and the card is configured with new
parameters. After executing these preliminary checks, the detection
system enters a waiting status of about 70 seconds or 140 seconds,
the Ready LED of each channel starts flashing and on the display
appears the “Su” message (System in Start-up mode). This wait is
necessary to permit the field analogue line stabilisation. Then the
card starts the operating mode, and the card display shows the
detected gas concentration in % of L.E.L. (Lower Explosive Limit)
or in ppm (part per million) or in % Volume (Oxygen) of any system
or error codes (see 6.2). Open Collector outputs, front panel LED’s
and watchdog relay are enabled.
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4.1.1. Connector Connections to the Field Note: the watchdog
relay is normally energised; so, during normal operation, this
contact
will be closed (open in case of Fault). 4.1.2. Connection to a
Sensor with 4-20 mA Transmitter or Smart Sensor The board is
designed to be directly connected to both 3-wire and 4-wire 4-20 mA
transmitters. The different types of transmitters and relevant
connections are indicated in section 4.7 - Typical Connections.
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4.2. Setting and Operation of Auxiliary Outputs The card 2402 or
2404 or 2407 has eight Open Collector outputs available on the
connector:
CH1 CH2 OC1 = Alarm OC2 = Warning OC3 = Fault OC4 =
Calibration/Fail to Safe
OC5 = Alarm OC6 = Warning OC7 = Fault OC8 = Calibration/Fail to
Safe
The calibration output (O.C.) is activated by a signal from the
Smart Sensor (if this function is available) for automatic
calibration. 4.2.1. Fail to Safe In case of communication failure
between Gas input card and CPU, logic micro operates the
FAIL-TO-SAFE condition directly by local micro firmware output. In
case of Alarm, input card transmit the Alarm status to 2401-CPU
Facility Card, but if the input card don’t receive the call back
signal, that confirm the successful operation, it will activate the
O.C. dedicated to Fail to Safe (Alarm communication failure). For
the Selection of Fail-to-Safe mode see paragraph 4.5. 4.2.2.
Operation of Alarm/Warning Auxiliary Outputs, in Flashing or
Continuous mode If SW2-6 is set to ON, in case of Warning or Alarm,
O.C. outputs will be activated flashing. Alarm, Warning signals and
front panel LED’s will set to continuous pressing ACK button on the
CPU Facility. Their deactivation is conditioned to the removal of
the Alarm cause, or to pressing RESET the button on the Facility
2401, if is set the ISA-2C sequence. If SW2-6 is set to OFF, in
case of Warning or Alarm, O.C. outputs will be activated
continuously (to deactivate act as described above).
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4.3. Front Keyboard
2402%L.E.L.
ALARM
WARN
READY
FAULT
ALARM
WARN
READY
FAULT
TX
RX
WD
SEL
TESTSET
INH
2404p p m
ALARM
WARN
READY
FAULT
ALARM
WARN
READY
FAULT
SEL
TESTSET
INH
2407% O
ALARM
WARN
READY
FAULT
ALARM
WARN
READY
FAULT
SEL
TESTSET
INH
%L.E.L. p p m
2
% O 2
ALARM Indication (double red LED) - CH1 AlarmWARNING Indication
(double red LED) - CH1 WarningREADY Indication (double green LED) -
CH1 ReadyFAULT Indication (double yellow LED) - CH1 Fault
7 Segment Each Display for Value Reading on CH2
ALARM Indication (double red LED) - CH2 AlarmWARNING Indication
(double red LED) - CH2 WarningREADY Indication (double green LED) -
CH2 ReadyFAULT Indication (double yellow LED) - CH2 Fault
7 Segment Each Display for Value Reading on CH1
TX
RX
WD
TX
RX
WD
TX Indication (double red LED) of Serial Line TransmissionRX
Indication (double red LED) of Serial Line ReceiveWD Indication
(double yellow LED) of WatchDog Control (Instrument Ready)
FRONT BUTTONSSee paragraf 4.3.1 - Procedures executable from the
front panel
25 Pins, DB Connector, for Hand Held Monitor 2490.
H
H
M
H
H
H
H
MM
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4.3.1. Procedures Executable from the Front Panel These
procedures can be activated through the front panel pushbuttons: 1.
Display of Warning and Alarm set points. 2. Channel shutdown
(permanent inhibition) 3. Test. Display of warning and alarm set
points
a) Press SEL button: the first channel display will show SE
(Selection) and the READY LED will flash.
b) Press SET button: the WARNING LED will start flashing and the
display will still
indicate the Warning threshold value. c) Press SET again:
WARNING LED will turn off and ALARM LED will flash. The
display will indicate the Alarm threshold value. d) Press SEL:
the first channel READY LED will change to continuous and the
relevant display will show again the value read from LEL. The
second channel READY LED will flash and the relevant display, will
show code SE (Selected).
e) Repeat action b) and c) to see the Alarm set points. f) Press
SEL: the second channel READY LED will change to continuous and
the
relevant display will show again the value read from LEL. Note:
If the signal procedure for a channel is not completed, about 20
seconds after
the last button has been pressed the system automatically
switches to normal operating mode.
Channel shutdown (permanent inhibition)
a) Press SEL button: once to select channel 1, twice for channel
2. b) After selecting the desired channel press INH: the display
will deactivate while
the relevant READY LED will blink, confirming the channel has
been inhibited. c) Press SEL to deselect the channel; READY will
turn off too. Note: the signal Card inhibition will remain active
till the card is powered on. After a
power shut-down, the channels will return active at system
powering on.
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Restoring of Inhibited Channel
a) Select the desired channel pressing SEL. b) The relevant
READY LED will blink. c) Press INH: the display will indicate SE
(Selection) d) Press SEL: the display will indicate the LEL value
of the restored channel.
Test
Pressing TEST button, ALARM, WARNING, READY and FAULT LED’s of
both channels flash for 5 seconds to check they are working
correctly. Also the two digits display flashes with all segments.
The microprocessor also carries out a self test to check operation
of each channel directly forcing the analogue input to a pre-set
value, checking its correlation and the amount of any error, then
verifying the analogue and digital circuit of each input channel.
Any malfunction detected is signalled to the CPU Facility that will
display or print out the detected malfunction.
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4.3.2. Flow Diagram of Front Keyboard Operating Modes Cycle for
Display of Warning and Alarm Thresholds
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Cycle for Channel Inhibition
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4.4. Use of Hand-Held Monitor 4.4.1. Test Unit 2490 The H.H.M.
2490 unit allows access to some special operating modes not
accessible from the board front controls. This device, powered and
controlled by the board, is automatically configured when the
25-pin connector is inserted in the special receptacle on the front
panel. After connecting the Hand-Held Monitor the initialisation
message is displayed: SES-ASA 2402 r 3.2 (resident software
revision number) Card Address 000 (board addressing number – from 0
to 254) HAND HELD MONITOR INFO SETP RAMP
and these functions are available:
• Card address check-test • Latch/No Latch status check and
channel set-point check • Modification of Warning threshold •
Modification of Alarm threshold • Analogue inputs test
NOTE: If there is any Warning or any Alarm, the display will
show this message: SES-ASA 2402 r3.2 Card Address 000 HAND HELD
MONITOR -KEYS NOT AVAILABLE-
This message informs the operator that the H.H.M. will not
function, until the status of the channels will return to the Ready
mode. 4.4.2. Channel status check 1. From the main menu press
function key F1 (INFO). The display will show this
message: WRN LAT ALM LAT 10 no 15 no CH1 20 yes 25 yes CH2 %LEL
%LEL
This screen shows the set points of the two input channels,
reporting their LATCH/NO
LATCH status. 2. Press Enter to return to the main menu. The
menu will automatically return to main
menu after 10” of inactivity.
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4.4.3. Modification of Warning threshold 1. From the main menu
press function key F2 (SETP). The display will show this
message: SES-ASA 2402 r3.2 Card Address 000 Hand Held Monitor
WARN ALAR
2. From this menu press function key F1 (WARN). The display will
show this message: SES-ASA 2402 WARNING CH1_10 %LEL WARNING CH2 20
%LEL CH1 CH2
The underscore symbol “_” will be on the row of the selected
channel Values “10” and “20” (e.g.) are the set threshold
points.
2. Select the wanted channel pressing F1 (CH1) and F2 (CH2)
buttons. The “_” symbol
will be on the row of the selected channel. 3. Modify the
threshold value by pressing arrows “↓” and “↑”. 4. Press Enter to
return to the previous menu.
Note: If the Warning threshold is higher than the Alarm
threshold the display will show
this message:
-------------------- INPUT VALUE ERROR : DATA NOT CHANGED
--------------------
The card will ignore the new value and will maintain the old
one. This message will last for 3 sec, then the display will
automatically return to the main
menu.
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4.4.4. Modification of Alarm threshold 1. From the main menu
press function key F2 (SETP). The display will show this
message: SES-ASA 2402 r3.2 Card Address 000 Hand Held Monitor
WARN ALAR
2. From this menu press function key F2 (ALAR). The display will
show this message: SES-ASA 2402 ALARM CH1_15 %LEL ALARM CH2 25 %LEL
CH1 CH2
The underscore symbol “_” will be on the row of the selected
channel Values “15” and “25” (e.g.) are the set threshold
points.
3. Select the wanted channel by pressing F1 (CH1) and F2 (CH2)
buttons. The “_”
symbol will be on the row of the selected channel. 4. Modify the
threshold value by pressing arrows “↓” and “↑”. 5. Press Enter to
return to the previous menu.
Note: If the Alarm threshold is lower than the Warning threshold
the display will show
this message:
-------------------- INPUT VALUE ERROR : DATA NOT CHANGED
--------------------
The card will ignore the new value and will maintain the old
one. This message will last for 3”, then the display will
automatically return to the main
menu.
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4.4.5. Analogue Inputs Test This function simulates an input
signal variation in order to verify the system operation, without
interacting with the field sensor. Attention: During this test, the
field signal will not be read, because the input circuit is
under the H.H.M. influence. 1. From the main menu press function
key F4. The display will show this message: SES-ASA 2402 TEST INPUT
1_04mA TEST INPUT 2 10mA CH1 CH2
The underscore symbol “_” will be on the row of the selected
channel. Values “04mA” and “10mA” (e.g.) are the analogue value. 2.
Select the wanted channel by pressing F1 (CH1) and F2 (CH2)
buttons. The “_”
symbol will be on the row of the selected channel. 3. Modify the
analogue input current by pressing arrows “↓” and “↑”. The display
will
show the changes 4. Press Enter to return to the previous menu.
Card 2402 or 2404 or 2407 will return to
the operative condition, ignoring any previous simulated
input.
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4.5. Board Configuration 4.5.1. Switch Setting Table
SW1 Board address setting (0-254) DP1 Address with weight 1 DP2
Address with weight 2 DP3 Address with weight 4 DP4 Address with
weight 8 DP5 Address with weight 16 DP6 Address with weight 32 DP7
Address with weight 64 DP8 Address with weight 128
Note: it is not possible to configure more than one board with
the same address
SW2 DP1 See Point 4.5.3 DP2 See Point 4.5.3 DP3 ON: Insert
decimal point to display OFF: Disable decimal point to display DP4
ON: channel 2 disabled OFF: channel 2 enabled DP5 See Point 4.5.3
DP6 ON: Open Collector outputs for Warning and
Alarm in FLASHING mode OFF: Open Collector outputs for Warning
and Alarm in STEADY mode
DP7 See Point 4.5.4 DP8 ON: (O.C.4-CH1) (O.C.8-CH2) = FAIL TO
SAFE OFF: (O.C.4-CH1) (O.C.8-CH2) = CALIBRATION
4.5.2. Jumper Setting Table The card 2402 or 2404 or 2407 has
the following jumpers:
- JP1: ....................................................used
to activate RESET signal - JP2:
....................................................used to power
the serial bus 2480 -
JP1 Close: forced RESET - Open: non forced RESET JP2 Close: the
board feeds the amplification circuit of the serial bus 2480
Open: the board does not feed the amplification circuit of the
serial bus 2480 Factory setting must not be altered 4.5.3.
Selection Card Type 2402 or 2404 or 2407
SW2 DP1 DP2 DP5
ALL OFF 2402 Measure Full Scale 100 % L.E.L DP1 ON 2404 Measure
Full Scale 100 ppm DP2 ON 2404 Measure Full Scale 50 ppm DP1 &
DP2 ON 2404 Measure Full Scale 20 ppm DP5 ON 2407 Measure Full
Scale 25 % Volume
4.5.4. Selection input Type
SW2 DP7 ON (STAR-UP 140” WAIT TIME) SW2 DP7 OFF (STAR-UP 70”
WAIT TIME)
INPUT CURRENT mA
STATUS CARD MESSAGE ON DISPLAY
INPUT CURRENT mA
STATUS CARD MESSAGE ON DISPLAY
> 20,1 Over Range or > 20,1 Over Range or 3,0 ÷ 20 Measure
Range -5 ÷ 99 3,4 ÷ 20 Measure Range -3 ÷ 99 1,7 ÷ 2,9 Dirty
Optical d.o. 3,1 ÷ 3,3 Error S-600 E5 1,4 ÷ 1,6 Calibration CA 2,1
÷ 3,0 Fault -5 → E5 < 1,4 Fault E5 1,4 ÷ 2,0 Calibration CA <
1,4 Fault E5
Is under working a version with dirty optical and calibration
values, configurable by software P.S.2400, not available with this
firmware version.
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4.6. Typical Connections (3-wires sensor)
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4.7. Typical Connections (4-wires sensor)
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5. MAINTENANCE
5.1. General Module 2402 or 2404 or 2407, part of system
F&G/ESD 2000 system should be installed following the
specifications supplied, to ensure correct operation. The entire
system (sensors and electronics) should be tested at least once a
year. Checking of module 2402 or 2404 or 2407 will include these
steps:
a) Check that cables and connections are integral and in good
condition. b) Check that the system response is fully in accordance
with the cause-effect table.
5.2. Storage
a) The electronic modules should be stored in a dry room and at
temperatures within the values indicated in section 2.
b) If the modules are to be transported or stored for a long
time, they should be
contained in antistatic envelopes and packed with protective
material. 5.3. Self-Calibration This function is available only if
the transmitter has this feature. Set Dip 7 of SW 2 ON and set Dip
8 of SW2 OFF, accordingly with the calibration output current
coming from the transmitter during auto calibration routine. When
auto calibration is activated, the transmitter will send to the
card a typical current. This signal will start the calibration on
the card. On the display (relative to the calibrated channel) will
appear the “CA” message. Follow the calibration instruction
described on the manual of the transmitter.
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6. DIAGNOSTICS
Board 2402 or 2404 or 2407, designed for management of 2
analogue input channels, gives indication of each channel status
through the corresponding LED’s placed on the front panel. If Fault
LED’s do not activate, it is necessary to accurately investigate
the board circuitry to detect the exact nature of this Fault. 6.1.
Board Diagnostics Board 2402 or 2404 or 2407 has two logically
separated circuits: one is aimed to operating design function, the
other verifies the circuitry so that it is always possible to
detect and recognise any Fault. The diagnostics is carried out on
two levels: - power supply and operation of the microprocessor -
test of input circuit section. 6.1.1. Diagnostics of Power Supplies
and Microprocessor Board 2402 or 2404 or 2407, powered by two 24Vdc
sources named ISO and I/O, is provided with three DC/DC converters
dedicated to power supply of all of its sections: - logical section
(ISO) - I/O section (I/O) The following diagram shows the circuit
used to diagnose the power supply and microprocessor functions
together with the Watchdog circuit.
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6.1.2. Diagnostics of I/O Section The I/O section of board 2402
or 2404 or 2407 is continuously tested from the input terminal down
to the microprocessor. The test circuit is shown below: 6.2.
Interpretation Codes According to the function executed by the
card, the display will show these related codes: CA Channel
calibration Su The card is waiting for the analogue input signal
stabilisation 99 Flashing. Analogue input signal between 20 and
22mA Or Over range. Analogue input signal more than 22mA d.o. Dirty
Optical. Visible when DP7 of SW2 is ON, if used Infrared Gas
detectors. 6.2.1. Error Codes When the card detects the presence of
any error the channel display will show the following messages: E1
ISO power supply failure E2 24Vdc I/O power supply failure E3
Logical section failure E5 Analogue input signal less than 1mA
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6.3. Troubleshooting This information is given as a guide to
detect some of the most common operating problems. In case of
failure, personnel authorised by SES ASA ENGINEERING S.R.L must
carry out any repair. Any repair or tampering made by unauthorized
personnel will invalidate the warranty.
FAULT: Low feed voltage in I/O section.
Possible Cause:
Unsuitable, undersized or defective power supply. Too high
resistance of supply line.
Remedy: Give a power supply suitable to the system power
requirements. Use power cables with suitable cross sectional
area.
FAULT:
Low analogue input signal (from transmitter). Possible
Cause:
Connection cable interrupted or high wire resistance.
Remedy:
Replace the cable. Verify transmitter wiring with instructions
listed at ch. 4.
Possible Cause: Calibration not correct.
Remedy: Calibrate again the sensor/transmitter.
Possible Cause:
Dip-Switches for gas or sensor selection not selected correctly.
Remedy:
Re-configure Dip-Switches. Verify Switch setting with
instruction described at chapter 4.
FAULT: High analogue input signal (from transmitter).
Possible Cause:
Dip-Switches for gas or sensor selection not selected correctly.
Remedy:
Re-configure Dip-Switches. Verify Switches setting with
instruction described at chapter 4.
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FAULT:
Pushbuttons on front panel not operating. Possible Cause:
The front panel buttons can be used only if previously enabled
by the CPU Facility through relative command.
Remedy: Enable the buttons through the Facility 2401 front panel
buttons
FAULT:
Unable to calibrate correctly the sensor.
Possible Cause: Sensor or transmitter not corresponding to the
appropriate characteristics. Not correct Calibration gas.
Remedy: Replace the sensor or/and the transmitter. Use the
appropriate calibration gas kit.
FAULT:
Board not operating (Watchdog LED on front panel off). Possible
Cause:
Fault in electronics (microprocessor, internal power supply,
etc.). Remedy:
Check the protection fuses and/or replace the board.
The indications and explanations above should be considered as a
suggestion in case of failure or malfunction. Whenever the problem
cannot be solved even after following the above instructions, or it
is not listed, please contact SES ASA ENGINEERING S.R.L or their
representative.
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6.4. Spare Parts
COMPONENT serial code - Complete card 2402-034561 - Complete
card 2404-034562 - Complete card 2407-034563 - Front panel
2402-034031 - Front panel 2407-034032 - Front panel 2402-034033 -
Programmed M38002 microprocessor 2402/2404/2407-015093 - A/D
converter 574 contact SES-ASA - L602 integrated circuit contact
SES-ASA - DS2Y relay 016041 - HARTING connector mod. 906326931
026027 - JP 122 isolated amplifier (Burr Brown) Contact SES-ASA -
TLP 521/2 opto-isolator 012601
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7. CARD LAYOUT
-
SES ASA ENGINEERING S.R.L Via Carolina Romani 8/10 20091 BRESSO
(MI) ITALY
Declare Under Proper Responsibility That
PRODUCT : 2400 SERIES MODEL : 2402 Combustible Gas Card 2404
Toxic Gas Card 2407 Oxygen Gas Card
Is In Accordance With Following Directives:
EMC 89/336CEE e 92/31/CEE
EN 55011 – CEI110-6 – EN 50082-2 EN 61000-2 – EN 61000-4 IEC
1000-2 – IEC 1000-4
IEC801-2 e IEC 801-4
In Legal Representation of Manufacturer
SES ASA ENGINEERING S.R.L