P&F Barriers

1Pepperl+Fuchs Inc. Telephone (330) 425-3555 FAX (330) 425-4607E-mail: [email protected] www.am.pepperl-fuchs.com

IS Application Guide



Inside this guide, you will find common hazardous location applications involving intrinsicsafety barriers. To simplify your selection process, this guide identifies both zener diodeand galvanically isolated barrier solutions, and will help you decide which product is bestsuited to your application.

Both our SafeSnap and SafeSnapPlus zener diode barriers and our flexible K-System styleisolated barriers are highlighted. The SafeSnap zener diode barrier is our most economicalintrinsic safety barrier. Our SafeSnapPlus zener barrier features a replaceable fuse to protectthe safety components in the event of a fault condition. Galvanically isolated K-Systembarriers with removable wiring terminals combined with Power Rail compatibility offer thebest solution for process automation applications in a hazardous location.

Let Pepperl+Fuchs and its worldwide network of experts assist you in selecting intrinsicsafety barriers.

Switch Transfers ............................................................................................ 2Transmitters ................................................................................................... 6SMART Transmitters ..................................................................................... 8I/P Converters ............................................................................................. 10SMART I/P Converters ................................................................................ 12Thermocouples ........................................................................................... 14RTDs ............................................................................................................ 16Strain Gauges .............................................................................................. 18Vibration Monitoring ................................................................................... 19Potentiometers ............................................................................................ 20LED Clusters, Solenoids and Alarms ......................................................... 22Pulse Input/Serial Communication............................................................. 24Logic Controls ............................................................................................. 26Fieldbus ....................................................................................................... 28Power Supplies ........................................................................................... 30

PagePage

2 Pepperl+Fuchs Inc. Telephone (330) 425-3555 FAX (330) 425-4607E-mail: [email protected] www.am.pepperl-fuchs.com

Sw

itch

Tra

nsf

ers


Z787. Z787.H.

Z786.

SafePlus

SafePlus

Z787.Safe

Plus

SafeSnap & SafeSnapPlus Zener Barrier

Figure 1 illustrates a standard method of transferring theswitch status. The zener diode barrier in the quasi-floatingconfiguration enables a load to operate in either leg of thepower supply.

Switches andNAMUR Sensors

Figure 1 Figure 2

Intrinsic Safety Barriers


Figure 2 illustrates an alternate method of providing mutlitplechannels in a quasi-floating configuration. The first channelof the Z787. (or Z787.H. ) is used as the field power supplywhile each diode return channel is isolated from ground.

Note: SafeSnapPlus zener barriers are designed with replaceable fuses which is denoted by an F at the end of the model number. SafeSnap zener barriers have internal fuses.



Sw

itch

Tran

sfers


Isolated Barrier

The barriers shown in the following diagrams are galvanically isolated switch repeaters. These units are provided withan amplifier that transfers discrete signals (NAMUR proximity sensors/mechanical contacts) from a hazardous area toa safe area. The proximity sensor or mechanical contact will initiate a safe area control mechanism in the barrier suchas a relay contact or transistor. The following illustrations show several of the possible configurations.

LB/SCLB/SC LB

R2

R1 R1

Figure 3


Single Channel AC

Note: Lead breakage (LB) and short circuit (SC) monitoring can be selected or disabled by placingexternal resistors (R1, R2) and by positioning switches on the barrier. For LB, a 10 K resistor(R1) is used and for SC a 400 to 2 k resistor (R2) is used.

Input 2

Input 1KFA5-SOT2-Ex2 KFA6-SOT2-Ex2

R2

R1 R1

LB/SCLB/SC LB

R2

R1 R1

Figure 6

LB/SCLB/SC LB

R2

R1 R1

Figure 4

Dual Channel AC

Input 2

Input 1

LB/SCLB/SC LB

R2

R1 R1

R2

R1 R1

Figure 5


Sw

itch

Tra

nsf

ers


Isolated Barriers

Single Channel DC

Collective Error Messaging

LB/SCLB/SC LB

R2

R1 R1


LB/SCLB/SC LB

R2

R1 R1


LB/SCLB/SC LB

R2

R1 R1


LB/SCLB/SC LB

R2

R1 R1

LB/SCLB/SC LB

R2

R1 R1

Figure 7

Figure 8

Figure 9

Figure 11

Figure 10




Sw

itch

Tran

sfers


Dual Channel DC


Input 2

Input 1

LB/SCLB/SC LB

R2

R1 R1

R2

R1 R1


Input 2

Input 1

LB/SCLB/SC LB

R2

R1 R1

R2

R1 R1

Figure 12

Figure 13

Figure 17



2:1 Wire LB/SC 2:1 Wire LB/SC


Quad Channel DCFigure 14

Input 2

Input 1KFD2-SOT2-Ex2

R2

R1 R1


LB/SCLB/SC LB

R2

R1 R1

Input 2

Input 1KFD2-SOT2-Ex2.IO

R2

R1 R1

R2

R1 R1

LB/SCLB/SC LBCollective Error Messaging


Input 2

Input 1

LB/SCLB/SC LB

R2

R1R1

R2

R1R1

Figure 15

Figure 16


Transm

itte

rs IS Application Guide


This is the most common method of connecting a 2-wiretransmitter to a zener barrier. Due to the quasi-floatingconfiguration of this barrier, multiple I/O channels are notrequired to be isolated from one another.


The figure below shows the most efficient method of connecting2-wire transmitters providing the power supply for each I/Ochannel is individually isolated from one another or themeasurement load is attached to the positive leg of the supplyas shown.

SafeSnap Zener Barrier

If the I/O system requires a 1-5 V input, the Z788.R contains aprecision 250 resistor internally connected between Terminals3 and 4 to facilitate the 1-5 V output from a 4-20 mA transmitter.

Z787.Safe

Plus

Z728.Safe

Plus

Figure 1

Figure 2

Figure 3

Transmitters



Note: If additional voltage is required for the transmitter,the Z788.R.H can provide the necessary increase.The entity parameters must, however, be verified.



Transm

itters


24VDC

KFD2-STC4-Ex2 KFD2-STC4-Ex2-Y72195

24VDC

24VDC

24VDC

Isolated Transmitter Power Supply

This galvanically isolated transmitter power supply provides 3-way isolation between power, input and output for optimalsignal integrity. This intrinsic safety barrier can be used for 2 or3-wire transmitters (0/4-20 mA) and will source current to a1000 load in the safe area with an accuracy of 10 A.


This figure shows a galvanically isolated transmitter powersupply similar to Figure 5, except the safe area output sinksthe current from the I/O device.


This figure illustrates a galvanically isolated transmitter powersupply similar to Figure 5, except the safe area output is avoltage signal of 0/1-5 V (KFD2-CV-Ex1.30-305) or 0/2-10 V(KFD2-CV-Ex1.30-310).

Figure 5

Figure 6

Figure 7

Figure 4

Intrinsic Safety BarriersDual Channel IsolatedTransmitter Power Supply

This dual channel galvanically isolated transmitter power supplyprovides 3-way isolation between power, input and output foroptimal signal intergrity. This isolator powers a 2 wire tranamitterwithin a hazardous area and transfers the anlog 4-20 mA signalfrom the hazardous to the safe area.

Note: The KFD2-STC4-Ex-Y72195 has sink mode outputs


SM

AR

T T

ran

smit

ters



For bidirectional digital communication between the safe andhazardous locations, the Z787. is the most common zenerbarrier used for SMART transmitter applications. Thecommunicator can be connected as shown, however otherconfigurations are possible.

Z728.Safe

Plus

Z787.Safe

Plus

Figure 1 Figure 2

SMART Transmitters



The figure below shows an alternate method of achievingbidirectional SMART communication through a zener diodebarrier. The circuit implementing the Z728. zener barriermust be individually isolated from each I/O channel or musthave the measurement load attached to the positive leg of thesupply for proper analog/digital communication to occur.

Note: When using zener barriers with SMART I/P field devices, the over-all resistance for the loop must be considered to ensure correct operation. SafeSnapPlus zener barriers are designed with replaceable fuses which is denoted by an F at the end of the model number. SafeSnap zener barriers have internal fuses.

Note: When using zener barriers with SMART I/P field devices, the over-all resistance for the loop must be considered to ensure correct operation.SafeSnapPlus zener barriers are designed with replaceable fuses which is denoted by an F at the end of the model number. SafeSnap zener barriers have internal fuses.


SM

AR

T Tra

nsm

itters


24VDC

Isolated SMART Transmitter Power Supplies

The following illustrations identify wiring diagrams for P+Fs galvanically isolated SMART transmitter power supplies.This group of barriers provides signal isolation between the hazardous and safe areas while providing the necessary voltagefor 2-wire SMART transmitters. SMART transmitters from Enress+Hauser, Fisher-Rosemount, Foxboro, Honeywell, Smarand Yokogawa have been successfully tested with P+F isolators. It must be noted that some high frequencies used forcommunication require the KFD2-STC3-Ex1 or KFD2-STV3-Ex1 to be used since these isolators are rated for frequenciesup to 40 kHz. The transfer characteristics of these units is 0.05% of its full scale.

Figure 3

Figure 4

Figure 6

Note: Depending on calibrator design, connection can bemade across Terminals 9 and 10 in the safe area.

Note: Unit Can be configured for different outputsEx1-1 for 1-5 V outputEx1-2 for 2-10 V output


4

6

14

7

15

8

11

KFD2-STC4-Ex2 KFD2-STC4-Ex2-Y72195

24VDC

KFD2-STC4-Ex1

24VDC

14

7

15

8

11

KFD2-STC4-Ex1.20 KFD2-STC4-Ex1.20-Y72216

24VDC

Note: The KFD2-STC4-Ex2-Y72216 has sink mode outputs.

Note: The KFD2-STC4-Ex2-Y72195 has sink mode outputs

Figure 5

Figure 7


I/P

Con

vert

ers



A single channel Z728. is the most efficient methodof connecting an I/P converter if the power supply inthe controller is either isolated from other I/O channelsor has its negative return connected to the earth ground.

Z728.Safe

Plus

Z787.Safe

Plus

Figure 1 Figure 2

I/P Converters



A dual channel Z787. can be used in situations where thereturn line of the I/P cannot be connected to the earth ground.The additional diode-return channel of the Z787. providesisolation for the 4-20 mA current.


Note: In order to conserve DIN rail space, the dual channelZ779. could provide operation and protectionfor two I/P converters if the Z728. is acceptable.


I/P C

on

verte


Isolated Current Driver

The loop powered KFD0-CS-Ex1.51 barrier is galvanicallyisolated making its application very simple. Although primarilydesigned for fire detector applications where accuracy ismuch less important, it is usually accurate enough for I/Ps.The accuracy of the KFD0-CS-Ex1.51 is 200 A.

4-35 VDC

KFD0-CS-Ex1.51

Figure 4


I

Isolated Current Driver

The KFD2-SCD-Ex1.LK current driver barrier features 3-way isolation between power, input and output. The isolatoris designed to control I/P converters in a hazardous location.It also provides lead breakage and short circuit monitoring.

Figure 5

Dual Channel Isolated Current Driver

The KFD2-SCD2-Ex-2.LK is a dual channel current driverbarrier, and provides 3-way isolation between power, inputand output. The isolator is desiged to control I/P converterselectrical values and positioners in a hazardous area. It alsoprovides lead breakage and short circuit monitoring.

Figure 6


KFD2-SCD2-Ex2.LK

I

I

Isolated Current/Voltage Driver

The KFD2-CD-Ex1.32 driver barrier features high accuracy andtemperature stability. By special order both the input andoutput of this galvanically isolated barrier can be altered to suitthe application. They can be independently configured foreither voltage or current. This module provides 3-way isolationbetween power, input and output for superior signal integrity.

Figure 3

Note: A dual channel KFD0-CS-Ex2.51 can provideboth cost and space savings.


SM

AR

T I/P

Con

vert

ers



A single channel Z728. is the most efficient method ofconnecting a 2-wire SMART I/P if the power supply in thecontroller is either isolated from other I/O channels or has itsnegative return connected to the earth ground.

Z787.Safe

Plus

Z728.Safe

Plus

Figure 1 Figure 2

SMART I/P Converters



A dual channel Z787. can be used in situations where thereturn line of the SMART I/P cannot be connected to the earthground.The additional diode-return channel of the Z787.provides isolation for the 4-20 mA current and digital signal.




SM

AR

T I/P

Con

verte


I

Isolated SMART Current Driver

The KFD2-SCD-Ex1.LK SMART current driver barrier provides3-way isolation between power, input and output for optimalsignal integrity. This intrinsic safety barrier is designed tocontrol SMART I/P converters in a hazardous location. Thedigital information generated by the processing system, fielddevice or hand-held terminal is bidirectionally transferred bythe barrier.

Figure 3


Dual-Channel LsolatedSmart Current Driver

The KFD2-SCD2-Ex2.LK is a dual channel SMART currentdriver barrier, and which provides 3 way isolation betweenpower, input and output. The isolator is designed to controlSMART I/P converters,electrical valves and positioners in ahazardous area. It also provides lead breakage and shortcircuit monitoring.

Figure 4


KFD2-SCD2-Ex2.LK

I

I


Th

erm

ocou

ple

s IS Application Guide


This is most common method of connecting a thermocouple toa zener diode barrier. The dual channel configuration providesa balanced circuit with a maximum of 64 in each channel,allowing operation for any thermocouple type.

Z960.

SafePlus

Figure 1

Thermocouples




Th

erm

ocou

ple

s IS Application Guide

Isolated Thermocouple Transmitter

Figure 5

Figure 2

Intrinsic Safety BarriersIsolated Loop PoweredThermocouple Transmitter

The loop powered KFD0-TT-Ex1 barrier is galvanically isolatedand provides a 4-20 mA output for multiple thermocoupleinputs. This barrier can be configured manually for thethermocouple type and upscale or downscale burnout and isalso provided with zero and span point potentiometers.

Isolated ThermocoupleTransmitter-mA

This figure illustrates a galvanically isolated thermocoupletransmitter barrier. With its 3-way isolation between powersupply, input and output, this barrier provides accuracy andtemperature stability over the entire input range selected. Thethermocouple type, burnout condition, span, zero, taginformation and user specific data are configurable through astandard PC port and a P+F software package.

PC Interface

Figure 4

Isolated Millivolt Repeater

When an increased interference rejection or increased isolationbetween the thermocouple and measuring instrument isrequired, this galvanically isolated mV repeater can providethe necessary results. This barrier will repeat the mV signalgenerated by the thermocouple while the KFD2-VR-Ex1.50m.R and KFD2-VR-Ex1.50m.L will additionally outputa +80 mV or 80 mV signal during a burnout condition.

Figure 3

The KFD2-TT-Ex1 is galvanically isolated and provides a 0/4-20 mA output for multiple thermocouple inputs. This isolatoris configured manually for thermocouple type and upscale ordownscale burnout.


RT

Ds



This circuit shows a 3-wire RTD connected to a Z954 zenerbarrier. Due to its 3-channel configuration, the negativepower supply lead is not connected directly to ground,providing a quasi-floating system. All three channels havematched end-to-end resistance which in conjunction with thebridge measuring instrument keep errors to a minimum.

Z961.

SafePlus

Z961.

SafePlus

SafeSnap Zener Barriers

A 4-wire RTD connection with zener barriers offers the mostaccuracy. In this configuration, the measurement circuit is notsensitive to the end-to-end resistance of the barrier.

Figure 1

Figure 2

RTDs




IS Application GuideR

TD

sIntrinsic Safety Barriers

Isolated RTD Transmitter-mA

This figure illustrates a galvanically isolated RTD transmitterbarrier. With its 3-way isolation between power supply, inputand output, this barrier provides accuracy and temperaturestability over the entire input range selected. The RTD type,lead breakage condition, span, zero, tag information anduser specific data are configurable through a standard PCport and a P+F software package.

Isolated Loop PoweredRTD Transmitter

The loop powered KFD0-TR-Ex1 barrier is galvanically isolatedand provides a 4-20 mA output for 2-, 3-, or 4- wire RTDs. Thezero and span for the RTD are adjusted manually with calibrationpotentiometers located on the barrier.

Isolated RTD Repeater

When increased interference rejection or increased isolatedbetween the RTD and measuring instrument is required, thisgalvanically isolated RTD repeater can provide the necessaryresults. Depending on the required accuracy, this barrier canbe used in a 2-, 3- or 4-wire configuration. The barrier repeatsthe resistance measurement of the RTD into the safe area.

PC Interface

Figure 4

Figure 5

Figure 3



Str

ain

Gau

ges

Strain Gauges


Isolated StrainGauge Current Transmitter

This figure illustrates a galvanically isolated strain gaugetransmitter barrier. With its 3-way isolation between powersupply, input and output, this barrier provides a highlyaccurate means of supporting strain gauge applicationswithin a hazardous location. The strain gauge can beconnected in either a 4- or 6-wire configuration depending onthe required accuracy. The strain gauge excitation voltage,mV signal range, tare value and current output range are allfield selectable on the barrier.

24VDC

Figure 2

Z966.

Z964.

SafePlus

SafePlus

Z961.

SafePlus


The Z966. zener barrier supplies a 350 strain gauge bridgewith the necessary excitation voltage while the optional Z964.supplies the power supply with a voltage sense input forincreased accuracy. The millivolt signal is transferred to thesafe area through the Z961. . These barriers are connected ina quasi-floating configuration for the best possible signalintegrity when using zener barriers.

Figure 1

Note: SafeSnapPlus zener barriers are designed witha replaceable fuses which is denoted by an Fat the end of the model number. SafeSnapzener barriers have internal fuses.


IS Application GuideV

ibra

tion

Mon

itorin

g

Vibration Monitoring


Isolated Voltage Repeater

For applications where the frequency requirements areover 5 kHz, the KFD2-VR-Ex1.19-Y109129 will accept anactive voltage pulse up to +/-10V. The voltage pulse can betransmitted up to frequencies of 50 kHz.

Figure 3


This figure illustrates an example of a zener diode barrierand a vibration monitor in the hazardous area. The vibrationmonitor outputs a voltage signal, which is referenced to thepositive supply, proportional to the vibration waveform atfrequencies up to 4 kHz. Therefore, a negative polaritybarrier is required and the positive side of the power supplymust be grounded.

Figure 1

24VDC


The galvanically isolated model KFD2-VR3-Ex1.26 isdesigned specifically for use with vibration monitoringinstruments. The unit is designed with three port isolationbetween power, input and output while it provides a stablesupply for the vibration transducer. A high-input impedanceamplifier modifies the transducer signal and repeats thesignal on safe side by a second amplifier to give low-outputimpedance.

KFD2-VR-Ex1.19-Y109129

24VDC

Figure 2



Pote

nti

om

ete

rs

Potentiometers



If the accuracy of the potentiometer signal is not critical, theZ960. offers a 3-wire configuration that connects the returnline to the I.S. ground. This connection can influence themeasurement since the resistance in the negative line must betaken into account.


When a higher degree of accuracy is required on the potentiometervoltage signal, a four-wire connection is recommended. In thiscase, neither the source nor the signal is connected to the I.S.ground. This results in a high level of accuracy.

Figure 1 Figure 2


Z961.

Z961.

SafePlus

SafePlus

Z960.

SafePlus



IS Application GuideP

ote

ntio

mete

rsIntrinsic Safety Barriers

Isolated PotentiometerTransmitter-mA

These potentiometer transmitter barriers feature 3-way gal-vanic isolation between power supply, input and output for thebest signal conversion accuracy and noise immunity. Thisbarrier can be configured for either 3-, 4- or 5-wire potentiom-eters depending on the required accuracy of the application.The KFD2-PT2-Ex1-4 and KFD2-PT2-Ex1-5 are designed toprovide a safe area signal of 0-20 mA and 4-20mA respectively.

Figure 3

24VDC

KFD2-PT2-Ex1-4(5)

24VDC

5

KFD2-PT2-Ex1-(1)(2)(3)

Isolated PotentiometerTransmitter-Voltage

The KFD2-PT2-Ex1, KFD2-PT2-Ex1-1, KFD2-PT2-Ex1-2 andKFD2-PT2-Ex1-3 are similar to the unit shown in Figure 3,except the safe area output is a voltage signal of 0-10V,0-5V, 2-10V and 1-5V respectively.

Figure 4



LE

D C

lust

ers

, S

ole

noid

s an

d A

larm

s

LED Clusters, Solenoidsand Alarms


Isolated Loop PoweredDiscrete Output Driver

The loop powered KFD0-CS-Ex1.51P barrier is a galvanicallyisolated discrete output barrier. It can be used to energizecertain types of solenoids, LEDs and alarms. With a 24 Vsource, this barrier will supply approximately 27 mA at 12 Vto the hazardous area field instrument.

Note: A dual channel KFD0-CS-Ex2.51 provides both costand DIN rail space savings.

Isolated Loop PoweredSolenoid Driver

The following solenoid driver barriers provide the necessarypower to energize discrete output instruments such assolenoids, LEDs and alarms. The KFD2-SD-Ex1.48, KFD2-SD-Ex1.48-90A and KFD2-SD-Ex1.36 are internally current-limited to 35mA, 45mA and 80mA respectively.


Figure 1 illustrates the standard method of driving solenoids,LED clusters and audible/visual alarms in a hazardous location.For this configuration, the control switch must be located inthe source line for proper operation. If additional voltage isrequired for the field instrument, a Z728.H. may provide thenecessary increase.


This figure shows an alternate method of driving solenoids,LED clusters and audible/visual alarms in a hazardous locationwhen the control switch is located in the return line.

5-35 VDC

Figure 3

Figure 4

Z728.

SafePlus

Z728.H

Figure 1

Z787. Z787.H.

SafePlus

Figure 2

Note: SafeSnapPlus zener barriers are designed withreplaceable fuses which is denoted by an Fat the end of the model number. SafeSnapzener barriers have internal fuses.

Note: SafeSnapPlus zener barriers are designedwith replaceable fuses which is denotedby an F at the end of the model number.SafeSnap zener barriers have internal fuses.

4-35 VDC


IS Application GuideLE

D C

luste

rs, Sole

noid

s an

d A

larm


A

Isolated Logic InputSolenoid Driver

These solenoid driver barriers are separately powered andcan be used to energize solenoids, LEDs and alarms througha logic input: 0-2.2 V, logic 0 and 3-35 V, logic 1. The KFD2-SL-Ex1.48-90A and KFD2-SL-Ex1.36 are internally current-limited to 45mA and 80mA respectively.

Figure 5


The KFD2-SL2-Ex1 Single channel solenoid driverprovides power to a load in a hazardous area and can beswitched on or off by a signal from a logic circuit. It alsoprovides lead breakage, short circuit monitoring andcollective error messaging.

Figure 7


KFD2-SL2-Ex2 KFD2-SL2-Ex2.B

Dual-channel IsolatedLogic Input Solenoid Driver

The KFD2-SL2-Ex2 dual channel solenoid driver providespower to a load in a hazardous area and can be switched onor off by a signal from a logic circuit. It also provides leadbreakage, short circuit monitoring and collective error mes-saging.

Figure 6


KFD2-SL2-Ex1.LK


The KFD2-SL2-Ex1.LK solenoid driver provides power toa load in a hazardous area and can be switched on or offby a signal from a logic circuit. It also provides leadbreakage, short circuit monitoring and collective errormessaging and a relay contact fault output that can bewired in series for a fail-safe configuration.

Figure 8


KFD2-SL2-Ex1 KFD2-SL2-Ex1.B

Note: The KFD2-SL2-Ex1.B is the basic unit and doesnot include such features as LB/SC monitoringand collective error messaging.

Note: KFD2-SL2-Ex2.B is the basic unit and does notinclude such features as LB/SC monitoring orcollective error massaging.



Plu

se In

pu

t/S

eri

al C

om

mu

nic

ati

on

Pulse Input/SerialCommunication



The figure below illustrates an example of a zener diode barrierand an active pulse generator located in the hazardous area.The voltage pulse can be as high as 20 V since the signal isisolated from ground due to the dual channel configuration ofthe zener diode barrier.

Z787.Safe

Plus

Figure 1Figure 2

Note: SafeSnapPlus zener barriers are designed with replaceable fuses which is denotedby an F at the end of the model number.SafeSnap zener barriers have internal fuses.


This configuration can be used when the passive pulse signalgenerator requires a voltage source to operate. The pulsesare received in the safe area through the diode return channelof the barrier. These diodes may attenuate the pulse height,therefore the sensitivity of the receiving instrument must beconsidered.



ulse

Inp

ut/S

eria

l Com

mu

nic

atio

nIntrinsic Safety Barriers

Isolated Millivolt Repeater

This galvanically isolated millivolt repeater provides 3-wayisolation between the power, input and output for the bestpulse repetition. When the active pulse signal has a magni-tude of 500 mV, the KFD2-VR-Ex1.500 m will accuratelyrepeat the signal up to 1.3 kHz.

24VDC24VDC

Figure 5

24VDC24VDC

Figure 3 Figure 4

Isolated RS232 Repeater

This figure illustrates a galvanically isolated RS232 repeaterused for data transfer through a hazardous area. The figurebelow shows the signal being passed through the hazardouslocation at a maximum data transfer of 20 k bits/sec. Sincethe barrier is galvanically isolated, an intrinsic safety ground isnot necessary.


This figure shows a galvanically isolated voltage repeatersimilar to Figure 3, except the active pulse signal can have amagnitude of 10 V. Additionally, the KFD2-VR-Ex1.19 willtransmit the voltage pulse at frequencies up to 4 kHz.



Logic

Con

trols

/Lim

it A

larm

s

Logic Controls/Limit Alarms


Isolated Speed Monitoring

Often it is necessary to know if a process is operating under orover a desired speed. The KFD2-DWB-Ex1.D provides relayoutputs that energize at field-programmed setpoints.

Isolated Rotation Direction Indicatorand Synchronization Monitor

The galvanically isolated KFD2-UFT-Ex2.D comes witha display for easy on site programming and is used whena rotation direction indicator or synchronization monitoris needed. A non-display unit is available with theKFD2-UFT-Ex2. Figure 4

Figure 1

Note: For AC versions of this unit ask for our universalpower supply version the KFU8-UFT-Ex2.D or theKFU8-UFT-Ex2. Collective error messaging &power rail connection are not available on theuniversally powered units.

Note: For AC powered units ask for our universal powersupply version, the KFU8-UFC-Ex1.D or KFU8-UFC-Ex1. Collective error messaging & Power Rail connec-tions are not available on the universally powered units.

Note: For AC versions of this unit order the KFA5-DU-Ex1.D (120 VAC) or the KFA6-DU-Ex1.D (240 VAC).The AC units are not equipped with collective errormessaging or power rail connection.

Isolated UniveralFrequency Converter

The galvanically isolated KFD2-UFC-Ex1.D comes with adisplay for easy on site programming and converts thesignals from a NAMUR proximity sensor or dry contact intoa 0/4-20 mA output. For non-display version use the KFD2-UFC-Ex1.

Figure 2

Isolated TimeDelay Relay

The galvanically isolated KFD2-DU-Ex1.D comes with adisplay for easy on site programming and is commonly used inapplications requiring on delay, off-delay, one-shot or pulsatingsignal conditioning.

Figure 3

10

171618192087

13142324

Output 1

Output 2

Output 3

Output 4 0/4-20 mA

Start Up Override

Supply 24 VDC

KFD2-UFC-Ex1 KFD2-UFC-Ex1.D

Programming JackGND

TxDRxD


1

3

12

11

111012

1314

2324

3 3

11

Output 1

Output 2

Reset

Supply 24 VDC

KFD2-DU-Ex1.D

3

Hazardous Area

1


19

20

17

1618

111012

13

14

23

24

1

Output 1

Output 2

Start Up Override

Supply 24 VDC

KFD2-DWB-Ex1.D

3


Note: For AC Powered units ask for KFA5-DWB-Ex1.D (120VAC) or KFA6-DWB-Ex1.D (240 VAC). Collective errormessaging and power rail connection are not availableon the AC units.


IS Application GuideLogic

Con

trols/L

imit A

larm


Isolated Limit Alarm

The following galvanically isolated limit alarm provides twoindependent set points for RTDs, thermocouples or voltage/current signals. This intrinsic safety barrier is PC configurablefor trip point, hysteresis and high/low alarm. These modulesnot only provide the necessary isolation for intrinsic safety,but also offer a simple logic function for alarm set points.

Isolated Latching Relay

The galvanically isolated KFA5-SR2-Ex2.W.IR provideslatching functions for use as a two step controller.To maintain the levels of a process between two points, thislevel control unit can be programmed for pump-up or pump-down applications.

Figure 5

Figure 6

8

79

14

31

1

Output 1

Output 2

Supply 24 VDC

KFD2-GU-Ex1

3

Hazardous Area

2

5

4

6

15

11

10122 wire

Input for RTDs 3 wire

wire2 4

312

2

2

5

6

Input for voltage supply

Input for voltage supply

Cold junction compensation on

Input for thermocouples

0V-20 mA 4V-20 mA

0V-10V 2V-10V

Programming JackGND

TxDRxD

KFA5-SR2-Ex2.W.IR

8

7

9

14

Output 1

Output 2

Supply 120 VAC15

11

10

12

1

3

4

6

Isolated Limit Alarm

The KFD2-CRG-Ex1.D is a galanically Isolated transmitterpower supply for a 2- or 3-wire transmitter or current source.It not only repeats the 0/4-20 mA signal but has twoprogrammable relay outputs. Lead breakage and short-circuit monitoring are provide along with collective errormessaging.

Figure 7

Note: For AC powered versions of this unit,ask for our universal power version, KFU8-CRG-Ex1.D. Collective error messaging andpower rail connections are not available onthe universally powered units.

8

7

Output 1

Output 2

Supply 24 VDC

KFD2-CRG-Ex1.D

11

1012


17

16

18

23

24

0/4-20mA Output



Fie

ldbus

Figure 1

24VDC

The KLD2-PR-1.IEC fieldbus repeater can be used in generalpurpose applications with several fieldbus segments. It providesgalvanic isolation between two segments, refreshes thecommunication signal and is capable of extending the length ofa fieldbus segment.

The KLD2-PR-Ex1.IEC fieldbus repeater can be used in intrinsicsafety applications. It provides galvanic isolation between an ISand a non-IS fieldbus segment.

Figure 3

24VDC

KLD2-PR-NI1.IEC

Div 2

24VDC

KLD2-PR-Ex1.IEC

IEC 1158-2 host segment

24VDC

The KLD2-PR-Ex1.IEC fieldbus repeater can be used in ISapplications that are based on the FISCO (Fieldbus IntrinsicallySafe Concept) model.

The KLD2-PR-NI1.IEC fieldbus repeater can be used inapplications where the repeater and the isolated fieldbus segmentare located in a Div. 2 hazardous area. Since the unit providesnon-incendive, energy-limited output, Div. 2 installationrequirement and wiring methods are simplified

Figure 4

Fieldbus


Figure 2

Overview: Safe Area or Div. 2 Hazardous Area

FieldbusTerminator

HostDCS/PLC

FieldbusTerminator

FieldbusPowerSupply

IsolatedFieldbusPower

Supply/Repeaters

ISFieldbusPower

Supply/Repeaters

Isolated Fieldbus Power Supplies Repeaters

Note: Repeater has a build-in terminator on the host sideselectable terminator on field side and a switchto select powered or non-powered host.





IS Application GuideFie

ldb

usFieldbus

Host

KLD2-STR-1.24.400.IEC Fieldbus Power Supply

P+F KMDO-FT-EX Terminator

Figure 8


The figure below illustrates a zener diode barrier used toisolate a hazardous location field bus application. TheZ922 communicates at 31.25 kbts/sec (Foundationfieldbus, PROFIBUS-PA).

Fieldbus Host

24VDC 24VDC

Fieldbus Power Supply

The KLD2-STR-1.24.400.IEC is a power supply for fieldbusapplications. It features a fieldbus impedance matchingnetwork and provides a constant voltage for networkinstruments, independent of its load. It has a built inteminator on the field side.

Profibus Segment Coupler

The galvanically isolated KFD2-BR-Ex1.3PA.93 segmentcoupler used in Profibus DP/PA applications isolates theintrinsically space PROFIBUS-DP branch.

Figure 7

Fieldbus Terminator

The KMD0-FT-Ex is a fieldbus terminator. Both ends of afieldbus segment must be terminated to assure properfunction and prevent reflections. The KMD0-FT-Ex offers asimple and economical termination method for fieldbusinstallations.

Figure 6

Note: A high-speed, segment coupler with up to12 Mbaud on PROFIBUS-DP is also available.


Figure 5



Pow

er

Su

pp

lies

Power Supplies

Power Supplies

Collective Error Massaging

The collective error messaging enables lead breakage andshort circuit monitoring for Pepperl+Fuchs isolators. TheKFD2-EB2 power feed module combined with PR-05 orUPR-05 power rail allows a fault signal to be transferredalong the power rails 4th conductor to the KFD2-EB2 andprovides a relay contact output for the entire isolator group.

Redundant Power Feed Modules

When a process needs a higher degree of safety and reliability,use two KFD2-EB-R4A.B modules. If either power supply fails, thepower rail and isolators continue to be energized via the secondpower feed module.

Conventional Wiring Method

The conventional method of wiring barriers is daisy-chainingfrom barrier to barrier.

Power Rail Method

Eliminate the labor intensive daisy chain method by using PowerRail. Combined with the KFD2-EB2 power feed module and thePR-02 or UPR-02 power rail, this configuration quickly and easilydistributes power to all the barriers via 2 gold plated conductors.

Figure 1 Figure 3

Figure 2 Figure 4

Note: PR-02 is a 500 mm insert for standard 35mm DINRail. UPR-02 is sold in 2 meter lengths and comeswith its own 35 mm DIN Rail.

24VAC1112

24VDC

1112 24VDC

10

7

Fault Signal Output

1112

24VDC

10

7

Fault Signal Output

1112

24VDC

10

7

Fault Signal Output

Fault Signal

PowerDistribution

withoutPower Rail

PowerDistribution

withPower Rail

Power FeedModule

RedundantPower Feed

Modules



ow

er S

up

plie

sPower Supplies

Figure 5

Power Supply

Provide a complete solution for an isolator installation by usinga 120/240VAC to 24VDC/4A power supply. The KFA6-STR-1.24.4. It snaps quickly on to power rail to easily distributepower to the isolators.

Power Supply

The KFA6-STR-1.24.500 provides 24VDC 500 mA for thosesmall projects that do not require a large number of isolators.It snaps quickly on to Power Rail to easily distribute power tothe isolators.

Figure 6

A - Three conductors for bus connection (PR-O5 only)

B - Two conductors for power supply

C - DIN Rail

D - End Cap

E - Power Rail

C

A

BD

E

Figure 1

A - Cover

B - Two leads for power

C - Three leads for bus correction (UPR-O5 only)

D - Universal Power Rail

E - Mounting Holes

F - DIN Rail

G - End Cap UPR-E

Figure 2

G

125 mm

A

B

CD

F

E

Note: The number of isolators per power supply dependsupon the power consumption of each module.

1415 120/240VAC

4 6

32

111GND

24VDC120/240VACL1 N

Power Rail Diagrams

Note: PR-02 and PR-05 is a 500 mm insert for standard35 mm DIN rail. Individual sections can be connectedwith a VE-PR link.

Note: The UPR-02 nd UPR-05 is two meters in length andcomes with its own 35 mm DIN rail.

PR-02/PR-05 UPR-02/UPR-05

Power Supply Power Supply

Note: The number of isolators per power supply dependsupon the power consumption of each module.



Term

inal D

esi

gnati

on

Terminal Designation

Configuration

Figure 1 Figure 3

Figure 2 Figure 4

21

43

65

8 7

Please Reference AppropriateModel for Terminal Designation

7 8 9

1 2 3

13 14 1519 20 21

4 5 6

16 17 18 22 23 24

10 11 12

1 2 3 4 5 6

7 8 9

10 11 1213 14 15

1 2 3 4 5 6

7 8 9 10 11 12

13 14 15 16 17 18

19 20 21 22 23 24

1 2 3

4 5 6

7 8 9

10 11 12

13 14 15

1 2 3

4 5 6

7 8 9

10 11 12

1 2 3 4 5 6

7 8 910 11 12

P&F Barriers

Documents

safesnap zener diode

zener diodeand

intrinsicsafety barriers

isolated barrier solutions

30pagepage2 pepperl

application guidez787

application guideinside

system styleisolated