Pepperl+Fuchs KCD2-UT2-1 User manual

ISO9001
2
Functional Safety
Temperature Converter
KCD2-UT2-(Ex)1, HiC2081
PROCESS AUTOMATION
MANUAL

With regard to the supply of products, the current issue of the following document is applicable: The General Terms of
Delivery for Products and Services of the Electrical Industry, published by the Central Association of the Electrical
Industry (Zentralverband Elektrotechnik und Elektroindustrie (ZVEI) e.V.) in its most recent version as well as the
supplementary clause: "Expanded reservation of proprietorship"
Functional Safety KCD2-UT2-(Ex)1, HiC2081

Functional Safety KCD2-UT2-(Ex)1, HiC2081
Content
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1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Content of this Document. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Product Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Standards and Directives for Functional Safety . . . . . . . . . . . . . . . . . . 8
3 Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 System Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Safety Function and Safe State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.4 Characteristic Safety Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.5 Useful Life Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 Mounting and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1 Proof Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2 Proof Test Procedure for KCD2-UT2-(Ex)1 . . . . . . . . . . . . . . . . . . . . . 15
5.3 Proof Test Procedure for HiC2081 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6 Maintenance and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7 List of Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

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Functional Safety KCD2-UT2-(Ex)1, HiC2081
Introduction
1Introduction
1.1 Content of this Document
This document contains information for usage of the device in functional safety-related
applications. You need this information to use your product throughout the applicable stages of
the product life cycle. These can include the following:
• Product identification
• Delivery, transport, and storage
• Mounting and installation
• Commissioning and operation
• Maintenance and repair
• Troubleshooting
• Dismounting
• Disposal
The documentation consists of the following parts:
• Present document
• Instruction manual
•Manual
•Datasheet
Additionally, the following parts may belong to the documentation, if applicable:
• EU-type examination certificate
• EU declaration of conformity
• Attestation of conformity
• Certificates
• Control drawings
• FMEDA report
• Assessment report
• Additional documents
For more information about Pepperl+Fuchs products with functional safety, see www.pepperl-
fuchs.com/sil.
Note!
This document does not substitute the instruction manual.
Note!
For full information on the product, refer to the instruction manual and further documentation
on the Internet at www.pepperl-fuchs.com.

Functional Safety KCD2-UT2-(Ex)1, HiC2081
Introduction
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1.2 Safety Information
Target Group, Personnel
Responsibility for planning, assembly, commissioning, operation, maintenance, and
dismounting lies with the plant operator.
Only appropriately trained and qualified personnel may carry out mounting, installation,
commissioning, operation, maintenance, and dismounting of the product. The personnel must
have read and understood the instruction manual and the further documentation.
Intended Use
The device is only approved for appropriate and intended use. Ignoring these instructions will
void any warranty and absolve the manufacturer from any liability.
The device is developed, manufactured and tested according to the relevant safety standards.
Use the device only
• for the application described
• with specified environmental conditions
• with devices that are suitable for this safety application
Improper Use
Protection of the personnel and the plant is not ensured if the device is not used according to
its intended use.

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Functional Safety KCD2-UT2-(Ex)1, HiC2081
Introduction
1.3 Symbols Used
This document contains symbols for the identification of warning messages and of informative
messages.
Warning Messages
You will find warning messages, whenever dangers may arise from your actions. It is
mandatory that you observe these warning messages for your personal safety and in order to
avoid property damage.
Depending on the risk level, the warning messages are displayed in descending order as
follows:
Informative Symbols
Action
This symbol indicates a paragraph with instructions. You are prompted to perform an action or
a sequence of actions.
Danger!
This symbol indicates an imminent danger.
Non-observance will result in personal injury or death.
Warning!
This symbol indicates a possible fault or danger.
Non-observance may cause personal injury or serious property damage.
Caution!
This symbol indicates a possible fault.
Non-observance could interrupt the device and any connected systems and plants, or result
in their complete failure.
Note!
This symbol brings important information to your attention.

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Product Description
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2 Product Description
2.1 Function
KCD2-UT2-1
This signal conditioner provides the galvanic isolation between field circuits and control
circuits.
The device converts RTD input signals or thermocouple input signals on the field side to
0/4 mA ... 20mA signals on the control side.
The removable terminal block KC-CJC-** is available for thermocouples when internal cold
junction compensation is desired.
A fault is indicated by an LED and by user-configured fault indication outputs.
If the device is operated via Power Rail, additionally a collective error message is available.
The device is easily configured by the use of the PACTware configuration software.
The device is mounted on a 35 mm DIN mounting rail according to EN 60715.
KCD2-UT2-Ex1
This isolated barrier is used for intrinsic safety applications.
The device converts RTD input signals or thermocouple input signals in the hazardous area to
0/4 mA ... 20mA signals in the safe area.
The removable terminal block KC-CJC-** is available for thermocouples when internal cold
junction compensation is desired.
A fault is indicated by an LED and by user-configured fault indication outputs.
If the device is operated via Power Rail, additionally a collective error message is available.
The device is easily configured by the use of the PACTware configuration software.
The device is mounted on a 35 mm DIN mounting rail according to EN 60715.
HiC2081
This isolated barrier is used for intrinsic safety applications.
This device accepts thermocouples (TC), millivolts, potentiometers, or resistance temperature
detectors (RTD) from a hazardous area and converts them to an isolated, linearized analog
output in the safe area.
The output can be selected as a current source or current sink with a switch.
Line fault detection of the field circuit is indicated by a red LED and an output on the fault bus.
The fault conditions are monitored via a Fault Indication Board.
The device is easily configured by the use of the PACTware configuration software.
This device mounts on a HiC Termination Board.

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Functional Safety KCD2-UT2-(Ex)1, HiC2081
Product Description
2.2 Interfaces
The device has the following interfaces.
• Safety relevant interfaces: input, output
• Non-safety relevant interfaces: programming socket, collective error message output
2.3 Marking
2.4 Standards and Directives for Functional Safety
Device-specific standards and directives
System-specific standards and directives
Note!
For corresponding connections see datasheet.
Pepperl+Fuchs GmbH
Lilienthalstraße 200, 68307 Mannheim, Germany
Internet: www.pepperl-fuchs.com
KCD2-UT2-1, KCD2-UT2-Ex1, HiC2081 Up to SIL 2
Functional safety IEC/EN 61508, part 2, edition 2010:
Functional safety of electrical/electronic/programmable electronic
safety-related systems (manufacturer)
Functional safety IEC/EN 61511, part 1 –3, edition 2003:
Functional safety –Safety instrumented systems for the process
industry sector (user)

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Planning
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3 Planning
3.1 System Structure
3.1.1 Low Demand Mode of Operation
If there are two control loops, one for the standard operation and another one for the functional
safety, then usually the demand rate for the safety loop is assumed to be less than once per
year.
The relevant safety parameters to be verified are:
•thePFD
avg value (average Probability of dangerous Failure on Demand) and the T1
value (proof test interval that has a direct impact on the PFDavg value)
• the SFF value (Safe Failure Fraction)
• the HFT architecture (Hardware Fault Tolerance)
3.1.2 High Demand or Continuous Mode of Operation
If there is only one safety loop, which combines the standard operation and safety-related
operation, then usually the demand rate for this safety loop is assumed to be higher than once
per year.
The relevant safety parameters to be verified are:
•thePFHvalue(Probability of dangerous Failure per Hour)
• Fault reaction time of the safety system
• the SFF value (Safe Failure Fraction)
• the HFT architecture (Hardware Fault Tolerance)
3.1.3 Safe Failure Fraction
The safe failure fraction describes the ratio of all safe failures and dangerous detected failures
to the total failure rate.
SFF = (s+ dd) / (s+ dd + du)
A safe failure fraction as defined in IEC/EN 61508 is only relevant for elements or (sub)systems
in a complete safety loop. The device under consideration is always part of a safety loop but is
not regarded as a complete element or subsystem.
For calculating the SIL of a safety loop it is necessary to evaluate the safe failure fraction of
elements, subsystems and the complete system, but not of a single device.
Nevertheless the SFF of the device is given in this document for reference.

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Functional Safety KCD2-UT2-(Ex)1, HiC2081
Planning
3.2 Assumptions
The following assumptions have been made during the FMEDA:
• Failure rate based on the Siemens standard SN29500.
• Failure rates are constant, wear is not considered.
• Failures during configuration are not considered.
• The collective error message output is not considered in the FMEDA and in the
calculations.
• Propagation of failures is not relevant.
• External power supply failure rates are not included.
• The collective error message output is not safety relevant.
• The indication of a dangerous failure (via fault bus) is detected within 1 hour by the
programmable logic controller (PLC).
• The safety-related device is considered to be of type Bdevice with a hardware fault
tolerance of 0.
• The device will be used under average industrial ambient conditions comparable to the
classification "stationary mounted" according to MIL-HDBK-217F.
Alternatively, operating stress conditions typical of an industrial field environment similar to
IEC/EN 60654-1 Class C with an average temperature over a long period of time of 40 ºC
may be assumed. For a higher average temperature of 60 ºC, the failure rates must be
multiplied by a factor of 2.5 based on experience. A similar factor must be used if frequent
temperature fluctuations are expected.
• The application program in the programmable logic controller (PLC) is configured to detect
underrange and overrange failures. These failures have been classified as dangerous
detected failures.
SIL 2 Application
• The device shall claim less than 10 % of the total failure budget for a SIL 2 safety loop.
• For a SIL 2 application operating in low demand mode the total PFDavg value of the SIF
(Safety Instrumented Function) should be smaller than 10-2, hence the maximum
allowable PFDavg value would then be 10-3.
• For a SIL 2 application operating in high demand mode the total PFH value of the SIF
should be smaller than 10-6 per hour, hence the maximum allowable PFH value would then
be 10-7 per hour.
• The IEC/EN 61511-1 section 11.4.4 allows devices to be used in applications one SIL
higher than given by table 3 of IEC/EN 61508-2, if the device is proven-in-use. The
assessment and proven-in-use demonstration lead to the result that the device may be
used in applications up to SIL 2. However, it is the responsibility of the end-user to decide
on applying proven-in-use devices.

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Planning
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3.3 Safety Function and Safe State
Safety Function
The safety function of the device is fulfilled, as long as the output repeats the linearized input
signal with a tolerance of 2 %.
Safe State
The safe state is present when the output signal is < 4 mA or > 20 mA.
Reaction Time
• for temperature input: < 1.5 s
• for potentiometer input: < 3 s
Note!
See corresponding datasheets for further information.

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Functional Safety KCD2-UT2-(Ex)1, HiC2081
Planning
3.4 Characteristic Safety Values
The characteristic safety values like PFD, PFH, SFF, HFT and T1are taken from the
FMEDA report. Observe that PFD and T1are related to each other.
The function of the devices has to be checked within the proof test interval (T1).
Parameters Characteristic values
Assessment type FMEDA report with proven-in-use assessment 1
1For the proven-in-use demonstration, sales figures, customer returns and questionnaires filled out by customers were used which
show that no unknown systematic faults are expected. The device is based on a former device that was evaluated for
a proven-in-use statement by exida.com GmbH.
Device type B
Mode of operation Low demand mode or high demand mode
HFT 0
SIL (SC) 2
Safety function Transfer of analog signal
s2
2For transfer from the FMEDA report the following rules apply: "Annunciation failures" have no direct influence on the safety function
and are therefore counted as "No effect failures". "No effect failures" are not influencing the safety function and are therefore not
included in SFF and in the failure rates of the safety function.
20.1 FIT
dd 293 FIT
du 69 FIT
no part 27.6 FIT
total (safety function)2382 FIT
SFF 281,8 %
PTC 90 %
MTBF 3
3acc. to SN29500. This value includes failures which are not part of the safety function/MTTR = 8 h. The value is calculated for one
safety function of the device.
162 years
PFH 16.93 x 10-8 1/h
PFDavg for T1= 1 year 4
4Since the current PTC value is < 100 % and therefore the probability of failure will increase, calculate the PFD value according to the
following formula:
PFDavg = (du / 2) x (PTC x T1+ (1 –PTC) x Tservice)
A service time Tservice of 10 years was assumed for the calculation of PFDavg.
5.79 x 10-4 1/h
PFDavg for T1= 2 years 48.52 x 10-4 1/h
Reaction time 5
5Time between fault detection and fault reaction
• for temperature input: < 1.5 s
• for potentiometer input: < 3 s
Table 3.1

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Planning
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3.5 Useful Life Time
Although a constant failure rate is assumed by the probabilistic estimation this only applies
provided that the useful lifetime of components is not exceeded. Beyond this useful lifetime,
the result of the probabilistic estimation is meaningless as the probability of failure significantly
increases with time. The useful lifetime is highly dependent on the component itself and its
operating conditions –temperature in particular. For example, the electrolytic capacitors can
be very sensitive to the operating temperature.
This assumption of a constant failure rate is based on the bathtub curve, which shows the
typical behavior for electronic components.
Therefore it is obvious that failure calculation is only valid for components that have this
constant domain and that the validity of the calculation is limited to the useful lifetime of each
component.
It is assumed that early failures are detected to a huge percentage during the installation and
therefore the assumption of a constant failure rate during the useful lifetime is valid.
However, according to IEC/EN 61508-2, a useful lifetime, based on general experience,
should be assumed. Experience has shown that the useful lifetime often lies within a range
period of about 8 to 12 years.
As noted in DIN EN 61508-2:2011 note N3, appropriate measures taken by the manufacturer
and plant operator can extend the useful lifetime.
Our experience has shown that the useful lifetime of a Pepperl+Fuchs product can be higher if
the ambient conditions support a long life time, for example if the ambient temperature is
significantly below 60 °C.
Please note that the useful lifetime refers to the (constant) failure rate of the device. The
effective life time can be higher.

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Functional Safety KCD2-UT2-(Ex)1, HiC2081
Mounting and Installation
4 Mounting and Installation
Mounting and Installing the Device
1. Observe the safety instructions in the instruction manual.
2. Observe the information in the manual.
3. Observe the requirements for the safety loop.
4. Protect the device against manipulation. Mount the device in a lockable switch cabinet, for
example.
5. Connect the device only to devices that are suitable for this safety application.
6. Check the safety function to ensure the expected output behavior.
4.1 Configuration
Configuring the Device via PACTware Operating Software
The device can also be configured via the PACTware operating software. The interface for
connecting a personal computer for configuring is on the front of the device.
1. Open the cover.
2. Connect a personal computer via the K-ADP-USB adapter to the device.
3. Configure the device for the required safety function via the PACTware operating software,
see chapter 4.1.1.
4. Protect the device configuration by a password against changing.
5. Leave the parameterization mode to prevent unintentional adjustments.
6. Disconnect the personal computer from the device.
7. Close the cover.
8. Check the device configuration to ensure the expected output behavior.
9. Document any changes to the device configuration.
4.1.1 Configuration for Use in Safety Function
Configuring the Device for Use in Safety Function
1. Configure the device for the required safety function via the operating software.
2. Disable the simulation function.
3. Enable the short circuit (SC) detection and lead breakage (LB) detection.
4. Disable the fault indication function > Hold.
5. Set the characteristic of the current output to the 4 mA to 20 mA NE 43 mode.
6. Protect the device configuration by a password against changing.
Note!
For more information see the manual.
Note!
For more information see the manual.

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Operation
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5Operation
Operating the device
1. Observe the safety instructions in the instruction manual.
2. Observe the information in the manual.
3. Use the device only with devices that are suitable for this safety application.
4. Correct any occurring safe failures within 8 hours. Take measures to maintain the safety
function while the device is being repaired.
5.1 Proof Test
According to IEC/EN 61508-2 a recurring proof test shall be undertaken to reveal potential
dangerous failures that are not detected otherwise.
Check the function of the subsystem at periodic intervals depending on the applied PFDavg in
accordance with the characteristic safety values. See chapter 3.4.
It is under the responsibility of the plant operator to define the type of proof test and the interval
time period.
The following sections describe the steps of the proof test. The proof test reveals almost all
possible dangerous faults (diagnostic coverage > 90 %).
Check the settings after the configuration by suitable tests.
5.2 Proof Test Procedure for KCD2-UT2-(Ex)1
Perform the proof test with the same configuration that you use in the application. Substitute
the sensor with a sensor simulator or a calibrator.
Check the safety function at the input, which must be configured to set the output values to
4 mA, 12 mA, 20 mA.
Equipment required:
• Digital multimeter with an accuracy of 0.1 %
Use for the proof test of the intrinsic safety side of the device a special digital multimeter for
intrinsically safe circuits.
If intrinsically safe circuits are operated with non-intrinsically safe circuits, they must no
longer be used as intrinsically safe circuits.
• TC simulator, RTD simulator, voltage source or resistor
Danger!
Danger to life from missing safety function
If the safety loop is put out of service, the safety function is no longer guaranteed.
• Do not deactivate the device.
• Do not bypass the safety function.
• Do not repair, modify, or manipulate the device.

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Functional Safety KCD2-UT2-(Ex)1, HiC2081
Operation
5.2.1 Thermocouple Input (TC)
Figure 5.1 Proof test set-up for KCD2-UT2-(Ex)1 with thermocouple input (TC)
Usage in Zone 0, 1, 2/Div. 1, 2 only for KCD2-UT2-Ex1
Proof Test Procedure for the Thermocouple Input
Additional equipment: 110 fixed resistor (accuracy of 0.1 %)
1. Connect a TC simulator to the terminals 1 and 2.
2. Connect the digital multimeter to the terminals 5 and 6.
3. Set the compensation/reference temperature on the TC simulator to 26 °C.
4. Connect the fixed resistor to terminals 3 and 4.
5. Set the TC simulator sequentially to the temperature values
representing 4 mA, 12 mA, 20 mA at the output.
6. Measure the output current.
The proof test is passed if the following values are measured at the output 1:
–for the 4 mA application: 3,7 mA to 4,3 mA
–for the 12 mA application: 11,7 mA to 12,3 mA
–for the 20 mA application: 19.7 mA to 20.3 mA
7. Remove the TC simulator. Check if a lead breakage is detected.
The red LED is flashing. The output behavior in the event of a fault depends on the
device configuration.
8. Remove the fixed resistor. Check if a lead breakage of the cold junction compensation is
detected.
The red LED is flashing. The output behavior in the event of a fault depends on the
device configuration.
Zone 0, 1, 2
Div. 1, 2
Zone 2
Div. 2
Fault
KCD2-UT2-Ex1
4
3
2
1
5-
6+
7-
8+
110 Ω
TC
Sim.
+
-
Multimeter
(mA)
Supply +
Supply -
24 V DC
Power
supply
I supply
Supply
Bus
1Additionally the loop diagnosis shall be tested to prove that the fault signalling via the current output is working
correctly. The output current in the event of a failure depends on the device configuration. Please record this
configuration and the resulting expected fault signalling current in the test report. Example: if downscale is
configured, 2.0 mA ±1 % must be measured in the event of a failure. The red LED must be flashing.

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Operation
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9. Apply a short circuit between terminal 3 and 4. Check if a short circuit of the cold junction
compensation is detected.
The red LED is flashing. The output behavior in the event of a fault depends on the
device configuration.
10. Set the device back to the original settings after the test.
Proof Test for external Cold Junction Compensation
You can also use this proof test if you are using an external cold junction compensation. In this
case set the preset compensation/reference temperature on the TC simulator, see step 3.

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Functional Safety KCD2-UT2-(Ex)1, HiC2081
Operation
5.2.2 Resistance Thermometer Input (RTD)
Figure 5.2 Proof test set-up for KCD2-UT2-(Ex)1 with resistance thermometer input (RTD)
Usage in Zone 0, 1, 2/Div. 1, 2 only for KCD2-UT2-Ex1
Proof Test Procedure for Resistance Thermometer Input
1. Connect a RTD simulator, depending on the application.
• for 4-wire connection: terminals 1, 2, 3 and 4
• for 3-wire connection: terminals 2, 3 and 4
• for 2-wire connections: terminals 3 and 4
2. Connect the digital multimeter to the terminals 5 and 6.
3. Set the RTD simulator sequentially to the temperature values
representing 4 mA, 12 mA, 20 mA at the output.
4. Measure the output current.
The proof test is passed if the following values are measured at the output 1:
–for the 4 mA application: 3,7 mA to 4,3 mA
–for the 12 mA application: 11,7 mA to 12,3 mA
–for the 20 mA application: 19.7 mA to 20.3 mA
5. Apply a short circuit between terminal 3 and 4. Do not remove the RTD simulator. Check if
a short circuit of the cold junction compensation is detected.
The red LED is flashing. The output behavior in the event of a fault depends on the
device configuration.
6. Remove the RTD simulator. Check if a lead breakage is detected.
The red LED is flashing. The output behavior in the event of a fault depends on the
device configuration.
7. Set the device back to the original settings after the test.
Zone 0, 1, 2
Div. 1, 2
Zone 2
Div. 2
Fault
KCD2-UT2-Ex1
4
3
2
1
5-
6+
7-
8+
TT
T
Multimeter
(mA)
Supply +
Supply -
24 V DC
Power
supply
I supply
Supply
Bus
1Additionally the loop diagnosis shall be tested to prove that the fault signalling via the current output is working
correctly. The output current in the event of a failure depends on the device configuration. Please record this
configuration and the resulting expected fault signalling current in the test report. Example: if downscale is
configured, 2.0 mA ±1 % must be measured in the event of a failure. The red LED must be flashing.

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Operation
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5.2.3 Voltage Input (mV)
Figure 5.3 Proof test set-up for KCD2-UT2-(Ex)1 with voltage input (mV)
Usage in Zone 0, 1, 2/Div. 1, 2 only for KCD2-UT2-Ex1
Proof Test Procedure for the Voltage Input
1. Connect a voltage source to the terminals 1 and 2.
2. Connect the digital multimeter to the terminals 5 and 6.
3. Set the voltage source sequentially to the voltage values
representing 4 mA, 12 mA, 20 mA at the output.
4. Measure the output current.
The proof test is passed if the following values are measured at the output 1:
–for the 4 mA application: 3,7 mA to 4,3 mA
–for the 12 mA application: 11,7 mA to 12,3 mA
–for the 20 mA application: 19.7 mA to 20.3 mA
5. Remove the voltage source. Check if a lead breakage is detected.
The red LED is flashing. The output behavior in the event of a fault depends on the
device configuration.
6. Set the device back to the original settings after the test.
Zone 0, 1, 2
Div. 1, 2
Zone 2
Div. 2
Fault
KCD2-UT2-Ex1
4
3
2
1
5-
6+
7-
8+
Multimeter
(mA)
mV
-
+
Supply +
Supply -
24 V DC
Power
supply
I supply
Supply
Bus
1Additionally the loop diagnosis shall be tested to prove that the fault signalling via the current output is working
correctly. The output current in the event of a failure depends on the device configuration. Please record this
configuration and the resulting expected fault signalling current in the test report. Example: if downscale is
configured, 2.0 mA ±1 % must be measured in the event of a failure. The red LED must be flashing.

2018-02
20
Functional Safety KCD2-UT2-(Ex)1, HiC2081
Operation
5.2.4 Potentiometer Input
Figure 5.4 Proof test set-up for KCD2-UT2-(Ex)1 with potentiometer input
Usage in Zone 0, 1, 2/Div. 1, 2 only for KCD2-UT2-Ex1
Proof Test Procedure for the Potentiometer Input
The resistor values which are used to simulate the potentiometer shall be chosen so that they
represent the full scale value of the potentiometer when connected in series. The individual
resistors shall be of the same resistance value and have an accuracy of 1 %.
1. Connect the series resistors for 0 %, 50 % and 100 % of the potentiometer value to the
terminals 2, 3 and 4, see figure.
2. Connect the digital multimeter to the terminals 5 and 6.
3. Measure the output current.
The proof test is passed if the following values are measured at the output 1:
–for 0 % of the potentiometer value: 3.7 mA to 4.3 mA
–for 50 % of the potentiometer value: 11.7 mA to 12.3 mA
–for 100 % of the potentiometer value: 19.7 mA to 20.3 mA
4. Remove the series resistors.
5. Set the device back to the original settings after the test.
Zone 0, 1, 2
Div. 1, 2
Zone 2
Div. 2
Fault
KCD2-UT2-Ex1
4
3
2
1
5-
6+
7-
8+
0 % 50 % 100 %
Multimeter
(mA)
Supply +
Supply -
24 V DC
Power
supply
I supply
Supply
Bus
1Additionally the loop diagnosis shall be tested to prove that the fault signalling via the current output is working
correctly. The output current in the event of a failure depends on the device configuration. Please record this
configuration and the resulting expected fault signalling current in the test report. Example: if downscale is
configured, 2.0 mA ±1 % must be measured in the event of a failure. The red LED must be flashing.