2018-02
18
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+
T
T
T
Multimeter
(mA)
Supply +
Supply -
24 V DC
Power
supply
I supply
Supply
Bus
1
Additionally 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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