2018-02
16
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
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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