Pepperl+Fuchs KCD2-UT2-1 Manual page 20

Functional Safety KCD2-UT2-(Ex)1, HiC2081
Operation
5.2.4 Potentiometer Input
Figure 5.4
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
– 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.
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.
20
0 % 50 % 100 %
Zone 0, 1, 2
Div. 1, 2
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
KCD2-UT2-Ex1
2
4
3
1
Fault
Supply +
Supply
Bus
Supply -
Multimeter
(mA)
5-
6+
7-
8+
24 V DC
Zone 2
Power
I supply
Div. 2
supply
1
: