2017-12
18
Functional Safety KF**-CRG2-(Ex)1.D
Operation
Proof Test Procedure for the Current Output
1. Connect a digital multimeter and the load defined by the application to
terminals 7- and 8+.
2. Set the input current to 4 mA, 12 mA, and 20 mA, depending on the used
configuration.
Measure the output current and the relay function.
The Proof test for the current output is passed if the measured output
values are:
– for 4 mA application: 3.9 mA to 4.1 mA
– for 12 mA application: 11.9 mA to 12.1 mA
– for 20 mA application: 19.9 mA to 20.1 mA
3. Set the input current to 20 mA.
Measure the input voltage on terminals 1+ and 3-.
The proof test for the current output is passed if the measured input
voltage is 15 V.
4. If the line fault detection is activated, remove the current source on terminals
1+ and 3-.
The red LED flashes. The relay is in the high-impedance state.
5. Test the circuit diagnosis by simulating 2.0 mA ±1 % on the input if a MAX
alarm is configured and 21.5 mA ±1 % if a MIN alarm is configured.
The red LED flashes. The relay is in the high-impedance state.
6. Set back the device to the original settings for the current application after the
test.
Figure 5.1 Proof test set-up for KF**-CRG2-(Ex)1.D
Usage in Zone 0, 1, 2/Div. 1, 2 only for KFD2-CRG2-Ex1.D or KFU8-CRG2-Ex1.D
Zone 0, 1, 2
Div. 1, 2
Zone 2
Div. 2
Multimeter
(mA)
Multimeter
(V)
Fault
KFD2-CRG2-Ex1.D
16
17
18
10
11
12
7-
8+
mA
2-
1+
3+
Multimeter
(mA)
220 Ω/150 mW
Multimeter
(Ω)
Multimeter
(Ω)
Supply +
Supply -
24 V DC
Power
supply
I supply
Supply
Bus
NAMUR
sensor
simulator
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