Functional Safety KFD0-CS-(Ex)*.54*, KFD0-CS-(Ex)*.56*
Operation
201
8-06
15
5
Operation
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 PFD
avg
in accordance with the characteristic safety values provided. 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.
With the following instructions a proof test can be performed which will reveal all of the possible
dangerous faults (diagnostic coverage 100 %).
Equipment required:
•
Digital multimeter with an accuracy better than 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.
•
Variable power supply 0 V DC to 24 V DC
•
Process calibrator with current source/sink function (mA) with an accuracy better
than 20
µ
A
Proof Test Procedure
1. Disconnect the field circuit.
2. Check the device as shown in the following tables.
3. After check reset the device to the necessary settings.
4. Connect the field circuit again.
5. Check the correct behavior of the safety loop. Is the configuration correct?
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.
