Operation; Proof Test - Pepperl+Fuchs KFD2-SR3-2.2S Manual

Functional Safety KFD2-SR3-(Ex)2.2S

Operation

5 Operation
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.
Operating the device
1. Observe the safety instruction 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 24 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
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.
Equipment required:
• Digital multimeter with an accuracy of 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.
• Power supply set to nominal voltage of 24 V DC
• Load resistor i. e. 240 , 2.5 W
• Simulate the sensor state by a potentiometer of 4.7 k (threshold for normal
operation), by a resistor of 220  (short circuit detection) and by a resistor of
150 k (lead breakage detection).
in accordance with the characteristic safety values.
avg
15