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Functional Safety M-LB-(Ex-)4000-System
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
in accordance with the characteristic safety values. 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:
•
2 digital multimeter with an accuracy of 0.1 %
•
Variable power supply 0 V DC to 50 V DC and current limitation
Proof Test Procedure
1.
Put out of service the entire safety loop. Protect the application by means of other measures.
2.
Prepare a test set-up, see following figures.
3.
Test the device, see following tables.
4.
After the test, reset the device to the original settings.
avg
23
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