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6.13
Regular tests
Regularly test the function of the entire safety loop according to IEC/EN 61508 and EN 61511.
The intervals for the inspection are specified by the intervals for the individual devices in the safety loop.
It is the responsibility of the operator to select the type of inspection and the intervals in the specified
period of time.
The test must be carried out so that the correct function of the safety device can be demonstrated in
conjunction with all components.
Possible behavior for the recurring tests in order to detect dangerous and undetected device faults
1. Apply a suitable signal at the input of the device in order to obtain the not conductive state at the
output.
2. Test whether the output is not conductive.
3. Test the conductive state in the same manner.
4. Establish the full function of the safety circuit.
5. Establish normal operation again.
Using this test, approximately 99 % of the possible "du" ("dangerous undetected") faults in the device
are covered.
If the function test is negative, the device has to be taken out of operation and the process maintained
in a safe state by other measures.
6.14
Repairs
The devices have a long life cycle, are protected against malfunctions, and are maintenance-free.
If a device fails despite this, send it back to JUMO GmbH & Co. KG. Specify the type of malfunction and
the possible reason for the malfunction when doing so.
Use the original package or a suitably secure transport container to send back devices for repair.
Download the "Supplementary sheet for product returns" from our website, please fill it out, and send it
together with the faulty device to:
JUMO GmbH & Co. KG
Moritz-Juchheim-Straße 1
36039 Fulda
GERMANY
6 Safety-related applications
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