Maintenance
Contents of this chapter
This chapter contains information for the maintenance and decommissioning of the
safety function.
Safety circuit maintenance
After the safety function is validated, it must be maintained by periodic proof testing.
If you change the wiring or a component after the start-up, replace a power unit or
its circuit boards, or restore parameters to their factory default values:
• Use only ABB-approved spare parts.
• Register the change to the change log for the safety circuit.
• If parameters were restored to the factory default values: Set the parameters
related to the safety function.
• Do the validation test of the safety function.
• Document the tests and store the report into the logbook of the machine.
Proof test interval
Proof tests are used to detect failures in the safety function. To do a proof test, use
the validation test procedure given in this manual.
Periodic proof testing of the safety function is necessary to maintain the required
SIL/PL-level. In high demand mode of operation, the maximum proof test interval is
20 years. In low demand mode of operation, the maximum proof test interval is 2 or
5 years (high or low demand as defined in IEC 61508, IEC/EN 62061 and EN ISO 13849-1).
Regardless of the mode of operation, it is a good practice to do the proof test for the
9
Maintenance 31
To Next Page
Loading...
