7SR18 Commissioning & Maintenance Guide
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Section 6: Testing and Maintenance
The relays are maintenance free, with no user serviceable parts.
6.1 PERIODIC TESTS
During the life of the relay, it should be checked for operation during the normal maintenance period for the site
on which the product is installed. It is recommended the following tests are carried out:-
Visual inspection of the metering display
1. Operation of output contacts
2. Secondary injection of each element
6.2 MAINTENANCE
Relay failure will be indicated by the ‘Protection Healthy’ LED being off or flashing. A message may also be
displayed on the LCD.
The relay should be returned as a complete unit. No attempt should be made to disassemble the unit to isolate
and return only the damaged sub-assembly. It may however be convenient to fit the withdrawable relay to the
outer case from a spare relay, to avoid the disturbance of relay panel wiring, for return to Siemens Protection
Devices Ltd. The withdrawn relay should never be transported without the protection of the outer case.
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