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Section 5: Testing and Maintenance
7SR24 relays are maintenance free, with no user serviceable parts.
5.1
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:-
1.
Visual inspection of the metering display
2.
Operation of output contacts
3.
Secondary injection of each element
5.2
Maintenance
Relay failure will be indicated by the 'Protection Healthy' LED being off or flashing. A message may also be
displayed on the LCD. In the event of failure Siemens Protection Devices Ltd. (or the nearest Siemens office)
should be contacted.
The relay should be returned as a complete unit. No attempt should be made to dismantle 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 withdrawable relay should never be transported without the protection of the outer case.
©2013 Siemens Protection Devices Limited
Chapter 6) 7SR23 DAD Commissioning & Maintenance Guide
Chapter 6 Page 22 of 26
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