Section 5: Testing And Maintenance; Periodic Tests; Maintenance - Siemens 7SR224 Technical Manual

Section 5: Testing and Maintenance

These 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:-
Visual inspection of the metering display
1. Operation of output contacts
2. 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 contact the local Siemens office or the manufacturer – see defect
report sheet in section 5.3.
The relay unit comprises an outer case and the withdrawable relay element. 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. The withdrawable relay should never be transported without the
protection of the outer case.
©2010 Siemens Protection Devices Limited
7SR224 Argus Commissioning & Maintenance Guide
Chapter 6 Page 67 of 73