Siemens siprotec 7SA522 User Manual page 514

Routine Checks and Maintenance
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9-12
Align and fix the rear interfaces again.
Attach all D-subminiature plugs to the matching D-subminiature sockets.
Screw in all the fibre optical connectors where applicable.
Close the protective switches to apply voltage to the power supply. If the green "RUN"
LED does not light, there is a fault in the power supply. The device should be sent to
the factory. See Section 9.6.
7SA522 Manual
C53000-G1176-C119-2