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Siemens S5-135U/155U User Manual

Page 103

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4-37

System Manual
C79000-G8576-C199-06

Other faults can be indicated by the green LEDs on the front plate going off.

LEDs

Possible Cause

Action

Green LEDs go off
and the power

l f il

The Enable jumper is
out of place

Check the jumper.

supply fails.

Latching Off-switching
by overvoltage at
output

Switch the supply voltage off and on
again. If this does not clear the fault,
there is an internal fault.

Internal fault in the
PSU

Send in the PSU for repair.

Base load too low

Increase the base load

Other Faults

Central Controllers and Expansion Units Power Supply Units