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System Manual
C79000-G8576-C199-06
Power supply faults are indicated via relay contacts and LEDs.
The following table shows when the relay contacts are open or closed:
Power Supply Relay Contacts 1-2 Relay Contacts 2-3
Switched off Open Closed
In normal operation Closed Open
During fault Open Closed
The LEDs indicate the following faults:
LED Cause Action
“Fan Fault” LED
lights up.
A fan fault has occurred. Replace fan
“Batt. low” LED
lights up.
The battery voltage has dropped below
2.7 V.
Replace backup
battery
Fault Indications/
Diagnostics
Central Controllers and Expansion Units Power Suppl
Unit
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