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APPENDIX B – FAILURE CODES OF THE PSBEN 27,6V POWER SUPPLY
Technical
output
activation
- No AC mains supply
- F
MAIN
fuse failure
- Blown F
AUX
fuse
- AUX output overload
- Blown F
BAT
fuse
- Short circuit in the battery circuit
- Short circuit in the AUX output circuit
- Worn out batteries
- Undercharged batteries
- Battery not connected
- The output voltage of the PSU over 29.4V
Battery charging
circuit failure!
- The output voltage of the PSU set too low ,
below 26V
- Battery charging circuit failure
- The output voltage below 23,6V (during
buffer operation)
- The battery voltage has dropped below 23V
(during battery-assisted operation)
Low battery voltage –
off!
- the battery voltage has dropped below 20V
(during battery-assisted operation)
- Activation of the input of collective failure: EXTi
Internal damage of the
PSU.
- no communication with LCD panel
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