Siemens S5-135U/155U User Manual
Page 111
4-45
System Manual
C79000-G8576-C199-06
The recharging time for the battery may be up to 46 hours, depending on its
state of charge. Please note that backup via the battery is only possible within
limits during this time.
If the rechargeable battery does not work after replacement, there may be the
following faults:
IF...
THEN...
“RB low” LED does not go off after
6 minutes,
the rechargeable battery is incorrectly connected
or faulty or the charging circuit in the PSU is
faulty.
“RB low” LED goes off but the
relay does not pick up,
the battery has failed and the yellow “MB low”
LED lights up or the battery compartment is
faulty.
red
black
Hole
Fan
sub-
assembly
Rechargeable
battery
After Replacement
Replacing the
Rechargeable
Battery in the Fan
Subassembly
Central Controllers and Expansion Units Power Supply Units