Siemens S5-155U System Manual page 118

Power Supply Units
After replacement
Replacing the rechargeable
battery in the fan subassembly
4 - 48
Step Action
6 Insert the new rechargeable battery pack in the left-front
part of the fan subassembly (plus pole to the right).
Ensure that the black connecting cable is lying on the
floor of the battery compartment when you insert the
battery. Secure it with the screws from below.
7 Insert the fan subassembly with the tab at the rear into the
housing and swivel it up until it engages.
8 Press the Reset button.
With a fully discharged battery, the message can only be
acknowledged after at least 6 minutes.
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 the rechargeable battery is incorrectly
go off after 6 minutes, connected or faulty or the charging circuit
in the PSU is faulty.
"RB low" LED goes off the battery has failed and the yellow "MB
but the relay does not low" LED lights up or the battery
pick up, compartment is faulty.
Hole
System Manual
C79000-B8576-C199-03