Avaya S8700 Maintenance Manual page 2025

POWER
In a multicarrier-cabinet system, the Battery and Battery Charger MO represents
the battery charger and the battery which are located in the lower left corner of the
cabinet. Should anything go wrong with the battery or charger, they must be
replaced using the procedure described in
Charger (J58890CE)''
problems with the batteries or charger:
Reserve Fault: the charger has detected a problem within itself or the
batteries and has notified the system.
High Charge Rate: the batteries have been charging at a high charge rate
for an excessively long period of time. This indicates that there is a short in
the batteries or the charger.
Prepare to Disconnect (Low Battery): the batteries are in danger of being
drained to a point where the batteries would be damaged. This warning
often occurs after multiple power failures.
The batteries take 30 hours to fully charge after being drained. A fully
charged battery pack should bridge two power failures without causing a
low battery warning to occur.
Replacing the Battery and Battery Charger
(J58890CE)
1. Move the power switch on the battery charger to OFF.
!
2. Disconnect the cord from the outlet on the front of the battery charger.
3. Remove the screw at the top left of the cover and open the cover to access
the charger.
4. Check the battery voltages at the test points. Check all 3 batteries wired in
series (the voltage should be 144 Volts, 3 X 48 Volts = 144 Volts).
555-233-143
below. The system will detect one of the following three
WARNING:
Always turn off the battery charger before replacing the batteries.
Failure to do so will result in damage to the 397C battery charger.
NOTE:
An ordinary voltmeter can be used to check battery voltages at the
test points, but it may not produce valid results. If the battery voltage
readings are below 48 Volts (the voltages at test points should read
144 Volts, 3 x 48 Volts = 144 Volts), the battery is probably defective.
However, a normal voltage reading does not necessarily mean the
battery is good; under load, a defective battery with a normal reading
on the voltmeter may discharge rapidly.
''Replacing the Battery and Battery
Issue 1 May 2002 8-1303