Demand test descriptions and error codes - Avaya Support

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 Replacing the Battery and Battery Charger (J58890CE). The system will detect
one of the following three 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)
WARNING: Always
Note: An
Note: If
1. Move the power switch on the battery charger to OFF.
turn off the battery charger before replacing the batteries. Failure to do so
will result in damage to the 397C battery charger.
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).
Note:
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.
5. Check the battery dates and the preventive maintenance log. Replace the batteries if they
are more than 2.5 years old.
Note:
any defective batteries are found, replace all of them. Batteries are ordered in
sets of three and should be replaced as such.
6. If no defective batteries are found, replace the entire charger.
7. Close the cover and secure it with the screw.
8. Reconnect the cord and move the power switch to ON.
774 Maintenance Alarms for Communication Manager, Media Gateways and Servers