Avaya 03-300430 User Manual

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 

on page 1870. 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.

1. Move the power switch on the battery charger to OFF.

!

WARNING:

Always 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:

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.

5. Check the battery dates and the preventive maintenance log. Replace the batteries if they 

are more than 2.5 years old.

Note:

If 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.