Alpha Technologies GMX-915 - Manual (Page 51)

51 017-932-B0-002, Rev. B
3. When the battery voltage appears to stabilize (approximately 8-10 minutes), use a
multimeter to measure individual battery voltages under load.
. The difference between any of the batteries should not be greater than 0.3Vdc. Replace
defective or marginal batteries with an identical type of battery.
5. Record the loaded battery voltages in the maintenance log.
6.0 GMX Power Supply Maintenance, continued
6.3 Check Battery Voltage Under Load
In order to completely verify a battery’s ability to supply load, the battery must be tested while
under a load. This is the most accurate method to determine the condition of the batteries.
If available, use a battery load tester and follow the manufacturer’s instructions to test the
individual batteries. If a battery load tester is not available, use the following procedure.
Weak or severely discharged batteries can explode when put under load. As an added
safety precaution, place the enclosure’s door between the operator and batteries before
attempting standby operation.
WARNING!
• If installed, disconnect the AlphaGuard–Charge Management Technology Card (AG-CMT) prior to
measuring battery voltage.
• Even with an AG-CMT present, any battery which fails the 0.3V load test must be replaced with an
identical type of battery.
NOTE:
Test Procedure:
1. If the batteries appear functional (i.e., if they have passed “Check Battery Open Circuit
Voltage” test), reconnect the Battery Input connector to the Inverter Module, switch on the
battery breaker, and wait for the No Batteries alarm to reset.
2. Simultaneously press ENTER and DOWN on the Smart Display to manually start an
inverter self-test.
The GMX Power Supply will not go to self-test if the batteries are defective or disconnected. Initially, the
battery voltage will appear to drop quickly (this is “surface” charge), but the battery voltage should stabilize
quickly.
NOTE: