Testing The Battery Backup Time - Alpha Technologies CFR 7.5K Operator's Manual

5.1 Testing the Battery Backup Time

This test measures how long the batteries can provide backup power by having them power the
loads until they are discharged.
Tips:
• This test should be done once a year when the batteries are new. When the batteries are
three years old or older, it should be done once every six months.
• This test should be done when new loads are connected to the unit.
• The unit should have been in Line Present mode for 24 hours before starting this test so
the batteries are fully charged.
• Do a self test (Section 3.3) first. If it passes, do this test. If it doesn't find out why before
proceeding.
• For reference, compare your measured time to the times listed in Section 5.6, "Battery
Run Times." Because of various factors, your time may not match the times listed.
Procedure:
1
Switch off the Input circuit breaker.
The display panel's Line Failure LED turns on.
The unit is operating on backup battery power.
Record this start time.
2
The Low Battery Warning LED turns on.
Record this time.
3
The run time is the time between
4 Turn on the Input circuit breaker.
The unit runs on line power and the batteries
start charging
Battery Backup Time Test Finished
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1 and 2 .
5 Maintenance