APC AP9930 Datasheet download pdf (Page 13)

®®

USER’S GUIDE

battery management system

Discharge or Charger Inactive. Minor Alarm. The BMS detects 5 amps of

continuous discharge current on either battery string for more than 5

seconds.

Charger Voltage Low. Minor Alarm. After a discharge or application of

power, the Charger Voltage Low alarm condition is ignored for 60 minutes.

After the 60-minute delay, the Charger Voltage Low alarm occurs if the

string voltage value (the sum of all battery voltages in the string) is below

the string voltage limits.

Possible Causes Corrective Action

Loss of AC to power supply • Restore AC input before batteries are exhausted.

Power supply overloaded • Check for short circuits on load

• Remove excess load on system

Current sensor entered

calibration mode during a

battery charge

• Re-calibrate current sensor(s) by performing calibration

with no current flowing.

Current sensor installation

reversed

• If a discharge is indicated while the batteries are

charging, reverify orientation of sensor and reverse if

not installed correctly.

Possible Causes Corrective Action

Power supply charger

setting too low or failure of

charger temperature

compensating circuit

• Check charging system.

• Reset charger voltage or repair if required.

Incorrect temperature

compensation selected

• Verify that the configured temperature compensation

method (ambient or battery) matches the power

supply’s compensation method.

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APC AP9930 Datasheet Page 13