APC AP9930 Datasheet download pdf (Page 11)

®®

USER’S GUIDE

battery management system

Loss of System Power. The Battery Management System is not powered.

Sensor Input Fault. Minor Alarm. The number of sensors the BMS detects

does not match the number of battery strings.

Possible Causes Corrective Action

Power leads are swapped

or backwards

• Reverse the power leads.

Power leads are not

connected to a power

source

• Connect the Battery Management System to a power

source.

Blown power lead fuse • Check the Battery wire harness for pinched or frayed

wires.

• Replace the fuse. Monitor the Battery Management

System for more blown power lead fuses, as this is a sign

of an internal problem with the Battery Management

System.

Possible Causes Corrective Action

Current sensor is not

installed on each battery

string.

• Install a current sensor for each battery string connected

to the Battery Management System.

Current sensors not

correctly addressed.

• Check DIP switch settings for each current sensor. String

A’s sensor should have DIP switch #1 set to On (all

others Off), and String B’s sensor should have DIP

switch #2 set to On (all others Off).

Ambient temperature

sensor missing

• Install an ambient temperature sensor in the open port on

one of the current sensors.

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APC AP9930 Datasheet Page 11