APC AP9930 Datasheet download pdf (Page 12)

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USER’S GUIDE

battery management system

String Polarity Mismatch. The second battery string’s polarity is reversed

from the polarity of the first battery string. The Battery Management System

will not detect the second string if its polarity is reversed.

Battery String A Missing. Minor Alarm. At start-up, the Battery

Management System twice attempts to detect the polarity of Battery String

A. If both attempts fail, the Battery Management System generates a

Battery String A missing fault.

Blown Fuse or Open Circuit on Battery String Connector. Minor

Alarm. The BMS detects an individual battery voltage of less than 3 VDC.

Possible Causes Corrective Action

Second battery string’s

polarity does not match

the first string’s polarity

• Reverse the order of the battery leads connected to one

of the battery strings.

Possible Causes Corrective Action

Single battery string is

connected to the String B

input

• Connect the battery string to the String A connector. If

you are using only one battery string, it must be

connected to the String A input.

Blown battery lead fuse on

String A, Battery #1

• Replace the blown battery lead fuse.

Possible Cause Corrective Action

Blown battery lead fuse • Replace the blown battery lead fuse.

Open circuit in the battery

wiring harness

• Check the battery wiring harness connections.

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APC AP9930 Datasheet Page 12