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    BMS AP9921X-AP9922; alarms “Battery Dry out” Sulfation Exists

     
     
     
    Issue:
    BMS AP9921X-AP9922; alarms “Battery Dry out” Sulfation Exists
     
    Product line:
    Battery Management System (BMS) AP9921X & AP9922
     
    Environment:
    All models, all serial numbers
     
    Cause:
    The response current is lower than the benchmark. Default: 30% lower than the benchmark NOTE: This alarm indicates that there is potential for a battery dry out. It does not indicate that there is a failed battery in the string.
     
    Resolution:
    Inspect the battery. Closely monitor the battery to ensure that battery dry out does not occur. • If random batteries occasionally generate Battery Dry out alarms, the Charge Current Deviation from Benchmark setting may be too close to the normal deviation range of the battery string. To reconfigure this value, see Charge Current Deviation From Benchmark • If a specific battery causes repeated alarms (especially if the alarms have increasing deviation percentages), the battery is failing. Replace the battery.
     
     

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