Operations Manual | 25
Troubleshooting
Critical/Serious/Error Alarms:
• Serious – Something is wrong with UPS or battery cabinet and some action or investigation is recommended.
• Critical – A potential UPS or battery damaging situation has occurred and some action or investigation is
required.
• Error – The Battery cabinet encountered an ERROR condition that requires resetting of the BMS due to an over
current condition or contactor stuck condition.
• Single Battery Voltage Higher/Lower than Maximum/Minimum Operating Voltage. Service System. Will only
be reached if batteries are out of balance. It indicates a condition where a battery or batteries will need to be
replaced.
• Over temperature when charging or discharging – Battery should be inspected to see if there is a problem on
any charge or discharge where it reaches the Critical Alarm temperature. It will likely need to be replaced.
• Over-Current on Charge – Max current should not exceed 160Amps per string from the battery charger for
more than 15 seconds. The BMS will open contactor for 135s and not allow charging. Contactor time will reset
and system may try to accept charge again if SOC < 90%.
• Monoblock Voltage Differential – No battery in the system should differ from the remainder of the batteries
by 1.2V. If they do then that battery has lost a cell and will need to be replaced for the system to function
properly.
Conditions where the BMS intervenes:
Charging: Contactor Opens
When charging current > 160Amps persists for 15 seconds the CONTACTOR will open. Contactor will remain open for
135s before resetting itself and allowing charge again. This is to prevent the batteries from receiving too much current.
When charging current > 1000Amps. The CONTACTOR will open and a latching ERROR will occur. The charge current
exceeded the high limit setting. This requires fixing the issue that resulted in the over charge current situation. A reset
of the BMS is required to unlatch this condition.
System was undercharged as noted by ADAh <0, Current < 4A and String Voltage < (BPOV-14V) The contactor will
open and a warning will notify user.
Overcharging of the batteries (System 50% overcharge Error) The contactor will open in the case that ADAh < -40Ah
which signifies an overcharge. (This works the same as All prior releases)
Power Cycle: Breaker Opens
• If the BMS loses power the Breaker will be tripped and Battery Cabinet will no longer provide any discharge ability.
(This works the same as ALL prior releases)
Validation Mode: Breaker Opens
• Discharge ended earlier than expected only possible in Validation Mode
• If the system encounters 1 or more monoblock <10V or >75C the breaker will open on a discharge (ie. Discharge
ended earlier than expected).
