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Alpha ESS Co., Ltd.
Page 43 of 45
7. Troubleshooting
Battery and BMS troubleshooting
Error Type
Cell temperature different fault
Contact with Alpha service
Contact with Alpha service
Module charge over current
fault
Contact with Alpha service
Module discharge over current
fault
Contact with Alpha service
Pole over temperature fault
Contact with Alpha service
Contact with Alpha service
cell volt different fault
Contact with Alpha service
cell discharge under
temperature fault
Contact with Alpha service
Contact with Alpha service
Insulation resistan fault
Cut off BMS at the first, then operate
in power sequence when power the
system
Check communication connection
between batteries (LMU and LMU),
battery and HV900112 (LMU and
BMU)
Cell over temperature fault
Contact with Alpha service
Check communication cable between
HV90012s (BMU and BMU), also
HV900112 and TOP BMU Box (BMU
and TOP BMU)
Cell charge under temperature
fault
Contact with Alpha service
Contact with Alpha service
Contact with Alpha service
Emergency Handling Plan
In order to prevent accidents such as electric shock, fire or explosion, the emergency
switch should be pressed immediately to stop the equipments when abnormal sound, smell
or sparks is found.