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software to examine the protection mode. Refer to the installation manual about using the monitoring
software.
Once the user knows the protection mode, refer to the following sections for solutions.
Table 8-1: Troubleshooting
Fault Type
Fault Generation
condition
Possible Causes
Troubleshooting
BMS fault
The cell voltage sampling
circuit is faulty.
The cell temperature
sampling circuit is faulty
The welding point for cell voltage
sampling is loose or disconnected.
The voltage sampling terminal is
disconnected.
The fuse in the voltage sampling circuit
is blown.
The cell temperature sensor has failed.
Replace the battery.
Electrochemical
cell fault
The voltage of the cell is low
or unbalanced.
Due to large self- discharge, the cell
over discharges to below 2.0V after
long term storage.
The cell is damaged by external
factors, and short circuits, pinpricks, or
crushing occur.
Replace the battery.
Overvoltage
protection
The cell voltage is greater
than 3.65 V in charging state.
The battery voltage is greater
than 58.4 V.
The busbar input voltage exceeds the
normal value.
Cells are not consistent. The capacity
of some cells deteriorates too fast or
the internal resistance of some cells is
too high.
If the battery cannot
be recovered due to
protection against
abnormality contact
local engineers to
rectify the fault.
Under voltage
protection
The battery voltage is less
than 40V.
The minimum cell voltage is
less than 2.5V
The mains power failure has lasted for
a long time.
Cells are not consistent. The capacity
of some cells deteriorates too fast or
the internal resistance of some cells is
too high.
Same as above.
Charge or dis-
charge high
temperature
protection
The maximum cell
temperature is greater than
60◦C
The battery ambient temperature is too
high.
There are abnormal heat sources
around
Same as above.
Charge low
temperature
protection
The minimum cell
temperature is less than 0◦C
The battery ambient temperature is too
low.
Same as above.
Discharge low
temperature
protection
The minimum cell
temperature is less than
-20◦C
The battery ambient temperature is too
low.
Same as above.
By checking the above data and sending the data to the service personnel of our company, the
service personnel of our company will reply the corresponding solution after receiving the data.
9. Firmware Update
9.1 USB Upgrade
USB only supports USB flash drives with FAT32 file system format.
