FNS POWER FCIFP48100A - Page 25

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Electrochemical
cell fault
The voltage of the
cell is low or
unbalanced.
1. Due to large self-
discharge, the cell over dis-
charges to below 2.0 V after
long-term storage.
2. The cell is damaged by external
factors, and short circuits,
pinpricks, or crushing
occur.
Replace the bat tery.
Overvoltage
protection
1. The cell
voltage is greater
than 3.75 V in
charging state.
2. The battery
voltage is greater
than 54 V.
1. The busbar input voltage
exceeds the normal value.
2. 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 can- not
be recovered due to
protection against
abnormality contact
local engineers to
rectify the fault.
Under voltage
protection
1. The battery
voltage is less
than 40.5 V.
2. The minimum
cell voltage is less
than 2.7V
1. The mains power failure has
lasted for a long time.
2. 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
1. The battery ambient
temperature is too high.
2. There are abnormal heat
sources around
Same as above.
Charge low
temperature
protection
The minimum cell
temperature is
less than 0
◦
C
1. The battery ambient
temperature is too low.
2. The heater fails to work
Same as above.
Dischargelow
temperature
protection
The minimum cell
temperature is
less than -20
◦
C
1. The battery ambient
temperature is too low.
2. The heater fails to work
Same as above.
By checking the above data and sending the data to the service personnel of our company, the