Pylontech PowerCube-X1-V2 - Page 45

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of the bypassed module. If
not, further bypass the next
LED off module and repeat the
process.
3. If problem remain, contact
Pylontech service engineer.
Comm.
and
hardware
BMS
Internal
bus error
（Bit9）
CMU internal error
or I2C issue
1. Restart
2. Change the current
measurement board
3. Change the CMU or BMS.
4.If problem remain, contact
Pylontech service engineer.
Failure
Type
Failure
Definition
Possible Reason
Solution
Self-
test
Self-test
volt error
（Bit10）
Battery cell
voltage
measurement
mismatch with
DCBUS voltage
measurement
1.Restart
2.Check the connectivity and
reliability of the power and
comm. cable by reconnection.
3. Swap the current
measurement board or BMS
4.If problem remain, contact
Pylontech service engineer.
Self-
test
Safety
check
failure
（Bit11）
Chip self-test
failed
1.Restart
2.If problem remain, contact
Pylontech service engineer.
External
Emergency
stop
（Bit13）
Command by
external device
via dry contactor
Command by external device,
not an error actively report
by Battery system.
Self-
test
Self-test
module
detecting
amount
error
（Bit14）
Self-test failed
contact Pylontech service
engineer.
Self-
test
Self-test
module
coulomb
error
（Bit15）
Self-test failed
contact Pylontech service
engineer.
Self-
test
Self-test
module
Initial
Error
（Bit16）
Self-test failed
1. Restart
2.If problem remain, contact
Pylontech service engineer.
Comm.
and
hardware
Communicat
ion error
between
master and
slave BMS
（Bit17）
1. Battery
string(s)
over-discharged
2. BMS CMU error
1. Check whether the battery
string(s) has been
overdischarged or not via
multimeter.
2. Check the comm. cables
between master and slave BMS,
make sure the cable is 8PIN
pin – pin CAT5 Ethernet cable.