Pylontech M1C-UL9540 User Manual page 90

Section B During operation：
(1) Error Code checked from BMS (Modbus protocol Appendix IV or CAN ID 0*4250&0*4290):
*The 'Failure Definition' and 'Failure Mode' column is reference from Pylontech Modbus protocol
Appendix IV Error code 1 bit to present.
Failure Failure
Type Definition
Input RV Err (Bit4)
External
DC OVER input
External over voltage error
(Bit3)
Emergency stop
External
(Bit13)
Current
Current Leakage
Error (Bit21)
Leakage
Self-test
module Initial
Self-test
Error (Bit16)
Self-test
module
Self-test
coulomb error
(Bit15)
Self-test module
detecting
Self-test
amount error.
(Bit14)
Safety check
Self-test
failure (Bit11)
Self-test volt
Self-test
error (Bit10)
Battery
Battery cell damage error
(Bit6)
Possible Reason
D+ D- reversely
connected.
D+ D- voltage
extremely higher than
battery system
voltage.
Command by external
device via dry
contactor.
Current
Leakage >25mA.
Self-test failed.
Self-test failed.
Self-test failed.
Chip self-test failed.
Battery cell voltage
measurement
mismatch with DCBUS
voltage measurement.
Battery cell voltage
measured at < 2.0V
86
Solution
Check the external power cables of the
polarity and connection.
Check external inverter`s voltage whether
match with the battery system or not.
Command by external device, not an error
actively report by Battery system.
1.With insulation glove, disconnect the
battery system and contact Pylontech
service engineer.
1. Restart.
2. If problem remain, contact Pylontech
service engineer.
Contact Pylontech service engineer.
Contact Pylontech service engineer.
1.Restart.
2.If problem remain, contact Pylontech
service engineer.
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
i i
Restart.
1.
Swap out the RED LED module.
2.
Use multimeter to measure the battery
3.
module power terminal voltage, if is the
same as the BMS reading value, then it`s a
true cell damage. Otherwise please swap
the BMU of the module.