Pylontech US5000 Series Operation Manual page 33

Check the communication between battery system and inverter whether
established or not; Check the ADD switch on battery module whether is set
correctly or not;
Under this condition, the BMS remains functional without damage. Just
leave the module switched OFF and wait for the battery voltage drop down
naturally(15mins) then restart. If then no alarm comes out, this means the
module is ready for work.
6） Buzzer rings and ALM solid
j) Reverse connection of cables.
Solution: Power off all battery and inverters. Disconnect breaker. Check the
cable connection and disconnect all power cables. Check the power port
damaged or not. Then try turn on the single module, without any cable
connected. If no alarm, then it is reverse connection of cables. Switch off
the module and contact your local distributor.
k) MOSFAIL.
Solution: Power off all battery and inverters. Disconnect breaker. Check the
cable connection and disconnect all power cables. Check the power port
damaged or not. Check the setting of inverter or charger, check the
communication between inverter and battery system.
Try turn on the single module, without any cable connected. If still buzzer
rings. Then switch off the module and contact your local distributor.
7） After switch On, the module turns on directly
l) BMS failure.
Solution: Switch off the module and contact your local distributor.
Excluding the points above, if the faulty still cannot be located, turn off
battery and contact your local distributor.
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