Sungrow SG500MX Operation Manual page 54

10 Troubleshooting
Fault F-fault
The grid frequency is outside the permitted range
Possible
reason
Check grid frequency
Measure
Check if the AC cables are securely connected.
Remark Inverter automatically reconnects to the grid once the grid voltage recovers normal
Gnd-flt
Fault
Possible Inverter AC side leakage current to the ground exceeds the set value (default: 5A)
reason
Measure -
Remark Inverter automatically reconnects to the grid once the leakage current recovers
Iac-high
Fault
Internal short-circuit or internal components damages
Possible
reason
Measure Check the AC side cable connection and the control circuit board.
Contact Sungrow
Remark
Fault Temp-flt
Inverter internal temperature exceeds the permitted value
Possible
reason
Check functionality of fan after the device is voltage-free
Measure
Remark Stop the inverter if this fault occurs 10 times per day
PM-high
Fault
Possible Module temperature exceeds the permitted value
reason
Measure Check the module and ventilation after the device is voltage-free
Stop the inverter if this fault occurs 5 times per day
Remark
Fault L over-temp
Reactor temperature exceeds the permitted value
Possible
reason
Measure Check the reactor after the device is voltage-free
Remark -
Fault PDP-pro
Possible Internal fault
reason
Wait 5 minutes for inverter auto-reconnection or disconnect first and then connect
Measure
the AC main switch
Contact Sungrow if the fault insists
Remark Stop the inverter if this fault occurs 5 times per day
Fault Cntr-flt
Possible Contactor connected to the gird failure
reason
Check the contactor after the device is voltage-free
Measure
Remark
Stop the inverter if this fault occurs 5 times per day。
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Operation Manual