Other Faults - Sungrow SG2500-MV System Manual

11 Troubleshooting
Branch rev-Idc-high
Alarm
Possible The reverse current of the branch on the DC side is detected to exceed the
permissible range
reason
Check the abnormal branch when inverter is voltage-free
Measure
Remark Before device stops, the non-abnormal branches can work normally and inverter
can operate in grid-connection normally
Alarm Branch fwd-Idc-high
The forward current of the branch on the DC side is detected to exceed the
Possible
permissible range
reason
Check the abnormal branch when inverter is voltage-free
Measure
Before device stops, the non-abnormal branches can work normally and inverter
Remark
can operate in grid-connection normally
Alarm
Branch breaker flt
Possible
Circuit breaker of the branch on the DC side is abnormal and this branch cannot
reason work normally
Measure Check the abnormal circuit breaker when inverter is voltage-free
Remark Before device stops, the non-abnormal branches can work normally and inverter
can operate in grid-connection normally
AC breaker fkt
Alarm
Possible AC side circuit breaker is abnormal
reason
Measure
Check the AC circuit breaker when inverter is voltage-free
Remark
Before device stops, inverter can operate in grid-connection normally
11.5

Other Faults

Fault Inverter shuts down shortly after start-up
Possible
DC input voltage just reaches the inverter start-up voltage. Voltage will decrease
reason and inverter will stop when it is under load.
Measure Design the serial and parallel connection in accordance with the open circuit
voltage; increase the input DC voltage; avoid adopting the critical voltage
Remark
-
Fault
LCD Display Cannot Start or Stop Inverter
Possible
Communication malfunction between the LCD display and the DSP; LCD power
reason supply malfunction
Measure Check the connection between the LCD display and the DSP when inverter is
voltage-free
Remark -
82
System Manual