Sungrow SG500MX, Руководство по эксплуатации

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10 Troubleshooting Operation Manual
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Fault LVRT Run
Possible
reason Grid voltage is below 0.9Un and the LVRT function is enabled
Measure Warn will disappear automatically when grid voltage recover normal
Remark -
Fault CT-Unbalanced
Possible
reason Current transformer (CT) on the inverter control cabinet is abnormal
Measure
Check and service the CT on the measuring board when inverter is voltage-free
Remark -
Fault RISO-low
Possible
reason Inverter DC side insulation resistance is lower than the set value.
Measure
-
Remark Only alarm display. Inverter can operate normally.
Fault DC Sensor-err
Possible
reason Inverter DC sensor abnormal
Measure
Check and service the DC sensor when inverter is voltage-free
Remark
-
10.5 Other Faults
Inverter Shuts Down Shortly After Start-Up
Possible reason: DC input voltage just reaches the inverter start-up voltage. Voltage will decrease
and inverter will stop when it is under load.
Solution: design the serial and parallel connection in accordance with the open circuit voltage;
increase the input DC voltage; avoid adopting the critical voltage.
Hear-Sink is Over-Temperature
Possible reason: cooling fan failure; over-temperature of the air inlet; bad ventilation of the
switch room, etc..
Solution: check and replace the cooling fan; reduce the temperature of the switch room; clean
the air duct and widen the air duct.
Noise is Too Loud during Inverter Operation
Possible reason: abnormal operation of the inverter and transformer; fan failure.
Solution: check if the power is within the permissible range; measure if the grid-connected
current and voltage waveform are normal (if not, the noise will be loud and the transformer will
be overheating); check and replace the fan.
LCD Display Cannot Start or Stop Inverter
Possible reason: communication malfunction between the LCD display and the DSP; LCD power
supply malfunction.
Solution: check the connection between the LCD display and the DSP.