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8.2
Inverter Troubleshooting
When the inverter has an exception, its basic common warning and exception handing methods are shown
below.
Alarm Information Measures Recommended
1. If the alarm occurs accidentally, possibly the power grid is abnormal accidentally. No extra action is
needed.
2. If the alarm occurs repeatedly, contact the local power station. After receiving approval of the local
power bureau, revise the electrical protection parameter settings on the inverter through APP.
3. If the alarm persists for a long time, please confirm that:
A0 Grid OV
1) The AC circuit breaker is not tripping frequently (generating an instantaneous high voltage);
2) The wiring of AC cable is followed by the guide in user manual, and high cable impedance can
cause a voltage rise on the grid;
3) The voltage of three-phase inverter between the neutral wire and the ground line exceeds 30V; and
please correct the grid wiring if it exceeds;
If the above problems are excluded, please contact customer service to report a repair.
1.If the alarm occurs accidentally, possibly the power grid is abnormal temporarily. No extra action is
needed.
2.If the alarm occurs repeatedly, contact the local power station. After receiving approval of the local
power bureau, revise the electrical protection parameter settings on the inverter through APP.
3.If the alarm persists for a long time, please confirm that:
A1 Grid UV
1) The AC circuit breaker is disconnected;
2) The AC circuit breaker is damaged (under closed status, please check that the voltage of the inlet is
consistent with that of the outlet);
3) The AC terminals are in good contact.
If the actual measuring voltage is within the specified range, please contact customer service to report
a repair.
1. If the alarm occurs accidentally, possibly the power grid is abnormal temporarily. No extra action is
needed.
2. If the alarm occurs repeatedly, contact the local power station. After receiving approval of the local
power bureau, revise the electrical protection parameter settings on the inverter through APP.
3. If the alarm persists for a long time, please confirm:
1) The AC circuit breaker is disconnected;
A2 Grid Loss
2) The AC circuit breaker is damaged (under closed status, please check that the voltage of the inlet is
consistent with that of the outlet);
3) The AC terminals are in good contact;
4) Whether the power supply line failure.
If exclude all possibilities, please contact customer service to report a repair.
1. If the alarm occurs accidentally, possibly the power grid is abnormal temporarily. No extra action is
needed.
A3 Grid OF
2. If the alarm occurs repeatedly, contact the local power station. After receiving approval of the local
power bureau, revise the electrical protection parameter settings on the inverter through APP.
3. If the alarm persists for a long time, please contact customer service to report a repair.
1. If the alarm occurs accidentally, possibly the power grid is abnormal temporarily. No extra action is
needed.
A4 Grid UF
2. If the alarm occurs repeatedly, contact the local power station. After receiving approval of the local
power bureau, revise the electrical protection parameter settings on the inverter through APP.
3. If the alarm persists for a long time, please contact the customer service.
Check whether the maximum input voltage of a single PV string exceeds the MPPT working voltage.
B0 PV OV
If yes, modify the number of PV module connection strings.
42
8 Maintenance
8 Maintenance
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