9 Troubleshooting and Maintenance
User Manual
66
Code of
fault
Specification
Troubleshooting
049
Phase-S current sampling
channel fault.
050
Phase-T current sampling
channel fault.
100
Inverter overcurrent
hardware protection.
AC current has exceeded
the hardware limit.
1. Wait a moment for inverter recovery.
2. Contact SUNGROW if the fault reoccurs.
101
Grid over-frequency.
Grid frequency is outside
the permissible range.
1. Check the voltage of the grid.
2. If the grid voltage exceeds the
permissible range of inverter protective
parameters, ask utility grid company for
solution.
3. If the grid voltage is within the
permissible range, contact SUNGROW
Service Dept..
102
Grid under-frequency.
Grid frequency is outside
the permissible range.
103
Grid voltage
synchronization fault.
The grid voltage sampling
differences between the
master and slave DSP.
1. Wait a moment for inverter recovery.
2. Contact SUNGROW if the fault reoccurs.
104
Grid frequency
synchronization fault;
The grid voltage sampling
differences between the
master and slave DSP.
200
The bus voltage exceeds
the set value of the
hardware.
1. Wait a moment for inverter recovery.
2. Contact SUNGROW if the fault reoccurs.
202
PV1 or PV2 current
exceeds the set value of
the hardware.
203
The PV input voltage
exceeds the bus voltage.
1. Check the functionality of the PV
connection terminal.
2. Contact SUNGROW if the fault reoccurs.
300-301
The temperature of some
components inside the
cabinet is too high
1. Check the functionality of the fans.
2. Clean the air inlet and outlet.
3. Clean air grills of outlet.
4. If the fault still exists, please contact
SUNGROW.
302
PV insulation resistance
fault.
1. Check whether the PV connection cables
are intact.
2. Check whether the ambient humidity of
PV components is too high.