32
9 Troubleshooting for Fault Messages Displayed on APP
Fault Messages
Description
Corrective Action
Grid Overvoltage /
Undervoltage
Voltage on AC side
exceeds the allowable
range
Check if the grid voltage is within the
allowable range. Contact the local
operation and maintenance personnel
for any help.
Grid Over-frequency
/ Under-frequency
Frequency on AC side
exceeds the allowable
range
Check if the grid frequency is within
the allowable range. Contact the local
operation and maintenance personnel
for any help.
No Grid
Fail to detect the
voltage on AC side
Check the connection of AC circuit
breaker, AC fuse and AC terminals.
Contact the local operation and
maintenance personnel for any help.
PV Reversely
Connected
Positive and negative
polarity of DC input
PV 1 or PV 2 are
reversely connected
Contact the local operation and
maintenance personnel for any help.
PV Overvoltage
DC input voltage is
excessive
Contact the local operation and
maintenance personnel for any help.
Insulation
Impedance Fault
Ground impedance of
PV modules is less
than the allowable
value
Check the connection of PV arrays
and earth wire, then restart the
inverter. Contact the local operation
and maintenance personnel for any
help.
Leakage Current
Abnormality
Leakage current
exceeds the allowable
value
Check the connection of PV arrays and
earth wire, then restart the inverter.
Contact the local operation and
maintenance personnel for any help.
