36 User Manual
Appendix A: FAQ (Frequently asked questions)
Sometimes, the PV system does not work normally; we recommend the following
solutions for average troubleshooting. This can help the technician to understand
the problem and take a proper action.
LCD display
Possible actions
Clearable
Fault
Isolation Fault
1. Check whether the inverter is earthed and test impedance
between PV (+) & (-) and the impedance must exceed
3MΩ;
2. Check whether the AC-side has contacts with earth.
Ground Current Fault
1. The ground current is too high.
2. After cutting off the AC side connection, unplug the inputs
from the PV generator and check the peripheral AC system.
3. After the cause is cleared, re-plug the PV panel and AC
connection, and check PV inverter status.
Grid Fault Fac Over
Range Vac Over
Range
1. Wait for 5 minutes, if the grid returns to normal, PV inverter
automatically restarts.
2. Make sure grid voltage and frequency meet the local
specifications.
Utility Loss
1. Grid is not connected.
2. Check grid connection cables.
3. Check grid usability.
4. If grid is ok and the problem exists still, maybe the fuse in
the inverter is open, please call service.
Over Temperature
1. The internal temperature of inverter is higher than specified
normal value.
2. Find a way to reduce the ambient temperature.
3. Or move the inverter to a cooler environment.
PV over Voltage
1. Check the open PV DC voltage, and see if it is greater than
or too close to 900VDC
2. If PV DC voltage is less than 900VDC, and the problem
still occurs, please call local service.
Permanent
Fault
Consistent Fault
Disconnect PV (+) or PV(-) from the input, restart the inverter.
Relay-Check Fail
1. Disconnect all PV (+) or PV (-).
2. Wait for a few seconds.
3. After the LCD switches off, reconnect and check again.
4. If the problem remains, please call local service.
DC INJ High
EEPROM R/W Fail
SCI Failure
AC HCT Fault
GFCI Failure
If the PV DC voltage is higher than 200V, while the inverter still doesn’t work,
please call the local service.
During periods of little or no sunlight, the inverter may continuously start up and
