Table 8-4 LCD Troubleshooting PROTECTION Cont’d
TempOver
(Over-temperature
protection)
1. Confirm the external ambient temperature is
within the specified range of operating
temperature
2. Check whether air inlet is blocked
3. Check whether fan is blocked
4. Check whether the location of installation is
appropriate or not
5. Observe for 30 minutes and see whether the
alarm will be eliminated automatically
6. Contact post-sales service if not corrected
Protect0180
(The sampling
offset of DCI)
1. If the inverter can start up, then recalibrate
2. If the inverter consistently reports this alarm and
can not start up, then replace inverter
1. Raise limit of DCImax (for example, 400mA) to
allow inverter more room to adjust in transient
condition to cope with imbalance of impedance
and voltage between grid phases
2. After raising the limit, if inverter cannot clear fault,
replace inverter
IsolationErr
(Insulation
resistance low)
Check wires of PV and ground:
1. Turn OFF AC switch to disconnect from grid
2. Open fuse holders to isolate PV strings. Test
strings with string test set.
3. Add one PV string at a time, and start up inverter
to see if alarm occurs.
4. If no alarm, turn OFF AC switches to disconnect
from grid and add the next string. Turn AC
switch on and start up inverter again
5. Continue until you can find the string that triggers
the alarm. Trace back the faulted string to find
any leakage to Earth Ground
6. The parameter “ISOResist” in hidden menu can
be adjusted
GFCIErr
(leakage current
high)
Check wires of PV and ground:
1. Turn OFF AC switch to disconnect from grid.
2. Open fuse holders to isolate PV strings. Test
strings with string test set
3. Add one PV string at a time, and start up inverter
to see if alarm occurs.
3. If no alarm, turn OFF AC switches to disconnect
grid, add in the next string. Start inverter again
4. Continue until the string that triggers the alarm is
identified. Trace back the faulted string to find any
leakage to Earth Ground
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