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Table 7-5 LCD Troubleshooting PROTECTION (cont.)
Type Error/State Fault Description / Instruction
Protection
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.
4. I
f no alarm, turn OFF AC switches to disconnect grid, add in the
next string. Start inverter again
5. Continue until the string that triggers the alarm is identified.
Trace back the faulted string to find any leakage to Earth
Protect0150
(Mini MCU Fault)
1. Restart inverter by turning both AC and DC switches OFF. Wait
for 1 minute for all energy to discharge and turn both switches
ON
2. If inverter cannot clear fault, replace inverter
Protect0110
(BUS over voltage (firmware))
1. Restart inverter by turning both AC and DC switches OFF. Wait
for 1 minute for all energy to discharge and turn both switches
ON
2. If inverter cannot clear fault, replace inverter
Protect0100
(The sensor fault of leakage
current)
1. Restart inverter by turning both AC and DC switches OFF. Wait
for 1 minute for all energy to discharge and turn both switches
ON
2.
If inverter cannot clear fault, contact CPS Service to replace Filt
board or inverter.
PVxReverse
(PVx input reverse connection
x=1,2,3)
2. Open Fuse holders to isolate PV strings
3. Use meter to find out which PV string is connected in reverse
polarity
4. Correct PV string connection
PVx Over current
(PVx Over current x=1,2,3)
1. Check PV input Current
2. Restart inverter by turning both AC and DC switches OFF. Wait
for 1 minute for all energy to discharge and turn both switches
ON
3. If inverter cannot clear fault, replace inverter
PV2VoltOver
(PVx Over Volt x=1,2,3)
1. Measure voltage at DC terminals in wiring box and compare
with reading in “Measurement Data” menu. PV voltage must be
less than 1000V in open circuit condition
2. If display reading is not within 2% of meter reading, replace
inverter
3. If display reading is within 2% of meter reading, adjust number
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