84
Fault code
Fault name
Corrective measures
39
Low System Insu-
lation Resistance
Wait for the inverter to return to normal. If the
fault occurs repeatedly:
1. Check whether the ISO resistance protection
value is excessively high via the app or the LCD,
and ensure that it complies with the local
regulations.
2. Check the resistance to ground of the string
and DC cable. Take corrective measures in case
of short circuit or damaged insulation layer.
3. If the cable is normal and the fault occurs on
rainy days, check it again when the weather turns
fine.
4. Contact Sungrow Customer Service if the pre-
ceding causes are ruled out and the fault persists.
106
Grounding Cable
Fault
1. Check whether the AC cable is correctly
connected.
2. Check whether the insulation between the
ground cable and the live wire is normal.
3. Contact Sungrow Customer Service if the pre-
ceding causes are ruled out and the fault persists.
88
Electric Arc Fault
1. Disconnect the DC power supply, and check
whether any DC cable is damaged, the connec-
tion terminal or fuse is loose or there is a weak
contact. If so, replace the damaged cable, fasten
the terminal or fuse, and replace the burnt
component.
2. After performing step 1, reconnect the DC
power supply, and clear the electric arc fault via
the App or the LCD, after that the inverter will re-
turn to normal.
3. Contact Sungrow Customer Service if the fault
persists.
84
Reverse Connec-
tion Alarm of the
Meter/CT
1. Check if the meter is wrongly connected.
2. Check if the input and output wiring of the me-
ter is reversed.
3. If the existing system is enabled, please check
if the rated power setting of the existing inverter
is correct.
9 Troubleshooting and Maintenance
User Manual
Summary of Contents for SG250HX-US
Page 2: ......
Page 6: ......
Page 10: ......
