User Manual 9 Troubleshooting and Maintenance
73
Low system
insulation
resistance, which
is generally
caused by poor
insulation to
ground of the
module/cable or by
rainy and damp
environment.
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 correction
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. If the fault is not caused by the foregoing
reasons and still exists, contact Sungrow
Service.
Wait for the inverter to return to normal.
Disconnect the AC and DC switches, and
reconnect the AC and DC switches 15
minutes later to restart the inverter.
If the fault still exists, contact Sungrow
Service.
Low ambient
temperature, the
ambient
temperature is
lower than the
temperature at
which the inverter
can operate
normally.
Stop and disconnect the inverter. Restart the
inverter when the ambient temperature falls
within the operation temperature range.
Wait for the inverter to return to normal.
Disconnect the AC and DC switches, and
reconnect the AC and DC switches 15
minutes later to restart the inverter.
If the fault still exists, contact Sungrow
Service.
PV input
configuration
abnormal, PV input
mode error
Stop and disconnect the inverter. Reset the
input mode of the PV array.
Wait for the inverter to return to normal.
Disconnect the AC and DC switches, and
reconnect the AC and DC switches 15
minutes later to restart the inverter.
If the fault still exists, contact Sungrow
Service.
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