45
Problem Possible Cause
Solution
Overfrequency
1 The mains AC frequency
exceeds 64 Hz.
2 The grid frequency is still
above 61 Hz after
overfrequency.
Usually, the charger will be re-
connected to the grid once the
grid returns to normal. If the prob-
lem occurs repeatedly:
1 Measure the actual grid fre-
quency, and contact the local
power company for solutions
if the grid frequency is above
61 Hz.
2 Contact Sungrow Customer
Service if the problem
persists.
Underfrequency
1 The mains AC frequency
is below 47 Hz.
2 The grid frequency is still
below 49 Hz after
underfrequency.
Usually, the charger will be re-
connected to the grid once the
grid returns to normal. If the prob-
lem occurs repeatedly:
1 Measure the actual grid fre-
quency, and contact the local
power company for solutions
if the grid frequency is below
49 Hz.
2 Contact Sungrow Customer
Service if the problem
persists.
EV
Leakage
current
The DC leakage current is
above 6 mA
1 Stop charging and pull out
the charging connector.
When the charger returns to
normal, try charge again. If
the problem occurs repeat-
edly, contact the EV manu-
facturer's customer service.
2 Stop charging and pull out
the charging connector. Con-
tact Sungrow Customer Serv-
ice if the problem persists.
Overcur-
rent
Output current exceeds the
threshold (formula: the actual
current corresponding to the
duty cycle + 2 A)
Charg-
er
Stuck
relay
The relay is stuck and cannot
be disconnected.
Restart the charger and try again.
If the problem occurs repeatedly,
contact Sungrow Customer
Service.
User Manual 6 Troubleshooting
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