46
Problem Possible Cause
Solution
Leakage
current
detection
circuit
failure
1 The CT terminal has bad
connection or the CT is
malfunctioning.
2 The RCD circuit is
abnormal.
Relay
overtem-
perature
The temperature of the main
relay is too high. It might be a
hardware problem.
CP
failure
Abnormal CP loop circuit on
the main board
Wiring
Input ter-
minal
overtem-
perature
1 The input terminal is
loosely connected which
causes bad connection.
2 The cable’s current-carry-
ing capacity does not meet
the requirements.
1 Ensure that the AC cable is
tightly connected, that the ca-
ble used meets requirements,
and L and N wires are cor-
rectly connected.
2 Contact Sungrow Customer
Service if the problem
persists.
Reverse
polarity
L and N wires are connected
reversely.
Communication er-
ror with the smart
meter
When load balancing is en-
abled, there is no communica-
tion between the energy meter
and the charger for 1 minute
continuously.
1 Check the RS485 wiring be-
tween the energy meter and
the charger.
2 Disable the load balancing
function.
3 Contact Sungrow Customer
Service if the problem
persists.
CT error
The total current collected by
the CT is less than the actual
output current of the charger.
1 Replace the CT.
2 Disable the load balancing
function.
3 Contact Sungrow Customer
Service if the problem
persists.
table 6-2 LED Signals that indicates abnormal conditions
Charger Status LED Signals
Reverse polarity The red LED is glowing
Leakage current The red LED blinks for 4 times (on for 0.5 s, off for 0.5 s)
6 Troubleshooting User Manual
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