Sungrow MVS4480-US System Manual

70
Fault Name Fault Cause Fault Level Corrective Method
AC switch fault AC switch fails.
Important
1. Check whether the AC switch
trips.
2. Check whether the appear-
ance of the switch is normal.
3. Check whether the AC switch
can be normally closed/
disconnected.
4. Use a multimeter to measure
whether the AC switch normally
controls the on/off of the circuit.
Heat sink over-
temperature
The temperature
of the heat sink in-
side the inverter is
excessively high.
Important
Check whether the cooling fan is
normal. If so, check the air duct
for blockage.
GFDI-pro
The DC grounding
protection fails.
Important
1. The negative terminal of the
inverter is not reliably grounded.
2. Check whether the negative
grounding fuse is blown.
AC fuse fault
The fuse on the
AC side of the in-
verter fails.
Important
Check whether the AC fuse is
normal.
Grid voltage
imbalance
Grid voltage is
unbalanced.
Important
Measure the grid voltage and
check for any imbalance.
Current Imbal-
ance 2/Current
Imbalance 3
The alternating
current is
unbalanced.
Important
Measure the grid voltage and
check for phase loss.
AC cabinet
over-
temperature
The temperature
of the AC cabinet
exceeds the pro-
tection threshold.
Important
1. Check whether the fans inside
the AC cabinet work normally.
2. Check whether the air inlet of
the AC cabinet is blocked.
3. Check whether there is dust in
the air inlet of the AC cabinet.
Clean it if necessary.
DC fuse
anomaly
The fuse on the
DC side of the in-
verter fails.
Secondary
Check whether the DC fuse is
blown.
If so, please contact SUNGROW
to replace the fuse.
10 Troubleshooting System Manual

Sungrow MVS4480-US Specifications

General

Brand	Sungrow
Model	MVS4480-US
Category	Inverter
Language	English