Sungrow MVS4480-US System Manual

72
Fault Name Fault Cause Fault Level Corrective Method
Branch fuse
abnormal
The branch fuse
of the inverter is
abnormal.
Secondary
Please refer to the troubleshoot-
ing method of “DC fuse fault”.
Low insulation
resistance
The insulation re-
sistance is low.
Secondary
Please refer to the troubleshoot-
ing method of “Insulation
resistance”.
DC switch
anomaly
The DC switch of
the inverter is
abnormal.
Secondary
Check whether the branch air
switches are all closed, and
check whether the state of them
is Closed on the interface.
Frequency de-
viation active
power
regulation
The active power
of the inverter is
regulated accord-
ing to the change
of the grid
frequency.
Prompt
Check whether the power reduc-
tion at over-frequency is enabled
on the interface.
If so, it indicates that over-fre-
quency occurs during operation.
Voltage devia-
tion reactive
power
regulation
The reactive
power of the inver-
ter is regulated ac-
cording to the
change of the grid
voltage.
Prompt
Check whether the reactive
power regulation is set to QU
Mode on the interface.
GFRT operation
The inverter runs
through high volt-
age and low
voltage.
Prompt
Check whether the grid voltage
exceeds the set threshold of
HVRT or LVRT.
If the fault/alarm cannot be cleared following the above corrective methods and still persists,
please contact SUNGROW directly.
Fault Name Fault Cause Fault Level Corrective Method
AC switch off
The AC switch is
disconnected.
Important
Please contact
SUNGROW.
Carrier sync flt
The carrier signal transmis-
sion is abnormal.
Important
Please contact
SUNGROW.
Drive board fault
The drive board inside the
inverter fails.
Important
Please contact
SUNGROW.
Parallel machine
communication
failure
The communication inside
the inverter is abnormal.
Important
Please contact
SUNGROW.
10 Troubleshooting System Manual

Sungrow MVS4480-US Specifications

General

Brand	Sungrow
Model	MVS4480-US
Category	Inverter
Language	English