88
Fault
name
Explanation
Fault
severity
Measures
Ground
Fuse flt
Grounding fuse is
abnormal.
Minor
Wait the capacitor to discharge
completely, and then remove the negative
grounding fuse. Check whether the fuse
has blown.
If so, check whether the neutral point of
the transformer is unconnected, and
whether the neutral point of the PT/CT on
the LV side of the transformer is
grounded.
Meter-
com-flt
Communication
of the energy
meter is
abnormal.
Minor
1. Check whether communication cables
connected to the energy meter and
metering board are damaged.
2. Check whether communication
terminals of the energy meter and
metering board are securely fastened.
DC fuse-
abnormal
DC fuses of the
inverter are
abnormal.
Minor
Check whether the DC fuse have blown.
If so, contact Sungrow and replace the
fuses.
Branch
Fuse flt
Branch fuses of
the inverter are
abnormal.
Minor
Refer to the measures for "DC fuse-
abnormal".
RISO flt
The insulation
resistance is
excessively low.
Minor
1. Check whether insulation layers of
positive and negative DC cables to
ground are damaged.
2. Check the insulation resistance to
ground of AC three phases.
3. Check the connection of the neutral
point on LV side of the transformer to
ensure the neutral point is not grounded.
Freq shift
Watt adj
The active power
of the inverter is
adjusted
according to the
change of grid
frequency.
Warning
Check, via the LCD, whether the over
frequency derating function is enabled.
If the function is enabled, it indicates over
frequency occurs during the operation.
System Manual
