71
Fault Name Fault Cause Fault Level Corrective Method
Anti-PID power
abnormality
The anti-PID
power is abnormal.
Secondary
1. Check the insulation of AC
cables.
2. Check the AC SPD.
3. Check and make sure that the
neutral point on the LV side of
the box-type substation is not
grounded.
External power
supply
abnormal
The external
power supply is
abnormal.
Secondary
Use a multimeter to measure
and check whether the voltage
of the external power supply is
abnormal.
Branch air
switch
abnormal
The air switch of
the DC branch 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.
CT imbalance
The three-phase
grid current is out
of balance.
Secondary
Check whether the three-phase
AC current is balanced on the
interface.
Grounding fuse
anomaly
The grounding
fuse is abnormal.
Secondary
Remove the negative grounding
fuse after the inverter is fully dis-
charged. Check whether this
fuse is blown.
If so, check whether the neutral
point of the transformer is not
connected and whether the neu-
tral point of PT/CT on the LV side
of the box-type substation is
grounded.
Meter commu-
nication abnor-
mal alarm
The meter com-
munication is
abnormal.
Secondary
1. Check whether the communi-
cation cable of the meter is
damaged.
2. Check the communication ter-
minal of the meter is loose.
DC fuse fault
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.
System Manual 10 Troubleshooting
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