76
Fault
name
Explanation
Fault
severity
Measures
lsland/No
grid
Grid blackout
occurs or AC
transient voltage
exceeds the
protective
threshold.
Major
1. Check whether the grid is normal.
2. Check whether power outage occurs
on the AC side.
3. Check whether the AC circuit breakers
of the module are connected.
Ctrol
power
supply flt
The control
power supply is
abnormal.
Major
1. Check whether the control switches of
both the internal and external power
supply are in the ON or OFF positions.
If all switches are in the ON position,
disconnect a switch.
If all switches are in the OFF position,
connect a switch.
2. Check whether the internal and
external power supply terminals are loose
or poorly contacted. Fasten the terminals
when necessary.
Vdc-
samp-flt
The fault of DC
voltage sampling
occurs.
Major
Check, in the Stop mode, whether the
DC voltage displayed on the LCD is
consistent with the voltage actually
measured.
Soft start-
flt
Failed to start the
inverter.
Major
Check whether the grid is normal, for
example, whether the grid harmonic and
grid voltage are balanced.
11 Troubleshooting System Manual
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