86
Fault
name
Explanation
Fault
severity
Measures
Gnd-flt
Grounding fault.
Major
1. Check the DC cables.
Check whether positive DC cables
connected to the ground are damaged.
Check whether the impedance to ground
of the DC cable is normal.
2. Check the AC cables.
Check whether voltages to ground of all
the three phases are the same. In
addition, check whether SPDs on the
inverter side and transformer side are
damaged.
AC
Switch flt/
AC
breaker
flt
The AC switches
are faulty.
Major
1. Check whether AC switches have
tripped.
2. Check whether AC switches are
damaged.
3. Check whether AC switches are
connected/disconnected normally.
4. Check AC switches for conductivity
with a multimeter.
Radiator
over
temp
The temperature
of the heat sink
inside the
inverter is
excessively high.
Major
Check whether the fans are normal. If the
fans are normal, check whether the air
ducts are obstructed.
DC fuse
flt
DC fuses are
abnormal.
Major
Refer to the measures for "DC fuse-
abnormal".
GFDI pro
DC grounding
protection is
abnormal.
Major
1. The negative pole of the MV Station is
not securely grounded.
2. Check whether the negative grounding
fuses blow.
AC fuse
flt
AC fuses are
abnormal.
Major
Check the AC fuses.
Grid_V_
unbalan-
ced
Grid voltage is
unbalanced.
Major
Measure the grid voltage, and check
whether grid voltage unbalance exists.
System Manual
