120
Display
Cause
Where to check and how to take
actions
Reference
The output electrical wire was
short circuited or grounded.
Check the wiring of the output
electrical wire.
3.3 How to Connect
Converter
IGBT may be damaged.
Check whether IGBT of the converter
works properly or not (continuity
check).
DC voltage command is too high or
too low.
Review the DC voltage command.
Load capacity is abnormally
large.
・
Reduce load.
・
Check and review the converter
model.
The gate board <GAC66>
malfunctions.
Replace the gate board <GAC66> of
the converter.
* A character in the second digit from the right distinguishes a master unit (n) from slave units
(1, 2, and 3).
* A number in the rightmost digit shows the L1/R phase (1), L2/S phase (2), and L3/T phase (3).
Display
Cause
Where to check and how to take
actions
Reference
The cooling fan of the converter
stops or its air volume is
decreased due to failure or
malfunction.
Replace the cooling fan.
7.3 How to Replace
Cooling Fan
The wind of the cooling fan of
the converter blows in the
reverse direction.
Install it so that the wind blows
in the correct direction.
7.3 How to Replace
Cooling Fan
Ambient temperature is high.
Check temperature in the
installation environment (such as
temperature inside the control
panel) for ventilation.
3.1.2 How to
Install Converter
Cooling space of the converter
is not enough.
Keep enough cooling space around
the converter.
3.1.2 How to
Install Converter
The installation direction of
the converter is not correct.
Install it in the correct
direction.
3.1.2 How to
Install Converter
The heat sink temperature sensor
malfunctions.
Measure resistance of the heat
sink temperature sensor.