143
Console LED display
Cause
Where to check and how to
take actions
Reference
<P side> <N side>
1. The main cooling fan of the unit
stops, or its air volume is
decreased due to failure or
malfunction.
Replace the main cooling
fan.
2. The wind of the main cooling
fan of the unit blows in the
reverse direction.
Install the main cooling fan
so that the wind blows in
the correct direction.
3. Ambient temperature is high.
Check temperature in the
installation environment
(such as temperature
inside the control panel)
and ventilate.
[Contents]
<This function is applied
to models 7522, 7544 and
higher, and the unit
parallel models>
It starts when the
temperature of the cooling
heat sink of IGBT in the
unit becomes more than
or equal to a specified
value.
* A character in the third
digit from the right
distinguishes a master
unit (n) from slave units
(1, 2, and 3).
* The rightmost digit
indicates whether it is P
side (1) or N side (3).
4. The cooling space of the unit is
not enough.
Keep enough cooling
space around the unit.
5. The installation direction of the
unit is not correct.
Install the unit in the
correct direction.
6. The cooling fin temperature
sensor malfunctions.
Measure resistance of the
cooling fin temperature
sensor.
