Chapter 13 Warning CodesMS300
480
IGBT over-heating
warning (oH1)
The AC motor drive detects IGBT overheating and
exceeds the protection condition of oH1 warning.
(When Pr.06-15 is higher than the IGBT overheating
protection condition, the drive shows oH1 error without
displaying oH1 warning.)
“oH1” warning occurs when IGBT temperature is higher than Pr.06-15 setting
value.
Warning Setting Parameter
The drive auto-resets when IGBT temperature is lower than oH1 warning level
minus (–) 5°C
Check if the ambient temperature
or temperature inside the cabinet
is too high, or if there is
obstruction in the ventilation hole
of the control cabinet.
1. Check the ambient temperature.
2. Regularly inspect the ventilation hole of the control cabinet.
3. Change the installed place if there are heating objects, such as brake
resistors, in the surroundings.
4. Install/ add cooling fan or air conditioner to lower the temperature inside the
cabinet.
Check if there is any obstruction
on the heat sink or if the fan is
running
Remove the obstruction or replace the cooling fan.
Insufficient ventilation space
Increase ventilation space of the drive.
Check if the drive matches the
corresponded loading
1. Decrease loading.
2. Decrease the carrier wave.
3. Replace with a drive with larger capacity.
The drive has run 100% or more of
the rated output for a long time
Replace with a drive with larger capacity.
oH Warning
oH1 Warning = Pr.06-15 (ºC )
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