Chapter 13 Warning Codes
ME300
No. Display on LED Keypad Warning Name Description
9
IGBT over-heating
warning (oH1)
The AC motor drive detects over-heating of IGBT, and
over the protection level of oH1 warning. (When Pr.06-
15 is higher than the IGBT over-heating level, the drive
shows oH1 error without displaying oH1 warning.)
Action and Reset
Action condition Pr.06-15
Action time
“oH1” warning occurs when IGBT temperature is higher than Pr.06-
value.
Warning treatment parameter N/A
Reset method Auto-reset
Reset condition
The drive auto-resets when IGBT temperature
is lower than oH1 warning level
minus (–) 5°C.
Record N/A
Cause Corrective Actions
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 braking
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 the loading.
2. Decrease the carrier.
3. Replace with a drive with larger capacity.
The drive has run 100% or more
than 100% of the rated output for
a long time.
Replace with a drive with larger capacity.
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