Chapter 13 Warning CodesMH300
13-10
ID No. Display 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.06-15
setting 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.
oH1 warning level
Voltage
Model
(NOTE: x＝A or E)
oH1 (ºC)
oH warning
oH1 warning = Pr.06-15 (ºC)
Single-phase
_115V
VFD1A6MH11x□□A□ 95
oH1 warning = oH1 – 5
VFD2A5MH11x□□A□ 100
VFD5A0MH11x□□A□ 100
Single-phase
_230V
VFD1A6MH21x□□A□ 110
VFD2A8MH21x□□A□ 110
VFD5A0MH21x□□A□ 110
VFD7A5MH21x□□A□ 110
VFD11AMH21x□□A□ 110
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