Nidec & Control Techniques Unidrive M700, M600, M400, HS30 & HS70 Drive
1
Posts
1
Users
0
Reactions
495
Views
Apr 13, 2024 5:12 am
Cause : Inverter over temperature based on thermal model comes when an IGBT junction over-temperature has been detected based on a software thermal model.
The sub- trip indicates which model has initiated the trip in the form xxyzz as given below:
| Source | xx | y | zz | Description |
| Control system | 0 | 1 | 0 | Inverter thermal model |
| Control system | 0 | 3 | 0 | Braking IGBT thermal model |
- Reduce the selected drive switching frequency.
- Ensure Auto-switching Frequency Change Disable (05.035) is set to Off.
- Reduce duty cycle.
- Increase acceleration / deceleration rates.
- Reduce motor load.
- Check DC bus ripple.
- Ensure all three input phases are present and balanced.
