Nidec & Control Techniques Unidrive M700, M600, M400, HS30 & HS70 Drive
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Apr 13, 2024 5:05 am
Cause : Control stage over temperature- This OHt Control trip indicates that a control stage over-temperature has been detected. From the sub-trip ‘xxyzz’, the Thermistor location is identified by ‘zz’.
| Source | xx | y | zz | Description |
| Control system | 0 | 0 | 1 | Control board thermistor 1 over temperature |
| Control system | 0 | 0 | 2 | Control board thermistor 2 over temperature |
| Control system | 0 | 0 | 2 | I/O board thermistor over temperature |
- Check enclosure / drive fans are still functioning correctly.
- Check enclosure ventilation paths.
- Check enclosure door filters.
- Increase ventilation.
- Reduce the drive switching frequency.
- Check ambient temperature.
