Nidec & Control Techniques Unidrive M700, M600, M400, HS30 & HS70 Drive
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Apr 13, 2024 5:17 am
Cause : Power stage over temperature - This trip indicates that a power stage over-temperature has been detected.
From the sub-trip ‘xxyzz’, the Thermistor location which is indicating the over-temperature is identified by ‘zz’.The thermistor numbering is different for a single module type drive (i.e. no parallel board fitted) and a multi-module type drive (i.e. parallel board fitted with one or more power modules) as shown below:
Single module type drive:
| Source | xx | y | zz | Description |
| Power system | 1 | 0 | zz | Thermistor location defined by zz in the power board |
| Power system | 1 | Rectifier number | zz | Thermistor location defined by zz in the rectifier |
Multi-module type system:
| Source | xx | y | zz | Description |
| Power system | power module number | 0 | 1 | U phase power device |
| Power system | power module number | 0 | 2 | V phase power device |
| Power system | power module number | 0 | 3 | W phase power device |
| Power system | power module number | 0 | 4 | Rectifier |
| Power system | power module number | 0 | 5 | General power system |
| Power system | power module number | 0 | 0 | Braking IGBT |
- Check enclosure / drive fans are still functioning correctly.
- Force the heatsink fans to run at maximum speed.
- Check enclosure ventilation paths.
- Check enclosure door filters.
- Increase ventilation.
- Reduce the drive switching frequency.
- Reduce duty cycle.
- Increase acceleration / deceleration rates.
- Use S ramp (Pr 02.006).
- Reduce motor load.
- Check the derating tables and confirm the drive is correctly sized for the application.
