Issue:
What causes tJF or IGBT overheating fault on the Process Drives?

Product Line:
ATV630 and ATV930

Environment:
All

Cause:
IGBT is overheating or fans are not running.

Resolution:
IGBT Overheating Error
Principle
The thermal model of the IGBT thermal monitoring has detected an overheat. This function is protecting the IGBT's.

Probable causes
- Ambient temperature too high.
- Fans not funtioning properly or at all.
- Filter blocked.
- Inadequate ventilation.
- Motor wired incorrectly. Motor leads could be wired to the wrong windings on a dual-rated motor.

Remedies
- Check the motor and load in relation to the drive. Make sure the horsepower and amperage ratings of the motor are not larger than those of the drive.
- Check the ventilation of the Drive and the ambient temperature.
- Reduce the switching frequency

Note: If, for example, motor leads are wired to the 230V windings on a motor when they should be wired to the 460V windings, it can increase current and overheat the IGBT's in the drive.

Released for: Schneider Electric Egypt and North East Africa