Altivar 32/320 SCF1/3 Fault

NeiB · ‎2024-10-31

Hi,

Does anyone know which are the values for SCF1/SCF3 to trip in fault?

Our customer is facing problems with motor insulation damage due to water infiltration. It seems that his ATV32 trips on fault SCF3 but at this point the motor is damaged beyond repair.

I believe on this case the first fault should be SCF1 but I am not quite sure as I could not find the characteristics of this fault.

Customer mentioned that he has ABB devices that does trip before the motor is damaged, but ATV32 does not.

Thank you.

Nei

Ahmed_Alzafer · ‎2024-11-19

Hello

SCF1 is a short-circuit event.
Except for a real short circuit event at the Alivar drive output (motor, motor cables) , the SCF1 can have another reason:
- high magnetizing current (motor saturated),
- low motor inductance (real vs measured),
- lack of symmetry in the motor circuit,
- motor cabling issue, or
- the motor itself.

while SCF3 This is a ground Short Circuit fault.

both faults will stop the drive operation.

See Answer In Context

Ahmed_Alzafer · ‎2024-11-19

Hello

SCF1 is a short-circuit event.
Except for a real short circuit event at the Alivar drive output (motor, motor cables) , the SCF1 can have another reason:
- high magnetizing current (motor saturated),
- low motor inductance (real vs measured),
- lack of symmetry in the motor circuit,
- motor cabling issue, or
- the motor itself.

while SCF3 This is a ground Short Circuit fault.

both faults will stop the drive operation.