Technical FAQs

Ask a Question

Can you put an output contactor between the motor and the output of the VFD drive to cycle motor off and on?

Issue:
Can you put an output contactor between the motor and the output of the VFD drive to cycle motor off and on?

Product Line:
Altivar

Environment:
All

Cause:
Contactor installed on the output of VFD drive.

Resolution:
It is not recommended because when the contactor opens while running it can damage the IGBT`s ( output devices ).
This is not a suitable application for starting and stopping a motor that is running.  If a disconnect is required at the motor, an Emergency Stop should be installed with the disconnect so you can stop the drive from outputting voltage, prior to opening the disconnect.

 
Was this helpful?
What can we do to improve the information ?