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Contactor at Drive output


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#1 chaterpilar

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Posted 24 December 2005 - 01:24 PM

Is it neccessary to put a contactor on the output of VSD ?

The freewheeling effect of motor gives feedback to VSD , especially if the VSD is driving a 2 pole pole motor and is stopped but motor keeps running..due to inertia.

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#2 marke

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Posted 25 December 2005 - 11:21 PM

Hello Chaterpillar

Generally, you would not put a contactor on the output of a VSD. Most VSDs will be damaged if you control a contactor on their output. and so it must not be done. There are some manufacturers who claim that you can use a contactor on the output of their drives, but this is not normal.

Best regards,




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