Today is...
Saturday, March 23, 2019
Welcome to Control.com, the global online
community of automation professionals.
Featured Video...
Featured Video
A tutorial introduction to programming using the QuickBuilder Programming Environment.
Our Advertisers
Help keep our servers running...
Patronize our advertisers!
Visit our Post Archive
EMC/EMI Filter Question
Does an EMC/EMI filter go before the VFD or after the VFD?
By Kevin Flora on 10 January, 2019 - 9:58 pm

Does an EMC/EMI filter, like https://www.valinonline.com/products/508-110, go before the VFD or after the VFD on the cable that goes to the spindle? Also, if I use a filter on the output side of the VFD, would this protect both the VFD and the motor?

regardless of manufacturer EMC/EMI are used in the input side of VFD. Mainly to decrease high frequency interference from both supply side & VFD side to interact with normal operation.

The filter on the output side of the VFD doesn't protect both, no VFD and no motor - it decrease EMC/EMI level produced by VFD itself simply.