Protecting a VFD from another VFD malfunction

PLCnovice61 · Sep 20, 2019

Thank you jraef for your time and effort in supplying another great explanation.

drforsythe · Sep 23, 2019

Great explanation, jraef!

CLanford · Sep 23, 2019

Thank you JRaef for that explanation.

Based on everything you've said and what I've researched so far, it seems that line reactors are going to be the way to go.

Thanks again!

CLanford · Sep 23, 2019

jraef said:
Now that said, using the 10x rule, you can get a sufficient protective effect by grouping multiple VFDs behind one line reactor, so long as that reactor size stays within the 10x rule for the smallest drive behind it.

With that being said, I'm trying to reduce the possibility of this cascading destruction again. I'm assuming it would be a more robust solution to have a line reactor for each drive vs. grouping multiple drives behind one reactor?

Gene Bond · Sep 23, 2019

Yes. Each would have its own 'safety net', rather than one 'net' for a group.

jraef · Sep 23, 2019

Gene Bond said:
Yes. Each would have its own 'safety net', rather than one 'net' for a group.

Agreed. I was just providing alternatives in case that was untenable.

Duranthas · Sep 24, 2019

Thank you jraef, that was really great information. This gives me a lot to think about regarding future installations, and worry about from past installations.

Protecting a VFD from another VFD malfunction

PLCnovice61

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