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· Donuts > Fried Eggs
17,035 Posts
I dont highly recommend using a vfd to drive a fan, or blower
due to the fact that loss of power will result in feedback from the magnetic field collapse will create a massive and catastrophic spike back through the vfd and frying it...
I don't follow. How does turning off a blower differ from turning off any other motor load?

You never disconnect the load side of a running VFD regardless of what it's connected to.
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