"Karl Townsend" wrote in message
...
Packing line upgrade time...

My bin dump water pump is the largest noise maker in the system. I
quickly tried a VFD a couple years ago and it SQUEALED far worse than
the excess motor noise. Just as pleasant as listening to chalk squeal
on a blackboard.

Anyway, this time I want to buy a 1/2 hp VFD that doesn't have carrier
wave noise. Suggestions? BTW, the unit will be located 75' of wire
from the motor. Is a reactor needed in this case?

Karl


What is the actual source of the noise?

I run a 1/2HP VFD and 5HP VFD in the high power side cabinet on my Hurco,
and both are virtually silent. The servo dithering is louder than either
one.