Belt grinder noise - pulling my hair out!

This issue seems to come up every couple of years, and more often than not it ends up being the VFD/motor pairing. The noise is called "cogging", and it's typically worse at lower frequencies.

Are you using a KBAC vfd? If so, I suspect your jumper is set for CT (constant torque). Set it to VT (variable torque) just for grins and giggles and see if your noise goes away. Unfortunately, this won't exactly fix your issue, as you'll lose all lower frequency torque, but you will at least have narrowed the problem down to vfd cogging.
 
I would call KB electronics support... They have good support and can walk you through what to do.
 
Crag the Brewer said:
I meant how the motor is wired. If you look it's capable of 2 versions
208-230 or 460 volts

Your drive's output is going to be one of those usually

and you wire the motor accordingly
Click to expand...

FWIW: the contoller is a KBAC-27D. I cannot find any setting for changing the output voltage (other than boost POT).

Beaumont Metal Works pre-wired the motor.

Thanks Drew Riley Drew Riley for the nailing the issue. "Cogging" It's nice to know it's not a mystery disease and something solvable.

I think I have it solved!!!

It was the horsepower setting.

At 120VAC the controller can only go to 1 1/2hp. But the HP jumper was on the 2HP setting. So even tho it's a 2HP motor, the controller has to be throttled back for 120.

In my defense, I had the 120/208 jumper set correctly. But didn't change the HP setting because I thought it had to match the motor.
 
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