KMG Grinder VFD power issues

Well yeah, it's not going to work if you tell it you're giving it 220 input, when it's on 110 input.


I would contact Rob at Beaumont, you may simply have a bad motor or drive. This seems especially likely, since reading back to your original post you're stating that it works fine again at a higher RPM than where it gets problematic.
 
javand said:
Well, you can test the electrical concern by making sure everything else on the same circuit is turned off.

Afaik it shouldn't matter if you've got the jumper set to 1.5hp or 2hp, it's just a limitation of how much current the VFD will pull with 110 input.

Yes, wiring up a 220V circuit to the VFD will give you more HP, and the gain from 1.5-2hp isn't insignificant.


Did you purchase this motor from Beaumont or on your own?
Click to expand...

Are you sure about this? Any current limiting device was clearly marked as Current limiting and to be set at a specific value but maybe this is just the user friendly way of doing it.
 
I've read a lot of stuff from other forums aswell. A lot of people say you run into current issues with 120 and a 2hp motor
 
So when then motor is on powered on with the start stop in the stop position the warning light is steady red. Which based on the manual online says it's running overload 120-160% I dunno if that's normal or not
 
Alright, well I emailed KMG. Immediately got a response and went back and forth. He said I needed to set the boost pot to manual control and adjust it. He said it was due to there being not load on the motor at all and basically the VFD over and undercompensating. Getting my belts in hopefully tomorrow. But adjust the pot definitely did make a big difference. Its still not perfect but I am hoping the load issue is what it is.
 
Oh yeah, they will run erratic with absolutely nothing on them.


Guess I missed the part where you mentioned that was the case.
 
Some high end VFD have the option to run in open ring or closed ring mode, that's to say variable or constant torque depending on the rpm.
If that is the case you want the open ring mode set up, which is less demanding in terms of Amps. The closed ring mode is used in slow rpm high load applications, so high rpm will suck a ton of amperes to provide the same torque while spinning so fast.
 
This has the option to adjust boost pot manually or automatically. Thanks for knowledge that no load effects the vfd
 
You must log in or register to reply here.
Back
Top