KMG VFD 220 volt problem

H

hd28doc

Joined
May 14, 2010
Messages
3
Just got a KMG with a 2hp 220-volt with VFD. Hooked everything up today. I find that the motor runs VERY hot and that it only runs at around 30%. Any higher and the red overload light comes on.

Anyone run into this before?

Everything was set up just as directed on the KMG website. I've got 2 120-volt lines coming in. Is this too much or is something set up wrong on the VFD?

Any ideas?

Thanks in advance.
 
Wait...do you mean you have a single 220v line coming in with two hot legs, or two separate 120v lines cooing in....:confused: :)

I'd consider giving Rob a call. He should be able to help pin it down if you don't get an answer here. A suggestion would be to describe exactly how you've got things wired so that people familiar with your VFD can make an educated response.

Good luck!

--nathan
 
a single 220 line with 2 hot legs but the total voltage would actually add up to 240 volts.

I intend to give Rob a call but am not sure when I'll get a chance to do that during business hours... probably not until next week.
 
Is the motor wired properly for 230V? If you wired it for 460V it could be getting improper power to the windings. Check 3x that you have ALL the proper leads doing what they are meant to do. Wether they be going to the inverter or just capped off, or attached to each other.

At 230V 3PH it's usually

T1-T7-U
T2-T8-V
T3-T9-W
T4-T5-T6

T being motor terminals and U,V,W being the 3 phases from the VFD.
Power should be on L1 and L2, polarity doesn't matter in 1PH for this.

A lot can be wrong in the setup of a VFD if you're inexperienced with them.
 
Ditto on checking the tie-ins at the motor. It is easy to make a mistake here. The T4,5,6 are connected together.

Another thing. Is your grinder setup's pulleys in the correct range? When I put a 2hp 3 phase and VFD on my mill to
replace the regular 2hp motor it would do that if I set the pulleys up for real high speed.
 
I think every has covered the basics here. My first suspicion is that the motor is incorrectly connected.

Here are a few resources on our web site:

Wiring diagram: http://beaumontmetalworks.com/motors/VFD-WIRING.gif

Tutorial: http://beaumontmetalworks.com/VS-setup.html


The bottom line on your input power (220V) ...is that you should be able to put a voltmeter across L1 and L2 on the terminal board of the VFD and read 220-240V or so.

If you run into a bind, call me in the shop when you are at the bench and we can go through everything wire by wire.

-Rob
 
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