KMG Issues. Please help.

Z

Z Bacon

Joined
Aug 3, 2011
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106
Lately, my KMG belt grinder has been acting up. When I turn on the power it lights up green like everything is fine, but when I start it up it is either sluggish and jumpy or it doesn't move at all. Any advice or input would be greatly appreciated.
 
Z Bacon said:
Lately, my KMG belt grinder has been acting up. When I turn on the power it lights up green like everything is fine, but when I start it up it is either sluggish and jumpy or it doesn't move at all. Any advice or input would be greatly appreciated.
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I am at a little loss here as I have a clone. When you say it "lights up green" are you referring to a a variable speed control? Are you referring to the motor itself? Maybe a pic of your setup would help to diagnose the problem!!! At the very least its going to take a little more info to help you! Rob over at Beaumont might be your next bet. He's good people!
 
We need lots more info



What motor

single speed, or variable speed

what controller

any trouble indicator lights ?

are you starting it with the speed control knob all the way down, instead of mediium to high, to max?
 
It is variable speed, yes. The control box has a power and a status indicator. The power indicator will light up green meaning there is power going to the grinder, but it won't run properly. I will call Beaumont during the week, when they are available.
 
I believe it is a 1.5hp motor.

Variable Speed.

VFD Controller.

No trouble indicator lights.

I've tried starting it with the speed control knob in all those positions.
 
Im not familiar with kmg i use a bader but im very familiar with belt driven vfd equipment that just screams loose belt
 
Check all your connections, sounds like it is trying to run on 2 legs. Your VFD output might dropping a leg also. Rob might be able to help you a bit better though.
 
I lean towards what Chuck's saying. Pull the cover on your motor's wiring connections for a loose wire nut.

If you are competent with electricity you can check each leg coming from VFD for proper voltage being delivered.
 
An update on the problem: It seems that my grinder will start up and run perfectly fine for 15-30 minutes, but it will then stop and almost sputter, like an engine that is almost empty. The belt moves in quick jolts and the motor makes a high pitch but low volume noise. Almost like a whistle but not very loud. I'll try to get a video of the problem today.
 
My delta belt sander is dying. When I turn it on it cannot get the belt turning, I have to use my hand to push the belt, to kickstart it. Once it gets moving the motor will somehow be able to take over and get it up to speed.
You could try to kick start the belt with your hand. If that gets it moving then maybe you have the same problem as me... one which I haven't figured out yet
 
Ok I just looked at your video now let me ask a few questions.

Is this a KMG from Beaumont? If so contact them Rob is a real good guy, he even answered questions for me when he knew I was building a clone.

Do this is if you want to localize the problem. Disconnect the power from the VS control and hook it up temporarily direct to the motor and check it out if it runs too full speed without problem its in the VS control some where!

I am going to assume this is a 110-120Volt set up. The one thing that caught my eye is the cord you are running it off of it doesn't look very heavy. The heavier duty the cord is the better when not plugged directly into a receptacle.

I need a little more info on the system to be able to help even with the video!
 
eyeeatingfish said:
My delta belt sander is dying. When I turn it on it cannot get the belt turning, I have to use my hand to push the belt, to kickstart it. Once it gets moving the motor will somehow be able to take over and get it up to speed.
You could try to kick start the belt with your hand. If that gets it moving then maybe you have the same problem as me... one which I haven't figured out yet
Click to expand...

Sounds like you have either a weak field or it may have a starting capacitor going out. If its the first its dying a slow death! Once the field gets burnt on the motor the windings start to coat over and the whole thing arcs inside like crazy and they usually ain't long for this world. If its a starting capacitor its a cheap fix usually!
 
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