VFD and Motor Help

H

Hathenbruck

Joined
Dec 30, 2018
Messages
57
I'm sure this has been beaten to death, but I can't seem to find an answer anywhere, so here it goes...

I just upgraded to a KBAC 27-D and Leeson 2HP 3600 rpm combo, from a 1HP 1800 Harbor Freight motor. I just got the new VFD and motor hooked up to 220v, adjusted all my jumpers and trimpots to what I think they should be. I went to do my first bit of grinding on the new setup, and this thing feels like it's a 1/2HP motor. I have a 7" drive wheel that I used on my Harbor Freight motor, and it took a lot to pressure to stop that thing. I put that 7" on the new setup, I barely apply pressure, and I can easily stop the belt. I put my 4" drive wheel on the new setup, and it does a little better, but I can still pretty easily stop the belt.

I verified that I have 110V to each lead, and I'm hooked up to the motor for high voltage.

Does anyone know what the issue may be?
 
One issue is that 3600rpm motors have half the torque as 1800rpm motors. Been a while since I've been in the VFD industry, but will see if I can find anything else.
 
Thanks for the reply! I've read that people will get the 1800rpm and use the 2x jumper in the VFD, but I figure with twice the HP as what I had, I'd at least be close to my old motor in the amount of pressure I could apply to the belt.
 
Is the J10 jumper set to Constant Torque?

If it had a V/Hz ratio setting I would have you try setting it so that you get full output voltage at 30Hz instead of 60Hz, as that would double the torque up to half speed, but that VFD doesn't seem to have that setting.
 
I'll go check again, but I'm almost positive it's set to CT. I know there's a 50hz and 60hz jumper, which it's set to 60hz. If there's nothing wrong with the setup, I can't imagine anyone using this motor for knife making. it's pretty bad.
 
Can you take a pic of your trim pots and jumper settings? Chances are you've got your torque jumper on VT. It should be on CT.
 
Drew Riley said:
Can you take a pic of your trim pots and jumper settings? Chances are you've got your torque jumper on VT. It should be on CT.
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Are you able to see these photos?

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What are the A-E jumpers? I think that jumper corresponds to HP settings on older models, but usually it has a number value. Does A correspond to your motor's HP?
Everything else looks to be in order, assuming your motor is wired for 220 and everything is right and tight.
 
Drew Riley said:
What are the A-E jumpers? I think that jumper corresponds to HP settings on older models, but usually it has a number value. Does A correspond to your motor's HP?
Everything else looks to be in order, assuming your motor is wired for 220 and everything is right and tight.
Click to expand...
yeah. A-E Corresponds to a HP value. A is 2HP on the 27D, if wired to 220. I tested my input leads, and each is showing 110.
 
This may sound like a dumb question, but do you get 220 when you meter across both? You're sure you have the motor wired for "low" voltage as well?
 
Oh wow! That didn't even cross my mind. For some reason I was thinking 110 for Low and 220 for high. ok...Be right back :)
 
Lieblad said:
Yes, wire the motor for low voltage.
That puts in its 230V range.
If its wired for highvoltage, (460V)it only produce roughly 25% of the power its otherwise supposed to.
Click to expand...

Good catch...not sure why I didn't think of that
 
That did it!! Runs the 4" wheel like a champ, but the 7" wheel doesn't want to get going. Speed surged a few times, then it stopped. I can't thank you enough for your help. This was so aggravating.
 
Hathenbruck said:
That did it!! Runs the 4" wheel like a champ, but the 7" wheel doesn't want to get going. Speed surged a few times, then it stopped. I can't thank you enough for your help. This was so aggravating.
Click to expand...
Glad you were able to get it going. As for the larger drive wheel, you may just have to play with the trim pots until you get something that works. That's going to be a bit more mass for the motor to accelerate up to speed. You might try rolling the COMP pot back a bit and see if that helps or hurts. Upping the CL pot may also help a bit, but I'd play with COMP first.
 
I'm probably just going to grab a 5" drive wheel. I bought the 7" just to get some more speed out of my 1800rpm. I really appreciate your help! I owe you one.
 
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