3 phase motor plate says 200v?

TheArsonSmith

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I'm hooking up a VFD to power a Clausing 1500 lathe. I know this machine was powered by standard commercial 3 phase when I picked it up and tested it, although I don't know for sure if it was 240v or 480v, assumed 240v. There's no other electronics in the lathe except reversing switches. I got my VFD and starting going through the numbers and found this 200v a little confusing. Any help deciphering what numbers I need to put into the VFD would be helpful.

Thanks,
-Bill Warner

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That is a good old American motor. We never used that voltage, at least not in the time period that motor was made in. My best GUESS is that the person setting up the badge stamping machine had a hangover that day and accidentally set up 200 instead of 220, 230, or 240. I wonder how many other motors got the same incorrect badge...
 
I kind of figured as much. I can't seem to find any other information on this motor. I've tried 200v and 240v and both seem to under power the motor some, although I haven't gone through the auto tuneing with the VFD yet. This was all just the initial make the motor turn part of hooking up the VFD.
 
Is the VFD rated for 7.5 HP or more? If nothing else, take it to a local motor shop and have them look at it. They can check out a motor in a few minutes, and might well do it for free. Of course, that one is no lightweight...
 
Something seems off on the motor unless I am reading the nameplate wrong. The nameplate shows 7.5 hp = 5.6 kW, while the kVA rating is 23A x 200V x 1.73 = 4602 kVA. The kVA rating in this case is usually about 1.2 times greater than the brake horsepower.
 
Is the VFD rated for 7.5 HP or more? If nothing else, take it to a local motor shop and have them look at it. They can check out a motor in a few minutes, and might well do it for free. Of course, that one is no lightweight...

Yea, it's a 10HP VFD. For reference I included the VFD tag as an additional picture.
 
Something seems off on the motor unless I am reading the nameplate wrong. The nameplate shows 7.5 hp = 5.6 kW, while the kVA rating is 23A x 200V x 1.73 = 4602 kVA. The kVA rating in this case is usually about 1.2 times greater than the brake horsepower.

did you miss the square of 3?

V * A * √3 = kVA
200 * 23 * 1.73 = 7958.00 seems a bit high...going to 220 or 240 would push it really high.

200 * 23 = 4600

240 * 23 = 5520 closer to the numbers but still not the right formula
 
What kind of tolerance should a motor like this have, if the label was assumed to be right but it was run on standard 208v, 220v or 240v 3 phase is it likely to be ok?
 
That is a good old American motor. We never used that voltage, at least not in the time period that motor was made in. My best GUESS is that the person setting up the badge stamping machine had a hangover that day and accidentally set up 200 instead of 220, 230, or 240. I wonder how many other motors got the same incorrect badge...

Is there a way to reverse engineer this and find out what it should be?
 
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