Re: Increasing the speed on Southbend 10-16” Models. Late 1930s-late 1940s.
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I am sorry I was not clear. I am not having trouble. I have a 220v TECO. I was just curious as to why some pre-1990 electric motors would have issue with a VFD.
From: glenn brooks <brooks.glenn@...>
Sent: Thu, Jul 9, 2020 10:06 pm
Subject: Re: [SouthBendLathe] Increasing the speed on Southbend 10-16” Models. Late 1930s-late 1940s.
Iam a little confused as to if reply is related to the original question about increasing speed on SB 10’s, or you have some trouble getting the VFD to work?
Dave, you mentioned your VFD is problematic. Are you asking about a VFD that doesn’t work, or doesn’t increase the required RPMs?
If it doesn’t work, and it is a 110v to 220v TECO, and it trips out and shuts off when you try to start it - there is likely a GCFI plug in your house circuit that is causing the issue. 110v TECO’s don’t work with GCFI plugs. A low voltage signal in the TECO unit fools the GCFI into believing it’s a short and the GCFI trips itself. So replace the GCFI with a standard receptacle and you’ll be good to go.
If it’s a speed issue, then never mind... wouldn’t know what to look at, except possibly something to do with the programming setup.