CAD CAM EDM DRO - Yahoo Group Archive

Re: [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet

Posted by Jon Elson
on 2012-11-06 16:51:59 UTC
On 11/06/2012 11:01 AM, Don wrote:
> I have a Leeson 1/4HP PM DC motor on my Taig mill and a treadmill speed control. I only have 5 to 10 hours on the motor, it was new when I acquired it. Yesterday, I was using the mill to cut the heads off some rivets in some bed frame angle iron. Out of the blue, my bench shut down. It turned out that it tripped the GFI outlet. I reset it and started the PC and brought up Mach3, turned on the stepper driver power and moved the mill away from the rivet and then started the motor. Just as it was reaching full speed, it tripped the GFI again. I reset the GFI and this time, only started the motor. I slowly increased speed and again, just as it reached full speed, the GFI tripped again.
>
> I am guessing that one of the brush wires is shorting to ground, but it seems that would cause a blown fuse in the control. There is no moisture involved, so I'm not getting leakage there tripping the GFI. Any words of wisdom before I pull the motor apart?
>
>
It is quite possible that the motor is filling with brush/commutator
dust. Most brush
motors can be easily disassembled to clean the commutator and area around
the brush holders. There usually is a thin plastic insulator that
isolates the
brushes from the frame, it is easy for a buildup of conductive dust to
develop
electrical leakage. It is also possible the spindle drive is developing
leakage
or electrical noise that is fouling up the GFI, or it could be a bad GFI.

Jon

Discussion Thread

Don 2012-11-06 09:01:16 UTC Mill Motor trips GFI outlet Jon Elson 2012-11-06 16:51:59 UTC Re: [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet FocusKnobs 2012-11-06 18:05:40 UTC RE: [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet Larry Hedeen 2012-11-06 21:32:19 UTC Re: Mill Motor trips GFI outlet elko_dude 2012-11-07 07:26:51 UTC Re: Mill Motor trips GFI outlet Stephen Muscato 2012-11-07 07:52:37 UTC Re: [CAD_CAM_EDM_DRO] Re: Mill Motor trips GFI outlet Scott A Tovey 2012-11-07 07:52:41 UTC Re: [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet Gary Click 2012-11-07 07:57:02 UTC Re: [CAD_CAM_EDM_DRO] Re: Mill Motor trips GFI outlet Roland Jollivet 2012-11-07 08:02:46 UTC [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet jeremy youngs 2012-11-07 08:31:12 UTC Re: [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet Roland Jollivet 2012-11-07 09:09:32 UTC [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet FocusKnobs 2012-11-07 10:17:51 UTC RE: [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet Gary Click 2012-11-07 10:24:48 UTC Re: [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet Roland Jollivet 2012-11-07 10:41:48 UTC [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet smik8153 2012-11-07 11:14:30 UTC Re: Mill Motor trips GFI outlet Jon Elson 2012-11-07 18:07:05 UTC Re: [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet Tony Smith 2012-11-07 18:39:46 UTC RE: [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet Nelson Collar 2012-11-07 20:05:18 UTC Re: [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet Randy 2012-11-08 05:18:28 UTC RE: [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet