[CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet

Mabe try measure the phase shift and add a bigger cap to correct the power
factor. Maybe the exisiting cap is faulty.

Regards
Roland

On 6 November 2012 21:14, Scott A Tovey <satovey@...> wrote:

> **
>
>
> Test it with a different GFI outlet.
>
> It is possible that the GFI is bad, additionally,
> verify that the GFI is rated for the amps that
> the motor is pulling at full power.
>
> You should also test how many amps the motor is
> pulling at it's various RPMs. That in itself
> will tell you if the motor is wearing out.
>
> When was the last time you lubed the motor
> bearings? If they are dry, the drag will
> cause the motor to pull additional amps
> at a given RPM.
>
> Scott A. Tovey
>
> --- On Tue, 6/11/12, Don <Don@...> wrote:
>
> > From: Don <Don@...>
> > Subject: [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Date: Tuesday, 6 November, 2012, 12:01 PM
>
> > 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?
> >
> > Don
> >
> >
> >
> > ------------------------------------
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