Re: [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet

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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