[GreenKeys] Need wiring sheet of a WU M15TTY Base

[John Nagle]

On 8/4/2013 9:00 AM, greenkeys-request at mailman.qth.net wrote:
> Message: 1 Date: Sat, 3 Aug 2013 11:21:28 -0700 From: "Norm"
> <normand3 at q.com> To: <greenkeys at mailman.qth.net> 
> Subject: Need wiring sheet of a WU M15TTY
> 
> Hi I am in need of  a wiring sheet of a WU M15 base I think the base
> number is 192462, that number is on a tag on the left side of the
> base , and also would like a Parts book or PDF of one. 

    The manuals are all online on various sites. I
have them at

	http://www.aetherltd.com/manuals.html

> My problem is
> if I plug the unit in to a "ground fault outlet it will pop the
> device.  There is a  Western Electric square metal box mounted on the
> right side of the base right above the 26 terminal block.  The square
> metal unit has two capacitors with a ground connection, the two caps
> four wires are wire thru each side of the AC cord to the motor.

   That's RF noise bypassing.  It's not essential for synchronous
motors, although they generate some RF hash at startup when
the starting switch opens. Governed motors will blither all
over the RF spectrum without those capacitors.

> I do have a high resistance to ground with each capacitor.  I put a
> current meter on the wires, and it looked like a 3.3 amp spike then
> right down to 2 amps plug in to normal outlet, I think the spike is
> popping the "ground fault outlet or the Capacitors are going bad.

    You have a ground fault somewhere.  I run all my M14 and M15
machines through GFCI protectors.  The only time I've had a trip
was when an old Holtzer-Cabot motor in an early-model M14 arced
to its frame with a loud pop.  The GFCI shut down everything
just as it should.  After I used compressed air to clean out
the motor, it ran fine.

    If you're measuring a non-infinite resistance to ground,
you have a ground fault.  Probably a bad RF bypass capacitor,
although it could be a problem within the motor.

    I rewire all my machines with modern 3-wire power cords and
connect the green wire to the frame, so if there is a short
to the frame, fuses, breakers, and GFCIs will catch it.  This
is basic electrical safety.

				John Nagle