Re: Here we go again - more trouble -FIXED

Curious what the problem turned out to be?

Jeff

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Keith Clark" <mail@t...>
wrote:

>
> Thanks everyone again, it is fixed!
>
> Keith Clark
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Keith Clark" <mail@t...>
> wrote:
> >
> > Thanks Andy, I am gradually learning the hard way...
> >
> > Keith Clark
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, Andy Wander

<awander@v...>

> > wrote:
> > > And I will chime in, too.
> > >
> > > Disconnect the motor from a known good drive, take the fuse out
> on
> > that
> > > drive, and see if you still get voltage across THAT fuse holder.
> > >
> > > Most people don't realize that in a circuit, if you "open" the
> > circuit, and
> > > current stops flowing, you will measure the entire power supply
> > voltage
> > > across the "opening". This is easily seen by applying

Kirchoff's

> > law, when
> > > you will see that with no current flowing(open circuit) there
> will
> > be no
> > > voltage drop across any of the things that usually drop voltage
> (by
> > I*R), so
> > > the entire Supply voltage must be "dropped" across the open
> circuit.
> > >
> > > This is why switching the Neutral instead of the Hot in AC

power

> > wiring is
> > > not a good idea, with the switch in the Neutral line, there

will

> bo
> > one
> > > White wire on the switch that is at 120VAC(or whatever your
> color
> > code/line
> > > voltage is). Most people look at a white wire as "safe to
> touch",
> > but in
> > > this instance it would not be safe.
> > >
> > > Andy Wander
> > > Verrex Corporation
> > >
> > >
> > > -----Original Message-----
> > > From: washcomp [mailto:jeff@w...]
> > > Sent: Wednesday, October 20, 2004 9:47 AM
> > > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > > Subject: [CAD_CAM_EDM_DRO] Re: Here we go again - more trouble
> > >
> > >
> > >
> > > Keith:
> > >
> > > I picked up this part of the thread rather late so I appologize
> if
> > > someone has suggested this before:
> > >
> > > The problem with troubleshooting a complete system is that a
> > problem
> > > with one part often affects other components making the finding
> of
> > > the bug difficult.
> > >
> > > Try to break the system in half (thirds?). The problem is
> either
> > > with the motor or the drive or the wiring harness. We'll

assume

> > for
> > > now that your drive is good (it's new after all) - oh hell,

lets

> > test
> > > it anyway. Tie the drive to a known working motor and see if
> all
> > is
> > > as expected. OK, now we know it's OK. Test the windings of

the

> > > motor for expected resistance as compared to your good motor
> > > (assuming they are identicle). If the resistance you get is

too

> > > small to accurately measure, tie the coils in series and

measure

> > > across all of them. If this doesn't work (reading still too
> > small),
> > > take a battery and put the windings across it in series and
> measure
> > > the voltage across each winding. They should be the same

(ohm's

> > law
> > > and all that). If this all checks out then the motor should be
> OK.
> > >
> > > If the motor is OK and the drive is OK, that leaves your
> wiring.
> > I'm
> > > not sure how you made up the harness, but likely there's some
> issue
> > > (broken wire, shorted wire, mis-labled wire etc.).
> > >
> > > Might want to check wiring to the fuse holder from the power
> supply
> > > and the fuse/fuse holder while you're at it as long as
> everything
> > is
> > > disassembled anyway. It's consivable that the issue is there :-

)

> > >
> > > Hope this helps,
> > > Jeff
> > >
> > >
> > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Keith Clark"
> <mail@t...>
> > > wrote:
> > > >
> > > > I thought that the voltage reading across the open fuse

holder

> > > > suggested a problem and did not know that that was normal.

At

> > any
> > > > rate, I disconnected the motor and still found the same
> voltage
> > > > reading across the open fuse holder. So at that point I
> reasoned
> > > > that there must be something wrong with the connector from

the

> > > Gecko
> > > > and replaced it. Then the reading across the fuse holder

went

> to
> > > > zero! However, this was done without the capacitor installed
> > > across
> > > > terminals 1 and 2. Does it seem possible that the connector
> > could
> > > be
> > > > bad? I did not see any stray strands of wire and could not
> > measure
> > > > any shorts between the terminals of the connector. Possibly
> the
> > > > capacitor in place makes a difference? I did replace the
> > capacitor.
> > > >
> > > > Thanks
> > > > Keith Clark
> > >
> > >
> > >
> > >
> > >
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