Re: Here we go again - more trouble -FIXED

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
> >
> >
> >
> >
> >
> > Addresses:
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