RE: [CAD_CAM_EDM_DRO] Re: new stepper motors wiring mess...

Ok, well that part will work then. One more potential problem down!

Andy Wander
Verrex Corporation


-----Original Message-----
From: Keith Clark [mailto:mail@...]
Sent: Saturday, August 28, 2004 4:13 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: new stepper motors wiring mess...

No, the resistors are not connected to the motor wirings but are
placed as instructed on the two current limiting terminals on the
Gecko drives specifically dedicated to setting the current to be
drawn by the motors. At least I know they are in the correct place -
one of the few things I am totally sure of.

Keith

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Andy Wander <awander@v...>
wrote:

> Keith:
>
> You are wiring the "current limiting" resistors to the terminals

on the

> Gecko, and not in series with the motor wiring, right? I think

that is what

> erie was referring to. The resistors should NOT be in series with

the motor

> leads.
>
> Andy Wander
> Verrex Corporation
>
>
> -----Original Message-----
> From: Keith Clark [mailto:mail@t...]
> Sent: Saturday, August 28, 2004 2:33 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: new stepper motors wiring

mess...

>
> Erie, I have read the paper and discussed in detail the wiring,
> jumpers, capacitor, resistor size, Nema 42 jumper, multiplexer
> settings, standby, frequency compensation, slow speed pot
> adjustment - etc with Mariss at Gecko and still not working. I

have

> motors rated when wired "Series Bipolar" of 4.9 amps. Using the
> calculation in the Gecko manual requiring 110 kOhm current

limiting

> resistors. With the original Bridgeport motors I had been using
> 340KOhm resistors as set by Mariss and he finally said the motors
> were bad. Now about $2000 later and I am in the same boat. Any
> ideas would be appreciated as I am a sponge at this point.
>
> Keith Clark
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, erie <erie@s...> wrote:
> > ok, start from the beginning, are you saying you have resistors

in

> > series with the motors??
> >
> >
> > If so, Geckos are "Chopper" type drives, they limit current and
> any
> > additional resistance
> > will give you exactly the symptoms you describe. Download the
> white
> > paper from the
> > gecko site, print it out and READ IT!!!! Use the appropriate
> current
> > setting resistors on the drive and
> > then let us know how you make out.
> > erie
> >

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