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

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@...]
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
>