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

He's got to be - a 110K resistor in series with the motor would limit
current to 0.7 mA (at 80 volts), so the motor wouldn't turn at all.

- Steve

Andy Wander 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@...]
>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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