RE: [CAD_CAM_EDM_DRO] EMI Rehab (Caps over brushes?)

Abby,
I can't speak to the cap rating; you'll need to research that a bit, this is
important. However, you want two caps. One of them wired between the two
wire terminals, and the other cap wired from one of the terminals to the
case of the motor.

Andrey

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Abby Katt
Sent: Saturday, June 25, 2005 9:01 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] EMI Rehab (Caps over brushes?)


Thanks Tom!

I'm still wondering what to do about placing caps over the sherline's DC
spindle-motor brushes.
Do I just wire a cap over the two power wires, or connect caps to the
brushes themselves?

Thanks!
Abby

>Hello Abby,
>
>
>
>>.Grounding.. foot bones goes the uh.. leg bone, leg bones goes to the..
>>uh uh oh! Okay, so the chassis will be grounded, the EMI filter ground
>>is common to the chassis ground (well, it's connected actually) but what
>>about the parallel port cable? Do I ground the outer shell of that to
>>the chassis, or leave it off? Wouldn't grounding this cause the cable to
>>be grounded at both ends (PC and controller chasis) and therefore cancel
>>out the effect?
>>
>>
>
>Cable shields should be tied to chassis ground at one end only. That
>chassis should be tied to ground via the third wire on your power
>connector, as it would be with the EMI filtered power entry module that
>you are using.
>
>Chassis ground should NOT be the same as signal ground or return,
>although it often is. For example, cars and boats usually use the
>chassis as signal return.
>
>Various cables sometimes use the shield as signal return or ground.
>Avoid cables that do this. An ohmmeter will tell you if the shield is
>connected to any pins. If so, those pins should not be used for signals.
>The pins might just be connected to the shield for diagnostics.
>
>Tom Hubin
>thubin@...
>
>
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sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.

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