Re: servo brake problem

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Doug Chartier <doug@c...>
wrote:

> At 10:33 AM 8/27/2004, you wrote:
> >Doug, I am not sure how the brake works. There is a solenoid that
> >is air activated, but I do not know what the solenoid does. The
> >other two solenoids positioned next to the brake solenoid are
> >functioning and allow air to pass through to affect a spindle speed
> >change. I assume the air pressure is required since the brake
> >releases when I disconnect the air line. My problem is turning off
> >the brake without having to disconnect the compressor. Does that
> >shed any light?
>
>
> Keith,
>
> Sounds like the way mine works. It is extremely air pressure

sensitive,

> however. When I crank up everything, I have to turn on several

things -

> the air compressor ball valve, the valve on the BP air system and

the

> controller. My air compressor and cloths dryer share the same wall
> plug. Un plug one and plug in the other. Since I use the a/c

more than

> the dryer it isn't unusual that I forget to plug the a/c into the

wall plug.

>
> Air bleed off isn't bad on my compressor, but with the combination

of

> forgetting to plug the a/c in and a small bit of bleed off I have

cranked

> everything up only to find it doesn't work. First time it happened

I

> almost started to dismantle the controller thinking something major

had

> gone wrong. Discovered the problem by accident, not chasing down
> electricity etc.
>
> The point is, when the air isn't working it doesn't present

problems that

> are immediately associated with air. No "flat tires", no escaping

air

> sound etc. My first thought was directed toward the electricity in

some

> form or other - bad connection, faulty thingy, burned out

whatever. You

> might want to check to see that sufficient air is reaching the
> brake. Could be as simple as low pressure.
>
> Good luck,
>
> Doug C.
> Houston, Tex.

Solenoids also tend to get sticky/dirty. If all else fails, clean
the solenoid piston.