Re: servo brake problem

Lance,

Thanks for the ideas. I think that the idea of power to turn off the
brake must be true since the brake stays on even when the machine is
off. I tried to test continuity and there is no connection from the
input to the ground side of the terminal block across any of the
solenoids including the 2 that function properly. There also a diode
somewhere accross all of the solenoids according to the schematic,
but I can't find the one across the brake solenoid. I do see the one
for the speed control solenoids. I am not sure why a diode is needed
for DC current. Everything did work before we began the retrofit 6
weeks ago. I did hook up what I thought was a proper connection to
put power from the DC powersupply to the brake solenoid and blew the
fuse in the powersupply so there might be some other problem as well.
At least I appreciate the logic that not power should mean solenoid
off and not powered. That will help me trace it through I hope.

Thanks
Keith Clark

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Lance Hopper"
<snaggletto@c...> wrote:

> Hello,
> Logically, if power were removed from the solenoid, during an E-
> stop for example, the spindle should be in brake mode. When the
> solenoid coil is charged, the spindle should be free. Just my

guess,

> mind you.
>
> Can you check and see if there is continuity through the coil? No
> electricity can flow through the coil if it's broke.
>
> If you are sure you have the right voltage etc..., maybe it's

simply

> stuck, or binding mechanically. Did it work correctly recently?
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Keith Clark" <mail@t...>
> wrote:
> > Hi guys. Can't seem to get the brake to turn off on the

Bridgeport

> > Boss 6 retrofit project. While waiting for the new motors and
> > repaired motion card, I have been trying to get control of the
> > solenoid controlled spindle brake. I don't understand why

putting

> > power directly to the solenoid does nothing. Does anyone know

how

> > the solenoid controls the brake? Does power on turn the brake on
> or
> > off? I do have the schematic wiring diagram and if anyone cares

to

> > take a stab at the answer to the question, I could email it.
> >
> > Thanks in advance,
> >
> > Keith Clark
> > clarkfamily5@c...