Re: [CAD_CAM_EDM_DRO] Re: servo brake problem

Yes I would say the idea is to have it fail safe which means the break would
be on if it failed ( up powered ). You may want to consider activating the
solenoid first and have it enable the motor through a contactor in order to
make sure the break is off before applying power to the motor. That way if
the breaks fails to operate ,for what ever reason, you can't start the
motor.
Jim

----- Original Message -----
From: "Keith Clark" <mail@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, August 28, 2004 8:03 AM
Subject: [CAD_CAM_EDM_DRO] Re: servo brake problem


>
> The spindle solenoid and brake were already wired and working before
> the retrofit process began since it was a Boss 6 CNC Bridgeport and
> all the switches etc are already there. Problem is that I can't
> figure out where the proper wire is that gives power to the solenoid
> for brake. I did get good advice that there is a red button on the
> end of the solenoid that when pushed did release the brake by
> activating the solenoid!!! That is a useful piece of info for
> anyone out there in the future working with these creatures to
> remember! I am so thankful to have recieved the help.
>
> If I can get the solenoid powered, I have a new relay to insert that
> would power up the solenoid as needed when the spindle is powered.
> It has AC on the control side that can be connected to the contact
> side of the spindle motor control relay. On its contact side would
> be the power to the solenoid. The contact side has two poles to
> select from - normally open and normally closed. Seems like the
> perfect solution to have brake on whenever there is no power to the
> spindle as it was originally. Sounds logical?
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, <james_cullins@s...> wrote:
> > Good pint Doug
> > It sounds like he need to provide a switch operated by the air
> solenoid that
> > will enable the motor only after the break is released. If it
> doesn't
> > already have one.
> > Jim
> > ----- Original Message -----
> > From: "Doug Chartier" <doug@c...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Saturday, August 28, 2004 2:24 AM
> > Subject: Re: [CAD_CAM_EDM_DRO] Re: servo brake problem
> >
> >
> > > At 01:31 AM 8/28/2004, you wrote:
> > > >Still got the axis motor wiring problem in another
> > > >question to tackle. I think I will eventually get to the
> bottom of
> > > >all this with a lot of help from my new CAD-CAM-EDM-DRO friends!
> > >
> > >
> > > A bit more info that I just remembered.
> > >
> > > The times the spindle motor would not turn - when the air
> pressure was low
> > > or non existent - the inverter that runs the spindle motor
> tripped
> > > out. Since the inverter and the controller including the
> solenoids are on
> > > completely different circuits, that tells me the brake is
> ENGAGED, thus
> > > causing the inverter to overload when trying to start the
> spindle motor
> > > causing it to trip.
> > >
> > > If this is true, the fact that your spindle motor will not turn
> may have
> > > nothing to do with the motor or the wiring. Getting the brake
> disengaged
> > > may solve all your problems.
> > >
> > > Another guess - is it possible the brake solenoid is wired
> backwards so it
> > > provides air pressure when the pressure is supposed to be
> released?
> > >
> > > Doug C.
> > > Houston, Tex.
> > >
> > >
> > >
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> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
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.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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