Re: [CAD_CAM_EDM_DRO] Connectors, switches etc.

Bob,

Are you using the proximity sensors for limit and home switches i.e. one
sensor for the home and limit for each axis?

Jay

----- Original Message -----
From: "Bob Campbell" <bob@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, May 08, 2002 10:25 AM
Subject: RE: [CAD_CAM_EDM_DRO] Connectors, switches etc.


> Jay,
>
> If you look at www.automationdirect.com they have drawings and information
> on their proximity sensors. A proximity sensor is basically an
electronics
> switch that switches whenever a metal object come in close contact with
the
> end of the sensor. The DC voltage for the sensor is in the range of 10 to
30
> volts DC. The switched output signal will then need to be converted back
to
> a 0 or 5 volt which is sent back to the PC. The break-out board that I
sell
> has an optical isolator built in to convert the signal back to 5 volts.
>
> A contactor is just a large relay that has contacts large enough to handle
> higher currents. The contactor is set up as a latching relay. By that I
mean
> that one of the contacts is used to maintain a current path for the coil
in
> the contactor once it is energized. The wiring through the on/off switch
and
> the EPO switch keeps power to the contactor. If the EPO switch is pushed
in
> or the on/off switch is turned off, the contactor will lose power and
switch
> the contacts to their open position. The contactor provides AC to my power
> supply and power to my Porter Cable router. The contactor that I use also
> has a normally closed contact that I wire to my Gecko drives disable line.
> When the contactor is energized, the disable line is open.
>
> The momentary switch is wired to energize the contactor. The sequence is
to
> turn on the on/off switch. This turns on my fans and applies 110 VAC to
one
> side of my momentary switch. By momentarily turning the momentary switch,
> 110 volts is applied to the contactor coil and energizes the contactor.
One
> contact is used to then apply 110 volts back to the coil keeping the coil
> energized (latching relay ). When you release the momentary switch, it
> reverts back to it's off position.
>
> Yes, the linear rails are attached to the extrusion with T-nuts. I have
them
> listed in my bill of materials.
>
> I hope that some of this helps. I will be adding another section to my
power
> supply PDF write-up in the next couple of weeks.
>
> Bob Campbell
>
> -----Original Message-----
> From: J.Critchfield [mailto:js3mc@...]
> Sent: Tuesday, May 07, 2002 9:25 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Connectors, switches etc.
>
>
> Bob,
>
> > For limit switches, I like Proximity switches.
>
> How do these work?
>
> > On my latest system, I used a contactor which is connected to my EPO
> switch
> > to drop all power if necessary including the power to my router. The
> > contactor also has a special normally closed contact that I use to
connect
> > to the disable contact on the Gecko drives.
>
> What is a contactor? How is it wired to the EPO? How is the router spindle
> wired to all this? Ak!
>
> I looked over your web site- very helpful. A comment about the power
supply
> page- The diagrams are too small to read and printing is no better (not so
> helpful)
>
> I looked over the bill of materials and I have one more question (yeah
> right) What is the momentary switch for?
>
> Oh ya! Looking at the pics of the machine. How did you attach the linear
> guides to the extrusion? Custom T-slot nut(s) or????
>
> Thanks,
>
> Jay
>
>
>
>
>
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