Andy,
Interesting info man. Actually that is kinda what I was planning to do
with the computer power but the 24volt power supply had not occurred to me
to do that way. When you say contractors I wonder if you mean the same
things as I do. Basically my machine has a huge rotary switch with a big
lever that was originally used to switcg power to the machine on and off.
Basically everything north of that was completely dead when thrown and now
I am thinking that is how I want to shutoff main power in as well but use
the heavy duty three phase relays that used to switch power to the drives
on and off by only using two of the three terminals on them. I figure to
use some combination of them to switch power to each of the three drives
and the spindle drive too. This is the kind of stuff I am not sure about
honestly. I can figure out how to wire up the drives and plug the necessary
wires into my 7i77 card and probably can muddle my way thru the home limit
connections as well but the main power architecture and the estop are kinda
confusing to me. I know when the original control was switched on nothing
was energized until you got the computer to a certain initialization point
then you would hit another button to energize the drives after which you
would align the machine which is basically homing everything including the
toolchange and then you would hit another button and the machine was ready
to run. I'd honestly like to simplify all of that but retain any safety
margin necessary for me. Kinda like my old RF45, Basically just power up
the computer and get to a ready state and then energize the drives all at
once perhaps with the estop and align and you are ready to run. Trying
also to arrive at the simplest most foolproof wiring scheme possible for
safe operation. Does that make sense? Thanks man....peace
Pete
On Tuesday, February 12, 2013, andy pugh <bodge...@gmail.com> wrote:
> On 12 February 2013 02:36, Pete Matos <petefro...@gmail.com> wrote:
>
>> I want to end up with an estop circuit that will kill power to
>> everything in the machine except the computer in case of an emergency
>
> On my machine I have taken the PC/controller/24V power from upstream
> of the main contactor.
> The e-stop loop then runs through the e-stop switches NC contacts and
> a channel of the 7i64 IO card. (which can pass enough current for the
> contactor coil)
>
> To close the main contactor the PC has to agree that it is allowed,
> and the E-stop buttons have to be out.
>
> The e-stop buttons also have an NO contact (completely separate from
> the 24V contactor circuit) which informs the PC that an e-stop is
> pressed, and operates the software e-stop too.
>
> This is important on my machine as the DC power supply needs to be
> allowed to bleed down to zero volts before being turned back on again
> (or the bleed-down relay explodes..), so I have a timer in HAL on the
> machine enable button.
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
>
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