Re: [CAD_CAM_EDM_DRO] Re: G340 enable/disable

I finally got up the nerve to pester Mariss about this again and called him
today (he is such a patient person). The enc- pin is common with the
negative input so it is perfectly acceptable to assume all enc- pins are
common on multiple amps driven from one supply. This makes it easy to solve
the problem. My solution uses two diodes per G340 and a DPDT switch.

Mariss is taking the issue one step farther and developing a sample circuit
to handle enable, disable and fault sensing. I'll post it to my website as
soon as it arrives.

Thanks for your input. The LED thing gives me something else to think
about. We should have the interface board ironed out before NAMES is over.

Doug

----- Original Message -----
From: <beer@...>
>
> I don't have the documentation in front of me, AND I STILL haven't
> wired up my G320s purchased around Christmas, so take this with a grain
> of salt.
>
> I'm assuming you want this circuit to feed an EStop input on the
> controlling PC.
>
> IIRC, there is a circuit in the documentation that shows an external LED
> being lit under a fault condition. Why not add an opto-iso in series
> with each these external LEDs ( suitably reducing the series resistor
> value ).
>
> If you use a transistor-style opto-iso, you can connect all the
> emitters of the opto-isos to the ground of the PC.
>
> Next, connect all the collectors together, and run that ( now isolated )
> junction to the EStop input of the PC.
>
> Finally, also connect the collector junction to a resistor. The other
> end of this resistor goes to +5 coming from the PC. Ta-da.
>
> If you want a further refinement, add an LED in series with this last
> resistor, to indicate a global fault.
>
> Alan