Re: [CAD_CAM_EDM_DRO] CNC interface PCB

Carlos Guillermo wrote:

> Hi All -
>
> I'm working on a custom interface board for my controller, and I
> have some questions regarding power capacity of PCB traces. I
> would like to use an isolated corner of the PCB for some relays
> for energizing external devices (coolant pump, air cylinders,
> etc.) as well as possibly cutting power to the Gecko's under
> estop. The worst case is the Gecko's, rated for 80VDC and 20A.
> Obviously the Gecko's are supposed to handle this on a PCB, and
> I'm wondering what it would take in terms of trace geometry to
> handle the same ratings going from screw terminals to relays and
> back on my PCB. Has anyone fried the traces on their Gecko's?
>
> Another issues is actually finding relays that can handle 80VDC
> and 20A (no, I don't plan on actually using this much power out of
> the Gecko's...). What components are others using for estop
> relays? Are you cutting power to each drive individually, or just
> cutting off the power supply?

Brigar Electronics has DC solid state relays that look like they'd be
ideal for this purpose. See http://brigarelectronics.com/

Jon