Re: CNC interface PCB

Carlos,
When I'm not playing with cnc stuff I support the habit with my spa
repair company.(Hence the A-spa-guy handle) While this may seem to be
a bit off topic, it may come into play here. newer hot tubs routinely
use pc boards and pc board mounted relays to handle 220 volt AC 5.5kw
heat elements.(they generally amp out at about 23-24 depending on
actual supply voltage). I did a little checking and the relays can be
purchased through spa parts plus (800-521-7587) I can get them from
some other distributors too but these guys have a great tech support
that could help you with coil voltages etc. as this info is kinda
sketchy in their catalog. Also, I believe SPP will talk to the
general public, where many others won't if your not in the business.
Normally I like that, but in your case SPP may be the ticket.
Happy Hunting
Dale


--- In CAD_CAM_EDM_DRO@y..., "Carlos Guillermo"
<carlos@v...> 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?
>
> TIA,
>
> Carlos Guillermo
> VERVE Engineering & Design
>
> PS-
> Do the Gecko's use a 4-layer board??? How much difference would
> this make in terms of current capability of the traces?