Ohmic sensing relays

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17 Sep 2019 19:55 #145428 by motal2004
Hello Peeps,

Need some advice
I'm looking in to the Ohmic Sensing schematic, linuxcnc.org/docs/devel/html/plasma/plas...r.html#ohmic-sensing , and I was wondering if anyone has any recommendations for the relays that I should used, I'm in the States.

Thanks.

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17 Sep 2019 20:03 #145429 by rodw
Replied by rodw on topic Ohmic sensing relays
I use Relays from RS Components Part number 888-6843
A few people are using opto22 modules

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17 Sep 2019 20:54 #145439 by motal2004
Replied by motal2004 on topic Ohmic sensing relays
thank you

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20 Sep 2019 19:31 #145703 by motal2004
Replied by motal2004 on topic Ohmic sensing relays
Hi Rod,
follow up question
the field power (24VCD)
digital input

0V
Digital output (24VCD)
where do these go? just need some clarification.

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20 Sep 2019 19:37 #145704 by bevins
Replied by bevins on topic Ohmic sensing relays

motal2004 wrote: Hi Rod,
follow up question
the field power (24VCD)
digital input

0V
Digital output (24VCD)
where do these go? just need some clarification.


(digital input) That is a input to the controller.
(filed power mesa) =====> switch =======> input (mesa)

(digital output) That is an output from the controller.
output (mesa) =====> + side of relay coil, - side relay coil ======> com (mesa field power)

I think Rod uses mesa. Thats how the mesa I/O works.

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20 Sep 2019 19:45 #145707 by motal2004
Replied by motal2004 on topic Ohmic sensing relays
Thank you bevins,
I'm using a mesa 7i96 board.

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20 Sep 2019 20:02 #145710 by PCW
Replied by PCW on topic Ohmic sensing relays
The same connections should work with a 7I96 using the 7I96s isolated inputs
as long as the isolated input common is ground

7I96 outputs are basically just switches so for example
+24V ==> 7I96 OUT+
7I96 OUT- ==> RELAY+
RELAY- ==>GND

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20 Sep 2019 23:30 #145723 by bevins
Replied by bevins on topic Ohmic sensing relays

motal2004 wrote: Hi Rod,
follow up question
the field power (24VCD)
digital input

0V
Digital output (24VCD)
where do these go? just need some clarification.


When you run the Plasmac configurator, you tell it which inputs and outputs that coincide with your setup.

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