Ohmic sensing question
01 Feb 2020 00:08 - 01 Feb 2020 00:11 #156278
by PCW
Ohmic sensing question was created by PCW
I assume that Ohmic sensing is independent of the plasma voltage sense for THC
but would like some confirmation.
The reason I ask is that I am designing new hardware for plasma control that
incorporates both THC and Ohmic sensing and would like to share the A-D
hardware for both functions (with a select bit) and would like to make sure that
that does not create any limitations.
but would like some confirmation.
The reason I ask is that I am designing new hardware for plasma control that
incorporates both THC and Ohmic sensing and would like to share the A-D
hardware for both functions (with a select bit) and would like to make sure that
that does not create any limitations.
Last edit: 01 Feb 2020 00:11 by PCW.
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01 Feb 2020 00:23 #156279
by phillc54
Replied by phillc54 on topic Ohmic sensing question
Yes, they are seperate and ohmic sensing is only enabled while probing.
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01 Feb 2020 01:10 - 01 Feb 2020 01:11 #156280
by rodw
Replied by rodw on topic Ohmic sensing question
Peter,
Ohmic sensing and arc voltage sensing are mutually exclusive.
Plasmac has an output pin that is asserted when probing (ohmic sensing) is in progress.
So your new hardware with the select bit will make it very easy to integrate with plasmac if the state of your select bit was :
Some of us will be waiting excitedly to see Mesa's take on Plasma control and in particular if you include a RS485 state machine that maps functions to pins for Hypertherm machines...... Phill will have his head around that side of things.
Ohmic sensing and arc voltage sensing are mutually exclusive.
Plasmac has an output pin that is asserted when probing (ohmic sensing) is in progress.
pin out bit ohmic_enable "on only while probing";So your new hardware with the select bit will make it very easy to integrate with plasmac if the state of your select bit was :
0 = Arc sensing
1 = Ohmic sensingSome of us will be waiting excitedly to see Mesa's take on Plasma control and in particular if you include a RS485 state machine that maps functions to pins for Hypertherm machines...... Phill will have his head around that side of things.
Last edit: 01 Feb 2020 01:11 by rodw.
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18 Feb 2020 23:52 #157782
by thefabricator03
Replied by thefabricator03 on topic Ohmic sensing question
PCW,
When do you think your new card will be ready?
When do you think your new card will be ready?
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19 Feb 2020 00:20 #157785
by snowgoer540
With regard to the RS-485 with Hypertherm, is it possible to use the 5i25 and 7i76 to communicate with the Hypertherm?
Replied by snowgoer540 on topic Ohmic sensing question
I assume that Ohmic sensing is independent of the plasma voltage sense for THC
but would like some confirmation.
The reason I ask is that I am designing new hardware for plasma control that
incorporates both THC and Ohmic sensing and would like to share the A-D
hardware for both functions (with a select bit) and would like to make sure that
that does not create any limitations.
With regard to the RS-485 with Hypertherm, is it possible to use the 5i25 and 7i76 to communicate with the Hypertherm?
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19 Feb 2020 00:25 #157786
by phillc54
Replied by phillc54 on topic Ohmic sensing question
No, at this stage it is from a comms port on the PC.
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19 Feb 2020 00:27 #157789
by snowgoer540
Replied by snowgoer540 on topic Ohmic sensing question
Bummer, I figured as much, worth asking though.
Excited for where this is headed though.
Excited for where this is headed though.
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19 Feb 2020 00:45 #157791
by PCW
Replied by PCW on topic Ohmic sensing question
Possibly midyear, it requires a new firmware module (SINC3 filter)
and may need a proto run to get right
and may need a proto run to get right
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19 Feb 2020 00:53 #157793
by rodw
Peter, TheFabricator03 is your man! I'm sure Phill has trained him well sifting through buggy software
Replied by rodw on topic Ohmic sensing question
Possibly midyear, it requires a new firmware module (SINC3 filter)
and may need a proto run to get right
Peter, TheFabricator03 is your man! I'm sure Phill has trained him well sifting through buggy software
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19 Feb 2020 03:48 #157807
by thefabricator03
Replied by thefabricator03 on topic Ohmic sensing question
Lol, I would not say buggy, the politically correct term is I was the alpha tester. The beta version sure works well though!
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