Is this QTPlasmac Expected behaviour - Cycle Start and Jog disabled.

tommylight
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29 May 2021 06:36 #210593 by tommylight

Replied by tommylight on topic Is this QTPlasmac Expected behaviour - Cycle Start and Jog disabled.

During cutting the voltage is set at 130V and on screen it fluctuates between 124 to 131 during cutting at 3.5m/m .
That might be a good trigger point for the plots...

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phillc54
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29 May 2021 06:40 #210594 by phillc54

Replied by phillc54 on topic Is this QTPlasmac Expected behaviour - Cycle Start and Jog disabled.

tommylight wrote:
During cutting the voltage is set at 130V and on screen it fluctuates between 124 to 131 during cutting at 3.5m/m .
That might be a good trigger point for the plots...

OK, I'll make some changes to the comp and push it to master branch tomorrow. The changes won't affect normal operation so it will be safe for everyone to use.

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phillc54
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29 May 2021 07:33 #210596 by phillc54

Replied by phillc54 on topic Is this QTPlasmac Expected behaviour - Cycle Start and Jog disabled.

Tom, I managed to cobble something together and have pushed it.

There are three additional pins:

plasmac.low_cut_volts

this is an input, you can set this so that if the arc voltage is lower than this while THC is active then the machine will pause and give an error message similar to this:

Warning: Spoiler!

The next two you may not need:

plasmac.target_volts

This is an output that shows the target arc voltage for THC.

plasmac.target_samples

This is an input that defaults to 6. You can change the number of samples needed to set the target voltage for THC.

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tommylight
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29 May 2021 07:37 #210597 by tommylight

Replied by tommylight on topic Is this QTPlasmac Expected behaviour - Cycle Start and Jog disabled.

Thanks, will give it a try after routing the network line to the new shop, all metal cladding so wifi does not work from the other shop.

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phillc54
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29 May 2021 07:38 #210598 by phillc54

Replied by phillc54 on topic Is this QTPlasmac Expected behaviour - Cycle Start and Jog disabled.

tommylight wrote:
Thanks, will give it a try after routing the network line to the new shop, all metal cladding so wifi does not work from the other shop.

There is always something...

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rodw
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29 May 2021 07:44 #210599 by rodw

Replied by rodw on topic Is this QTPlasmac Expected behaviour - Cycle Start and Jog disabled.

Tommy, I seem to remember you always set your voltage manually. Have you ever tried auto sampling voltage? What if your set point of 130 volts is wrong so Plasmac starts off on the wrong foot?

Try using halscope with the THC disabled to see what the voltage settles to naturally to set your desired voltage.

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phillc54
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29 May 2021 08:11 #210603 by phillc54

Replied by phillc54 on topic Is this QTPlasmac Expected behaviour - Cycle Start and Jog disabled.

rodw wrote:
Tommy, I seem to remember you always set your voltage manually. Have you ever tried auto sampling voltage? What if your set point of 130 volts is wrong so Plasmac starts off on the wrong foot?

Try using halscope with the THC disabled to see what the voltage settles to naturally to set your desired voltage.

If the target was 130 and the arc voltage was heading down to around 80 then it should have raised the z axis, not lowered it.

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rodw
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29 May 2021 08:40 #210604 by rodw

Replied by rodw on topic Is this QTPlasmac Expected behaviour - Cycle Start and Jog disabled.

phillc54 wrote:
If the target was 130 and the arc voltage was heading down to around 80 then it should have raised the z axis, not lowered it.

Its almost as if the height adjustments are being sent the wrong direction.

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phillc54
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29 May 2021 08:41 #210605 by phillc54

Replied by phillc54 on topic Is this QTPlasmac Expected behaviour - Cycle Start and Jog disabled.

It sure is weird ...

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tommylight
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29 May 2021 09:04 #210608 by tommylight

Replied by tommylight on topic Is this QTPlasmac Expected behaviour - Cycle Start and Jog disabled.

rodw wrote:
Tommy, I seem to remember you always set your voltage manually. Have you ever tried auto sampling voltage?

Yes, several times on all machines, it just settles to low, usually 96 to 102V so the torch remains at under 1mm from the material. All 3 machines have a working voltage of 115 to 132V.
I am pretty sure i can manage that with some tuning to go above, but usually when i am near the machines i am cutting something, so no time to play with settings. Either way i have to play with cut feeds and current and other stuff as i change plasma sources often.
Also pretty sure this issue happened also while using auto volts, but do not quote me on that.

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Is this QTPlasmac Expected behaviour - Cycle Start and Jog disabled.

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