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PlasmaC torch starting problem (Solved with help from the famous three)

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6 years 7 months ago #160911 by rodw
Replied by rodw on topic PlasmaC torch starting problem

Clive S wrote:

rodw wrote:

Clive S wrote: I have noticed that when the button is pressed it stops the air purge briefly


I'm not sure that firing a torch in the air without cutting something proves anything. Its the arc transfer is the issue.

Does this interruption of the air flow happen when the CNC triggers it with a relay? If not, what is different about your switch and the relay?

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OK the switch is wired across the relay contacts so it is doing what the relay should do.
Its hard to see with the relay as it drops out to quick.
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When it probes for the fail cut (ie the second one) I can press the button and hold it for about 1sec then release and the cut will continue.

Sounds like the air is halted to allow the pilot arc to fire when you press the button.

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Yes it does But if we could get the relay to stop on longer it should work

So I went back and read the first few posts. Seems like we have been around the world.

So the original problem was the relay was turning off prematurely.
So we've since confirmed that Plasmac is working correctly.
It wasn't initially clear that a lot of testing was just on piercing, It needs to be based on a complete cut as Tommy says.
We are fairly certain that the issue is that the arc is not transferring to the material because the voltage is up around 230 volts.

But the relay is still turning of prematurely.

So does that state the situation?

So are you using a gcode file to do your testing? Write one by hand that does a single cut about 75 mm long

Seems to me with the software confirmed working and if a switch works and a relay doesn't, the issue must be related to HF noise. I'm not sure there is a solution other than waiting 15secs between cuts

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6 years 7 months ago - 6 years 7 months ago #160949 by phillc54
Replied by phillc54 on topic PlasmaC torch starting problem
From the plots on this post the torch is being turned off because PlasmaC sees a voltage within its set window and then that voltage drops out of the window. It appears the voltage is from the pilot arc and not the cutting arc.
I think your best solution would be a current sensor either similar to this post or at the bottom of this post and this would avoid the pilot arc being used by PlasmaC as the arc ok source.
Last edit: 6 years 7 months ago by phillc54.
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6 years 7 months ago #160950 by Clive S
Replied by Clive S on topic PlasmaC torch starting problem

phillc54 wrote: From the plots on this post the torch is being turned off because PlasmaC sees a voltage within its set window and then that voltage drops out of the window. It appears the voltage is from the pilot arc and not the cutting arc.
I think your best solution would be a current sensor either similar to this post or at the bottom of this post and this would avoid the pilot arc being used by PlasmaC as the arc ok source.


I take it you saw the vid of the torch firing with the button. and the manual cuts of 150mm with using the button and jogging worked fine even with the air running.

Yes I have found a reed switch from an alarm contact. I will try and make 3 tight turns on the earth clamp cable to see if it will close the switch. if it does I could wire it through a relay coil and use the contacts to fire the torch.

Would I have to change any mode in PlasmaC etc

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6 years 7 months ago #160951 by phillc54
Replied by phillc54 on topic PlasmaC torch starting problem
No, the idea here is to use the current sensor as an Arc OK signal.

You would need to change PlasmaC to mode 1 in the in file and you would need to enable the following in your connections.hal file.
Code:
#net plasmac:arc-ok-in ***YOUR_PLASMA_ARC_OK*** => plasmac.arc-ok-in
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6 years 7 months ago #160957 by Clive S
Replied by Clive S on topic PlasmaC torch starting problem

phillc54 wrote: No, the idea here is to use the current sensor as an Arc OK signal.

You would need to change PlasmaC to mode 1 in the in file and you would need to enable the following in your connections.hal file.

Code:
#net plasmac:arc-ok-in ***YOUR_PLASMA_ARC_OK*** => plasmac.arc-ok-in


Is this the correct file: plasma_machine_connections.hal I don't see any arc-ok-in
Code:
# Keep your plasmac i/o connections here to prevent them from # being overwritten by updates or pncconf/stepconf changes # Other customisations may be placed here as well # This file is built by the configurator in your configuration directory #***** debounce for the float switch ***** # the lower the delay here the better # each 1 is a 0.001mm (0.00004") increase in probed height result loadrt debounce cfg=3 setp debounce.0.delay 5 addf debounce.0 servo-thread #***** arc voltage lowpass cutoff frequency ***** #***** change to the cutoff frequency you require ***** setp plasmac.lowpass-frequency 0 #***** the joint associated with the Z axis ***** net plasmac:axis-position joint.1.pos-fb => plasmac.axis-z-position net plasmac:arc-voltage-in hm2_7i96.0.encoder.00.velocity => plasmac.arc-voltage-in net plasmac:float-switch hm2_7i96.0.gpio.003.in => debounce.0.0.in net plasmac:breakaway hm2_7i96.0.gpio.004.in_not => debounce.0.1.in # net plasmac:ohmic-probe {YOUR OHMIC PROBE PIN} => debounce.0.2.in # net plasmac:ohmic-enable plasmac.ohmic-enable => {YOUR OHMIC ENABLE PIN} net plasmac:torch-on => hm2_7i96.0.ssr.00.out-00 # a 1 here allows multiple tools to be used # gcode M3 S1 needs to be changed to: # M3 $0 S1 for the plasma torch # M3 $1 S1 for the scribe setp plasmac.multi-tool 0 # net plasmac:scribe-arm plasmac.scribe-arm => ***YOUR_SCRIBE_ARMING_OUTPUT*** # net plasmac:scribe-on plasmac.scribe-on => ***YOUR_AIR_SCRIBE_ON_OUTPUT***

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6 years 7 months ago #160959 by phillc54
Replied by phillc54 on topic PlasmaC torch starting problem
Yes, that is the correct file.

It wouldn't be in your original file because you had mode 0. You can just add the line in and put in your 7i96 pin that you connect the signal to.

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