Torch will not Fire

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16 May 2021 01:45 #209020 by phillc54
Replied by phillc54 on topic Torch will not Fire
What are your settings for Start Fail Timer, Max Starts, and Retry Delay in the parameters tab?

Do you get any error messages when it fails?

Do you have a Torch Pulse button as a user button?, if so does that work?

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16 May 2021 01:47 #209021 by phillc54
Replied by phillc54 on topic Torch will not Fire

Only thing i see maybe odd is my voltage offset, it seems high to me but maybe not. It's 100000 not sure that would affect the firing of the torch or not anyways.


If you are using Mode 0 then it could affect it depending on the Ok High Volts setting.

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16 May 2021 02:27 - 16 May 2021 02:28 #209026 by rodw
Replied by rodw on topic Torch will not Fire
Can you share your custom hal?
Do you use an arc-ok signal in the machine?
What is the value for setp db_arc-ok.delay?
needs to be 10 or greater
Last edit: 16 May 2021 02:28 by rodw.

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16 May 2021 03:51 #209029 by Hippy
Replied by Hippy on topic Torch will not Fire

What are your settings for Start Fail Timer, Max Starts, and Retry Delay in the parameters tab?

Do you get any error messages when it fails?

Do you have a Torch Pulse button as a user button?, if so does that work?


Start Fail Timer - 15
Max Starts - 3
Retry - 60
No errors and yes i have a pulse button and all it does is air.

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16 May 2021 03:54 #209030 by Hippy
Replied by Hippy on topic Torch will not Fire

Can you share your custom hal?
Do you use an arc-ok signal in the machine?
What is the value for setp db_arc-ok.delay?
needs to be 10 or greater


I do use an arc-ok
my arc-ok delay is 5

I will change it and see and attached is my custom hal
Attachments:

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16 May 2021 04:01 #209032 by Hippy
Replied by Hippy on topic Torch will not Fire
The change of the arc delay didn't do anything.
I have swapped tips from shielded to non.
All it does is shoot air.
I know it has to be something simple but i am at a loss.

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16 May 2021 06:29 - 16 May 2021 06:29 #209042 by rodw
Replied by rodw on topic Torch will not Fire


I do use an arc-ok
my arc-ok delay is 5

I will change it and see and attached is my custom hal


I think the torch is trying to be turned on and is then turned off by Plasmac for some reason.

Some people have had trouble with the ArcOK turning off from bouncing contacts which kills the arc before it starts.
The Hypertherm internal relay has a 10 ms on time. Changing the debounce to be >= 10 fixed their problem.
Try changing it to 15 so it is > the turn on time.

The other issue that has occurred to me is the Mesa card is a low impedance circuit and does not draw enough current through the relay contacts. For a 24 volt circuit, you need to add a 100 ohm 10 W resistor

PCW Says "Another way of providing wetting current without any added power dissipation
is to parallel the contacts with a small film capacitor circuit (say 1 uF
capacitor for a 24V circuit) This provides a high surge current on contact
closure but the total energy is limited (~.03 mJ)" See
forum.linuxcnc.org/plasmac/40819-arc-ok-...fire?start=50#191678

From here I would disable ArcOK in the QTPLasmac control panel and see if you can cut. This should confirm if my diagnosis is correct. Then obtain the components to modify your circuit.
Last edit: 16 May 2021 06:29 by rodw.

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16 May 2021 06:41 #209044 by phillc54
Replied by phillc54 on topic Torch will not Fire

I think the torch is trying to be turned on and is then turned off by Plasmac for some reason.


If that were the case then it should give a lost arc error. Apparently there are no error messages.

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16 May 2021 06:53 #209045 by rodw
Replied by rodw on topic Torch will not Fire

I think the torch is trying to be turned on and is then turned off by Plasmac for some reason.


If that were the case then it should give a lost arc error. Apparently there are no error messages.


Strange, if air starts to flow the torch had to be triggered.
If disabling arc OK does not work, I think its time to look at arc ok, torch on and torch voltage in halscope when the torch attempts to start.

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16 May 2021 06:59 #209047 by rodw
Replied by rodw on topic Torch will not Fire
When I look back, I don't think using the hand torch confirms the machine torch is OK but it does confirm the inverter is OK. PLease review Tommy's post too.

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