Voltage Scale and Auto Volts
20 Dec 2021 23:46 - 20 Dec 2021 23:50 #229582
by phillc54
Replied by phillc54 on topic Voltage Scale and Auto Volts
Hmm, there certainly is some weird behaviour there.
Can you make a backup of your config from the parameters tab and post it.
EDIT: I re-read your post and you say that the voltage is falling as the torch is rising, I would have expected the opposite.
Can you make a backup of your config from the parameters tab and post it.
EDIT: I re-read your post and you say that the voltage is falling as the torch is rising, I would have expected the opposite.
Last edit: 20 Dec 2021 23:50 by phillc54.
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20 Dec 2021 23:55 #229583
by CFE
Replied by CFE on topic Voltage Scale and Auto Volts
Hi Phil,
I have attached a backup of the config.
Well, exactly, we would expect to see the THC lowering the torch as the voltage drops, but instead it keeps moving up. I watched it again and I can see the Z-axis moving up, voltage drops a couple of volts but the THC is not correcting. That is what baffles us.
Cheers, Peter
I have attached a backup of the config.
Well, exactly, we would expect to see the THC lowering the torch as the voltage drops, but instead it keeps moving up. I watched it again and I can see the Z-axis moving up, voltage drops a couple of volts but the THC is not correcting. That is what baffles us.
Cheers, Peter
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- tommylight
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21 Dec 2021 00:00 #229585
by tommylight
The voltage is falling so the torch is raising to compensate.
Replied by tommylight on topic Voltage Scale and Auto Volts
That is not the symptom, it is the cause.
EDIT: I re-read your post and you say that the voltage is falling as the torch is rising, I would have expected the opposite.
The voltage is falling so the torch is raising to compensate.
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21 Dec 2021 00:00 #229586
by phillc54
Replied by phillc54 on topic Voltage Scale and Auto Volts
Normally if the voltage drops then the torch is raised, which is what you are describing is happening. As the torch is raised the voltage should increase but because the voltage is falling THC is trying to raise the torch.
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21 Dec 2021 00:09 #229587
by CFE
Replied by CFE on topic Voltage Scale and Auto Volts
Rigtho, so I can clearly see the torch rising and at the same time the voltage falling instead of increasing. This got me stumped.
Can it be that I have to switch the Z-axis scale ?
Can it be that I have to switch the Z-axis scale ?
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21 Dec 2021 00:10 #229588
by tommylight
Replied by tommylight on topic Voltage Scale and Auto Volts
Do you access to a DVM with memory?
Also can you do a hal scope of the encoder velocity and set it to trigger when the velocity drops?
This has all the makings of a bad contact on the plasma cutter or THCAD.
Also can you do a hal scope of the encoder velocity and set it to trigger when the velocity drops?
This has all the makings of a bad contact on the plasma cutter or THCAD.
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21 Dec 2021 00:18 #229590
by CFE
Replied by CFE on topic Voltage Scale and Auto Volts
Hi Tommy,
I will have a go with HAL Scope. The plasma cutter is only a couple of months old, I like to think that should be alright. And don't forget, this thing cuts no worries on 12 and 16mm plate, with the THC working (and working fast too, pretty amazing to see). But as soon I get to 25mm the thing plays up.
Another thing I just noticed : I am cutting test pieces, rectangular 250x25mm with 5mm corner radii. Sometimes when it comes out of a corner the torch lifts up, and then sometimes it doesn't. Can velocity anti dive or void anti-dive interfere in any way ? I am just clutching straws here.
Cheers, Peter
I will have a go with HAL Scope. The plasma cutter is only a couple of months old, I like to think that should be alright. And don't forget, this thing cuts no worries on 12 and 16mm plate, with the THC working (and working fast too, pretty amazing to see). But as soon I get to 25mm the thing plays up.
Another thing I just noticed : I am cutting test pieces, rectangular 250x25mm with 5mm corner radii. Sometimes when it comes out of a corner the torch lifts up, and then sometimes it doesn't. Can velocity anti dive or void anti-dive interfere in any way ? I am just clutching straws here.
Cheers, Peter
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21 Dec 2021 01:32 #229592
by CFE
Replied by CFE on topic Voltage Scale and Auto Volts
Hi all,
Just out of curiosity I have set the encoder scale to -1 : setp encoder.0.position-scale -1 to see what happens. Reasoning that the voltage should increase instead of decrease when the torch lifts up. I am no expert on HAL, but I assumed that's how I could reverse the voltage scale. It didn't make any difference though. I can clearly see the torch lifting up substantially before there is a drop in the voltage, and it gets worse from there.
Just out of curiosity I have set the encoder scale to -1 : setp encoder.0.position-scale -1 to see what happens. Reasoning that the voltage should increase instead of decrease when the torch lifts up. I am no expert on HAL, but I assumed that's how I could reverse the voltage scale. It didn't make any difference though. I can clearly see the torch lifting up substantially before there is a drop in the voltage, and it gets worse from there.
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21 Dec 2021 03:34 #229599
by CFE
Replied by CFE on topic Voltage Scale and Auto Volts
Hi all,
I will let it rest till after New Year. Just cut 1.6mm at 45A, 6000mm/min and the THC works fabulously. I got a spare THCAD-10 here which I will use when I get to it, there is something in the voltage reading on the thick material that is bugging me.
Thanks for all your help and suggestions again, I know this is all a work of love and understand the time and effort that goes into a piece of software like this. Much appreciated !
Cheers, Peter
I will let it rest till after New Year. Just cut 1.6mm at 45A, 6000mm/min and the THC works fabulously. I got a spare THCAD-10 here which I will use when I get to it, there is something in the voltage reading on the thick material that is bugging me.
Thanks for all your help and suggestions again, I know this is all a work of love and understand the time and effort that goes into a piece of software like this. Much appreciated !
Cheers, Peter
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21 Dec 2021 03:35 #229600
by phillc54
Replied by phillc54 on topic Voltage Scale and Auto Volts
The plasmac component uses the absolute value so changing the sign will have no effect.
There is a hal pin name plasmac.target-volts that may be worth watching, that shows the voltage that THC is trying to maintain.
There is a hal pin name plasmac.target-volts that may be worth watching, that shows the voltage that THC is trying to maintain.
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