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BosniaCNC wrote:

Tommylight:
"Bosniacnc did you mange to get it working ? Bosanac jesi uspio da testujes masinu?"

Dear friend,
ESTOP button does not respond, and it drives me crazy! All variants have tried and not to include.
Tomorrow I'll put up here correction in hal file.

Sve sam pokušao i neće da uključi. Limit Z sam stavio pod # i ne reaguje. Sutra ću ti ovde postaviti kopije.
Pozdrav

Gde nestade????
Did you download the new files ? give it a try and let me know how it goes.

Here I am (online). I installed version 2.6 and I see how it works.
I just set up the configuration of the EDM Charmilles Roboform 400,
View:
www.linuxcnc.org/index.php/english/forum...form-400-sinking-edm
Regards!

P.S. Moram tvoj fajl ponovo snimiti i pokušati pokrenuti ono dugme.

Hello!

Sorry, but We had to hold up this project.
Of course we simmulated all the needed signal.

I do not have any other idea.

Thanks,
Csaba

As Rick G said its looks like the correction direction is wrong.
If this is wrong Z will aways "runaway" from the setpoint
instead of following it when the THC is enabled

How can I modified the direction of the THC correction?

Its easy enough to fix the feedback direction (inverting the Direction pin is a simple way)
but this will also reverse the Z commanded position from Motion.

This may work:

Reverse the Z direction by inverting the direction pin (so feedback is correct)
This can be done in HAL

Reverse the Z axis scale (OUTPUT_SCALE) so Motion is correct


I would set the correction velocity very slow for testing, then verify
that if the setpoint voltage is higher than the torch voltage, the torch moves up
and vice versa

Sorry I am not a professional user. Can You detailed it how can I do that?

You could also try changing the sign of

thc.correction-vel

thc.correction-vel float rw

The amount of change in user units per period to move Z to correct

Rick G

Hello!

I tied to cut whith the changed thc.correction-vel parameter (it was 0.01 and modified -0.01).
Cutting velocity is betveen 2400-1680mm/min.

The THC settings:
Vel tolerance: 1500
volt: 79
volts tolerance: 1

The correction direction is changed, but result is the same that it was.
The head is only rised or only sinked.

I wached the arc volt in the hal config. It seems good (It was neer to the value given by the Hypertherm).

Can be that the correction velocity is too slow?

Thanks,

Csaba

When you say the result is the same do you mean that the feedback does not work?
(the the Z axis down not move down when the torch voltage is too high or up when the torch voltage is too low)

It was clearly backwards before since Z moved up when the voltage was already too high

Can you plot whats happening with Halscope on these pins when you do your trial cut?

thc.arc-ok
thc.z-pos-out
thc.volts
thc.vel-status

BTW a correction velocity of .01 (or -.01) is 10 mm/s (at 1 KHz servo thread)

Note that there is no acceleration limit other than the
Z stepgens maxaccel parameter so this must be set appropriately

As PCW stated a Halscope will give a better idea of what is going on.

After reading this again...

Test 1: volt setting is 135V, Velocity tolerance 5, Volt tolerance 1
Result: head is crashed into the plate, thc.volts is changed betwen 100-115V, thc.zpos-out is below -30 after a 100mm cutting.

Test 2: volt setting is 100V, Velocity tolerance 5, Volt tolerance 1
Result: head is rised, thc.volts is changed betwen 120-136V,

Test 3: volt setting is 124V, Velocity tolerance 5, Volt tolerance 1
Result: head is crashed into the plate, thc.volts is changed betwen 124-135V, thc.zpos-out is below -30

If test 1 started at 100V and went to 115V the voltage was going in the right direction, the head was moving in the wrong direction as PCW has stated.
But if the head was moving down the voltage of the plasma cutter should also be going down.

Test 2 looks like it is just going the wrong way.

Test 3 also looks like the voltage is again going in the wrong direction for what the head is doing.

What happens if you set the voltage tolerance to a really high number, say 50?

Rick G

Hello!

I attached two picture.

Screenshot_1 is made during the cutting.

The other is showed that if I disable THC and enable again the Zpos-in and Zpos-out will be different. Is it correct?

I tried to set the voltage tolerance 50, but the head also go down.

Thanks!
Csaba

Well in screen shot 1 the thc volts requested on the screen shows 1 volt.

Rick G

First I had made a screenshot from a trial cutting (with 1V voltage tolerance) as PCW ask.

Than I made another test with 50 voltage tolerance.

Sorry for my inaccuracy!

Looking at your screen shots you have volts tolerance connected to volts requested in your HAL file and that is not correct.

JT