Thc UP and Dn dont work

Can someone help me please? I am doing tests with my thcad 10. I see that there are readings of 80 volts when it cuts, but the thc velocity look lights up and the UP and Dn LEDs do not light up at any time. I read about speeds, but it doesn't work anyway.

If the Velocity Lock LED is on then it means that the cutting velocity has not reached the Cut Feed Rate that is set in the Cut Parmeters of the Run tab.

   Thanks Phill for your help. I am cutting at 1200mm / min cut feed rate and my axes speeds in the file. Ini are higher than this I am doing tests in circles and the speed lock led turns off and on constantly I attach a photo of my parameters. 

What does the Vel: display in the preview show when you are cutting?


Can you post the gcode file.

thanks i am going to probe in this moment.
The velocity in the preview is 600 of the circles and the squares is 1000.
My gcode. 
 

Like Tommy says, the small holes are set at 60% feed rate so THC is disabled by the velocity. That is normal behaviour.

Thank you very much for your help, could this problem be solved, so in the circles is thc inactive? Another question I am using Fusion 360 as a processor and in the final part of the code that I put here there is a line g0x0.y0 that returns to the origin to the axes but nowhere is the z axis and it also begins to move until it hits the limit switch and I have an error warning at the end of the cut, why is this?

This line in the code slows the speed to 60% of the cut feed rate:Then this line in thresets the speed to the cut feed rate:You need small circles to be cut at a slower speed, that is standard practice in plasma cutting. If you really want to cut them at full speed then you would need to change the postprocessor to do that.

PlasmaC move the Z axis automatically at the end of the cut. If it hits a physical limit switch then that means you don't have the soft limits set correctly. In the ini file the MAX_LIMIT should be less than the physical maximum limit switch and the MIN_LIMIT should be more than the physical minimum limit switch.
linuxcnc.org/docs/2.8/html/config/ini-ho...witch_example_layout