Michael80 wrote: ook, so i need more space in my panel 
Is this a plastic box? If yes there is no chance this will ever work. Plasma cutting is the worst case for EMI. You have to use a shielded metal cabinet and proper star grounding, that means:
* the cabinet has to be connected to the machine base at only one point.
* Any cable shields have to be connected to the cabinet directly where they enter
* The power supply and the triple beast must be grounded (mounted on the base plate inside the cabinet with metal screws or on a DIN rail)
* Keep motor and sensor cables as far away from the torch cable as possible. Do not route them directly next to each other.
* connect the return cable of the plasma current source directly to the workpiece support grid so that no cutting current flows through the machine base and ground connections
* also ground all moving parts of the machine (bearings don't count as ground connection)
* isolate the current source completely from the electronics box. Use optocouplers or relays for all signals, especially plasma-on and arc-good.