CNC and Torch Height Controller Interfaces

A CNC cutting system coordinates machine motion, the cutting process and torch height. Depending on the equipment, height control may be integrated into the CNC or provided by a separate controller. The division of functions and the signals used depend on the specific configuration.

Information to check

• Motion and height control: Identify which device controls each axis and how the lifter motor is driven.
• Cutting process: Identify how the CNC, height controller and plasma power source exchange start and arc-transfer information, where applicable.
• Height sensing: Check the required sensor, voltage feedback or divider and any initial positioning method for the exact unit.
• Operation: Establish which device controls pierce timing, automatic height control and torch retraction. Check whether any height-hold or collision signals are available and how they are used.
• Electrical interfaces: Verify terminal assignments, signal direction, levels, supply requirements and isolation as specified in each device’s documentation.

Do not assume that similarly named signals have identical electrical characteristics or sequencing. Have qualified personnel follow the equipment manuals and applicable electrical safety requirements.

Review the system interface checklist