Plasma machines utilize a constant current power for cutting steel. While the current of the plasma cutters is constant (adjustable by the operator), the voltage changes as the distance between the torch tip and the metal plate changes. When the distance increases, the arc voltage increases, and when the torch approaches the plate, the arc voltage decreases. The cutting torch voltage can range from 10 to 400 volts (or more), depending on the Plasma cutter's model. The Torch Height Controller (THC) constantly measures the voltage change and maintains a constant distance between the torch and cutting plate by sending a signal to the Motorized Z-axis driver to move up or down.
Dani THC employs an internal Voltage Divider, constructed with high-quality components to convert high torch voltages into readable safe values. Precision filters protect the CPU from high-frequency interference emanating from the cutting torch. The THC calculates the reading values and converts them into a control signal for the motorized "Z" axis. Dani THC utilizes a state-of-the-art microcontroller (Atmega328) with nine adjustable parameters, controlled by two user-friendly buttons. Three LEDs correspond to the output signals ( THC7SUD -Arc ON, UP, and DOWN)(THC7SDP- Dir , Pul ), and a three-digit 7-segment LED display ensures visibility and resistance to high frequencies. Dani THC is built with the highest quality components to ensure safe, durable, and reliable long-term operation.
DaniTHC7SDP (Dir/Pulse) is a stand-alone device. It can directly control the "Z" axis driver without using Mach3 or a computer by sending control signals straight to the driver to move up or down at an adjustable speed. DaniTHC7SDP is suitable for use with Breakout boards not supporting THC (like USB or LAN serial communication).
Working Principle of Dani THC7SDP (DIR/PUL):
When the plasma torch is off and not engaged in the cutting process (during probing or positioning), the Dani THC is inactive. In this state, the Z-axis movement is controlled by the computer (Mach3). The THC does not interfere with or affect the Z-axis movement during this time.
However, when the plasma torch is on (during the cutting process), the torch voltage activates the THC (Torch Height Controller). In this state, the THC takes control of the Z-axis and maintains a constant desired distance between the plasma torch and the metal plate. The THC continuously adjusts the Z-axis movement based on the feedback from the torch voltage to ensure the proper height is maintained throughout the cutting process.
