Plasma machines use a constant current power supply for cutting steel. The power supply can range from 10 to 400 amps (or more) selected from the plasma machine control panel. A constant current supply keeps the cutting current at the user selected value by changing the cutting voltage as the load changes. The load changes as the distance from the torch tip to the metal you are cutting changes. The HP105 Torch Height Control (THC) monitors this “Tip Voltage” and adjusts the torch height (by control DC motorized Z axis) to maintain Tip Voltage to within ±1V∽±5V ( adjustable) of the user Set Voltage.
When the distance between torch and cutting plate gets farther, the arc voltage increases and when torch comes close to the plate the arc voltage will decrease. HP105 plasma arc voltage height controller will constantly measuring the voltage change and will keep a constant distance between the torch and cutting plate using motor output to the DC Motorized Z axis.
Please for more informations go to download tab and download the datasheet of this product.