
Portable Plasma Torch Height Controller Manual (F1620)
figure 3.12 voltage divide board wiring diagram
Work process:THC receives arc start signal from CNC, lifts torch down right
away until torch retaining cap collide the workpiece. When retaining cap touches
workpiece, collision detection circuit can be connected. THC can receive this collision
signal right away and lift torch up to the set height. Then THC control plasma power
source start to work.
During torch retaining cap is detecting collision, user need notice some matter:
1) Cable connect to retaining cap via “SHILED” position, at the same time, in
high voltage wires, user can twine a magnetic ring near the pressure plate, and user
can make cable twine some rounds in magnetic ring. It can avoid high-frequency
interference which plasma arc voltage produced usefully.
2) When Cutting material and workpiece connect with plasma power source
anode, they are short circuit, and ensure the circuit is low impedance. Wiring usually
can accomplish it. it do not need treat specially, because it have guaranteed the short
circuit when plasma power source anode and workpiece have connected.
3) GND named PE must be connected well, GND size>4mm².
4) When torch retaining cap contact with workpiece, tangent resistance <20kΩ.
Otherwise, torch retaining cap collision detection circuit can not work because of
impedance is too large. It is especially important for rusty steel note, if the steel rust is
serious, user should clean the steel surface before torch start work, remove rust layer.
5) Torch retaining cap collision detection circuit just need a signal line of
31