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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.
1) During torch retaining cap is detecting collision, user need notice some matter:
2) 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.
3) 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 has
guaranteed the short circuit when plasma power source anode and workpiece
has connected.
4) GND named PE must be connected well, GND size＞4mm².
5) 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.
6) Torch retaining cap collision detection circuit just need a signal line of collision
detection, circuits use wiring which arc voltage sample, so it can save a high
voltage cable.
Warning: Torch retaining cap collision detection circuit and the proximity switch detection
circuit can work at the same time, one of them can complete positioning when they has detect
collision signal. In genal, torch retaining cap IHS signal can be triggered at first and accomplish
fixed position. But when workpiece has rusted oxide or has the protective insulation, torch
retaining IHS is invalid. If torch retaining cap IHS can not complete, THC will use proximity switch
to complete positioning.
If the wiring of torch retaining cap IHS is connected true, torch retaining cap IHS will work
usefully. And user can choose whether use proximity switch on the basis of parameter. When
user set parameter P13 as 1, they should use proximity switch to detect collision. When user set
P13 as 0, they should not use proximity switch to detect collision.
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