Portable Plasma Torch Height Controller Manual (F1620)
24
2.6 POWER
SOURCE PORT
（24V+）
The positive input dc 24V
2.7 POWER
SOURCE PORT
（24V-）
The negative input dc 24V
3.2.3Arc start port and proximity switch position port
THC connect arc start switch and proximity switch by a socket which have 5 pin.
Pins are defined as follows:
Figure 3.6 arc start relay and proximity switch port
The socket which have 5 pin description:
Pin
number
Signal Content
3.1 +24V The power source anole of proximity switch
3.2 SIGNAL The signal input terminal of proximity switch
3.3 COM The power source cathode of proximity switch
3.4，3.5 Arc start port
（ARCSTART_1
，
ARCSTART_2）
This is normally open contactor of relay. When CNC
send arc start commend, the contactor can close and
plasma power source start make arc start work.
Arc start port use normally open contacts of relay：during arc start and torch are
working, relay contactor can keep close. It can keep open in other condition. The
relay contactor capacity is 10A/250VAC, if work voltage and work current of arc start
control circuit are exceeded this rated value, please use relay to augment capacity.
Otherwise, system will not work steadily.
In side THC, A 200mA recoverable fuse is installed at the power supply of
proximity switch, to avoid damage of power when proximity switch failed.
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