Portable Plasma Torch Height Controller Manual (F1620)
When THC detect plasma arc voltage, it detect plasma by voltage divide circuit.
After arc voltage(which plasma output )/100, import it into THC mainframe. As
shown above:
ELECTRODE port（the screen printing word named ELECTRODE in PCB）
connect with plasma arc voltage cathode.
WORK port（the screen printing word named WORK in PCB）connect with
plasma arc voltage anode.
SHIELD port（the screen printing word named SHIELD in PCB）connect with
torch retaining cap collision detection wiring.
The plasma power source anode is connected with GND, cathode is connected
with torch nozzle, and the voltage of nozzle is negative voltage. During torch work,
the absolute value of the arc voltage is greater than 100V. Because voltage is higher
and interference is bigger, it is necessary to control by quarantining voltage divide.
THC voltage divide board use voltage divide circuit which ratio is 100:1, the arc
voltage range which we can measure is 0V~660V.
Warning：the plasma power arc voltage sampling cable need use HVSC,
plus-n-minus should not be connected contrary. If arc voltage plus-n-minus is
connected contrary, auto height control will not work. Plasma power source arc
voltage wiring need connect with wiring pile in plasma power source output, it do
not connect with torch and work piece, it can avoid disturbing by the high
frequency.
3.3.2 torch retaining cap detection circuit port
THC can have two way of IHS :
一、 Torch retaining cap IHS;
二、 Proximity switch IHS.
For torch retaining cap IHS, the torch retaining cap need connected to SHIELD
port by high voltage cable. The connection as follows:
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