深圳市宏宇达数控技术有限公司
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2、 XPTHC-4 Function and Setting
2.1、XPTHC-4 Function
Auto work follow:
CNC arc start signal to THC---THC start IHS first----Arc start---THC find divided arc
voltage in THC-------Pierce time delay----Pierce completed---CNC receives arc ok signal
from THC or Plasma then start Motion----over 90% full speed, CNC enable THC’s auto
mode----Cycle ends and arc off, Torch lift up to programmed height.(Note：there is no dynamic
pierce function under sample mode)
Auto initial height sensing(IHS)
Touch Switch IHS and Proximity switch IHS.
Please note that it’s not suitable for the touch retaining cap IHS for this THC(XPTHC-4).
A、Touch switch IHS：（adopts to install a micro switch in the lifter, please refer to wiring
diagram）
The micro switch is usually at Normally Open status. During IHS, it is activated when torch
goes down to touch the cutting material, and THC will let the lifter go up to the setting IHS
height, the IHS finished.
B、Proximity switch
XPTHC-4 adopts NPN proximity switch IHS, Normally open or Normally closed could be
set by P9 parameter.
During IHS, when torch goes down to touch the cutting material, the proximity switch takes off
the proximity point, and send out the signal, then THC makes the torch go up to the IHS
height(which is set by P3 parameter). When the proximity switch is always at the taking off
status, the torch will go up with max speed to the Up limit position. In this way, it has the
anti-collision function to protect the torch.
Setting arc volt and actual cutting volt display function
Before plasma arc, it shows the setting arc volt; After arc start and detected the arc signal,
and pierce delay, then it shows the actual cutting volt.
When during cutting, press the “MENU” button to check the setting arc volt.
Adjust the cutting height function
During the auto work, pressing the “UP” and “DOWN” button on the operation panel to change
the setting arc volt. Setting arc voltage changes 1V within 0.3 second button press; changes
5V over 0.5 second button press. Changing the setting arc voltage means changing the
cutting height.
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