CNC4PC THC-2 User manual

USER’S
MANUAL
VER. 2
THC-2 –TORCH HEIGHT CONTROL
Rev.2
APRIL 2023

USER'S MANUAL
TABLE OF CONTENTS
Contents Page #
1.0 OVERVIEW..........................................................................................................................1
2.0 FEATURES..........................................................................................................................1
3.0 DESCRIPTION ....................................................................................................................2
4.0 TERMINAL BOARD............................................................................................................3
4.1 POWER....................................................................................................................................3
4.2 DIVIDED INPUT.......................................................................................................................3
4.3 TORCH VOLTAGE ..................................................................................................................4
4.4 OUTPUT SIGNALS..................................................................................................................4
5.0 CONFIGURE MENU............................................................................................................5
6.0 DESCRIPTION SCREEN ....................................................................................................6
6.1 SET POINT (SP)......................................................................................................................6
6.2 VOLTAGE ARC (ARC).............................................................................................................6
6.3 HYSTERESIS (HYS)................................................................................................................6
6.4 DELAY TIME (DT)....................................................................................................................6
6.6 DIVIDED VOLTAGE CONFIGURATION.................................................................................7
6.6 ANALOG SMOOTING..............................................................................................................7
6.7 ANTI-DIVE................................................................................................................................7
6.7 AUTO_SETPOINT...................................................................................................................7
7.0 WIRING SAMPLE................................................................................................................9

User’s Manual Page 1
1.0 OVERVIEW
This module allows controlling the height of the plasma torch head relative to the workpiece
during plasma CNC operation, it supports either raw torch head voltage or input of 0-10VDC,
the ARC OK, UP and DOWN outputs are isolated.
2.0 FEATURES
•Optoisolated output working at 5 to 24VDC or open collector.
•Built-in Voltage Divider for connecting to the voltage on the torch or can use the 0-
10VDC from a voltage divider from the plasma.
•LCD Screen.
•10 to 30VDC Power Terminal (+24 Typical).
•Isolated Power Connection.
•Magnetic base can place anywhere on the machine steel surface.
•Din Rail Mountable.
•Voltage Divided software adjustable.
•Divided input.

User’s Manual Page 2
3.0 DESCRIPTION

User’s Manual Page 3
4.0 TERMINAL BOARD
4.1 POWER
Requires a 10 to 30VDC at 100mA Power Supply. Typically, +24vdc are used. “This board is
electrically isolated through a DC-DC converter.”
WARNING: Check the polarity and voltage of the external power source and connect
the 10VDC to 30VDC and GND. Overvoltage or reverse-polarity power applied to these terminals
can cause damage to the board, and/or the power source.
4.2 DIVIDED INPUT
NOTE:
Divided input is adjustable according to the plasma splitter.

User’s Manual Page 4
4.3 TORCH VOLTAGE
NOTE: It is preferable to use the divided voltage instead of the torch voltage. The Torch voltage
can be very high and there could be many safety implications in wiring this to the controller. The
high voltage could also be a possible source of noise. Use it as a last resource.
4.4 OUTPUT SIGNALS
Voltage applied can be from 5 to 80VDC@50mA, outputs signal optoisolated Open Collector.
NOTE:
It is recommended to capture and send to the controller the ARC OK signal coming directly from
the plasma machine itself. If wiring is difficult, then use the terminals of the THC unit.

User’s Manual Page 5
5.0 CONFIGURE MENU
•Push the knob to enter configuration mode.
•Navigate through the configuration menu by pressing the knob.
•Turn the knob to adjust the value.
•Push the knob to set the value and navigate to the next parameter or until you reach the run
mode.

User’s Manual Page 6
6.0 DESCRIPTION SCREEN
6.1 SET POINT (SP)
SP is the target voltage to be achieved.
NOTE: If auto_SetPoint is activated the knob it's disabled
6.2 VOLTAGE ARC (ARC)
Limit from 40 to 400VDC, True Voltage measured at the terminals or the voltage divider.
6.3 HYSTERESIS (HYS)
Is the tolerance or (+/-) voltage range used to generate an adjustment. The torch height is not
commanded to adjust if the true voltage is inside the specified range. It can be between 2 to
32VDC.
6.4 DELAY TIME (DT)
Torch motion starts the number of seconds you set as DT after the ARC signal is determined.
This can be a value between 0.1 to 9.9 seconds.
6.5 TEST MODE (TEST)

User’s Manual Page 7
Press the knob four times to enter test mode.
Turn the knob up or down to make the spindle move.
To exit test mode, press the knob once.
6.6DIVIDED VOLTAGE CONFIGURATION
Press the knob three times to enter the setting mode
Turn the knob to adjust the value.
Press the knob to set the split voltage
6.6 ANALOG SMOOTING
This data smoothest the voltage reading. This can be a value between 0 to 3.
6.7 ANTI-DIVE
If the plasma torch moves over empty space, the THC will see it as a voltage spike. Setting a
max voltage value will allow the THC to ignore the voltage spike and prevent the torch from
diving. This can be a value between 50 and 300V.
6.7 AUTO_SETPOINT

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Automatically establishes the SetPoint based on the cutting height that is set.
ACTVATE DISABLE
If auto_SetPoint is activated the knob it's disabled and the word Auto is displayed on the screen

User’s Manual Page 9
7.0 WIRING SAMPLE
Disclaimer:
Use caution. CNC machines can be dangerous machines. Neither DUNCAN USA, LLC
nor Arturo Duncan are liable for any accidents resulting from the improper use of these
devices. This product is not a fail-safe device and it should not be used in life support
systems or in other devices where its failure or possible erratic operation could cause
property damage, bodily injury or loss of life.