INSTALLATION & OPERATION MANUAL
3 | P a g e w w w . n t e n g i n e e r s . i n
Overview
DigiCut THC is a automatic plasma torch height control/initial height sensing system designed for
conventional plasma cutting applications on an X-Y cutting table. The system uses the raw plasma arc
voltage to control the physical stand-off (distance) between the torch and work piece during plasma arc
cutting. Initial Height Sense (IHS) is accomplished by ohmic contact sensing or by a floating switch
method. The THC has been designed and optimised for conventional air plasma systems.
DigiCut THC systems includes the following components
MAIN THC UNIT
The Main THC Unit houses a microcontroller, a HMI with a Backlit Graphic LCD Display, LED's for
Status and buttons. The Main THC unit is the heart and control centre of the entire THC operation. The
Main THC unit interfaces with the CNC Machine, Plasma Power Supply, Voltage Divider Unit, Ohmic
IHS Unit through discrete IO connectors.
VOLTAGE DIVIDER UNIT
The voltage divider unit provides a filtered and isolated low voltage signal which is derived from the
actual ARC voltage of the Plasma Arc voltage. The unit receives raw arc voltage from the plasma
power source. Special care and safety precautions should be taken and the unit must not be touched or
handled while the plasma is in operation. The unit enclosure must be properly grounded to ensure
personnel safety. The unit can be mounted near to the plasma power supply.
OHMIC IHS UNIT
The unit provides Ohmic sensing (contact sensing) capability with isolation to the Main THC Unit. The
unit has connections to AC power, Main THC Unit and the Work (Job) and the Shield (Torch). Special
care and safety precautions should be taken and the unit must not be touched or handled while the
plasma is in operation. The unit enclosure must be properly grounded to ensure personnel safety. The
unit can be mounted near to the plasma power supply.
OPTIONS (NOT INCLUDED IN STANDARD ORDER)
1. LIFTER ASSEMBLY WITH MOTOR & DRIVER
2. FLOATING SWITCH BASED TORCH HOLDER ASSEMBLY
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