(updated 2011-01-13) Available for testing.

myCNC-THC-RU01

Torch height controller for plasma cutting applications - myCNC-THC-RU01. The board is based on 32 bit
100MHz ARM Cortex M3 CPU.
THC controller works with myCNC-UP3, myCNC-ET1 or myCNC-ET2 CNC controllers and myCNC software.

Main features:

• Advanced algorithm for torch height control:
  • Automatic controls torch-to-work distance during plasma cutting proccess;
  • Automatic detection cutting-over-edge to prevent the torch fall;
  • Automatic sets the piercing height (if used with initial height sensing IHS);
  • Automatic low cutting speed detection and temporarily turn-off tracing to prevent falling torch;
  • Separate setting for PI-controller while motion up and down for height control system fine tuning;
• Two-channel Arc Voltage measure (Power Source voltage and Arc Voltage) for improved trace algorithm;
• Connection to Host myCNC-UP3/ET1/ET2 controller via RS485 interface and Modbus-like protocol;
• Input/output for Initial Height Sensors (IHS);
• Additional Open Collector keys/PWM outputs and opto-isolated inputs with control interface
  from HOST PC software;
• Complete integration into myCNC control software. All THC configuration parameters and information data
  are available from softwrare dialogs:
  
  • Arc voltage reference value;
  • Arc volatge measured value in real-time mode;
  • THC motion speed;
  • THC low speed indicator;
  • THC turn-on delay (THC control will be turned-on after given delay after ignition);
  • THC enable/disable switcher;
  • Motion speed value for "Low Speed mode" (percentage of cutting speed);
  • PI control configuration parameters;

A picture below shows working "THC Low Speed mode".

THC control board drives:

• DC brush motors (up to 48V @ 5A DC) through integrated CMOS H-Bridge DC brushedmotor driver
  or
• Stepper motor driver with integrated STEP/DIR outputs
  or
• Sends back to CNC controller commands to control torch-to-work distance trough third axis (Z-axis);

At the moment we are testing new revision of myTHC-RU01 board. New THC boad has compact design and contains

more powerful processor on-board. On a picture there are both revisions of myTHC boards.