QtDragon Documentation

- HOLE CIRCLE UTILITY
- FACING UTILITY
- NGCGUI
- USING A VFD
- SPINDLE PAUSE
- Z LEVEL COMPENSATION
- USING A MPG
- PROBING
- RUN FROM LINE
- STYLESHEETS
- ABOUT

# USING A VFD

QtWoodPecker was designed to interface to a VFD, but will work without one for simulation purposes. There are a number of VFD drivers included in the linuxcnc distribution, including hy_gt_vfd and mb2hal. A custom HAL component has been created for use with QtDragon, called hy_gt_vfd.py (same name as the linuxcnc version)

The following HAL connections must be added to the qtdragon_postgui.hal file:

    loadusr -Wn gt_vfd ./hy_gt_vfd.py -d /dev/ttyUSB0

    net spindle-on       gt_vfd.spindle-on <= spindle.0.on

    net spindle-fb       gt_vfd.speed-fb => spindle.0.speed-in

    net spindle-cmd      gt_vfd.speed-cmd <= spindle.0.speed-out-abs

    net spindle-amps     gt_vfd.output-amps => woodpecker.spindle_amps

    net spindle-volts    gt_vfd.output-volts => woodpecker.spindle_volts

    net spindle-fault    gt_vfd.fault-info => woodpecker.spindle_fault

    net modbus-errors    gt_vfd.modbus-errors => woodpecker.modbus-errors

    net spindle-fwd      spindle.0.forward => and2.0.in1

    net at-speed-fwd     spindle.0.at-speed <= and2.0.out

    net at-speed-fwd     woodpecker.hal_led_atspeed

NOTE: The hy_gt_vfd.py module requires the python pymodbus library.

sudo apt install python3-pymodbus