thcud9
Torch height control up/down input
Usage
loadrt thcud
Overview
Torch Height Control This THC takes either an up or a down input from a THC
If enabled and torch is on and X + Y velocity is within tolerance of set speed allow the THC to offset the Z axis as needed to maintain voltage.
If enabled and torch is off and the Z axis is moving up remove any correction at a rate not to exceed the rate of movement of the Z axis.
If enabled and torch is off and there is no correction pass the Z position and feed back untouched.
If not enabled pass the Z position and feed back untouched.
Typical Physical Connections using a Parallel Port
Parallel Pin 12 <= THC controller Plasma Up
Parallel Pin 13 <= THC controller Plasma Down
Parallel Pin 15 <= Plasma Torch Arc Ok Signal
Parallel Pin 16 => Plasma Torch Start Arc Contacts
HAL Plasma Connections
net torch-up thcud.torch-up <= parport.0.pin-12-in
net torch-down thcud.torch-down <= parport.0.pin-13-in
net torch-on spindle.0.on => parport.0.pin-16-out (start the arc)
net arc-ok thcud.arc-ok <= motion.digital-in-00 <= parport.0.pin-15-in (arc ok signal)
HAL Motion Connections
net requested-vel thcud.requested-vel <= motion.requested-vel
net current-vel thcud.current-vel <= motion.current-vel
PyVCP Connections In the XML file you need something like:
<pyvcp>
<checkbutton>
<text>"THC Enable"</text>
<halpin>"thc-enable"</halpin>
</checkbutton>
</pyvcp>
Connect the PyVCP pins in the postgui.hal file like this:
net thc-enable thcud.enable <= pyvcp.thc-enable
Functions
thcud(requires a floating-point thread)
Pins
thcud.torch-up bit in
|
Connect to an input pin |
|---|---|
thcud.torch-down bit in
|
Connect to input pin |
thcud.current-vel float in
|
Connect to motion.current-vel |
thcud.requested-vel float in
|
Connect to motion.requested-vel |
thcud.torch-on bit in
|
Connect to spindle.N.on |
thcud.arc-ok bit in
|
Arc Ok from Plasma Torch |
thcud.enable bit in
|
Enable the THC, if not enabled Z position is passed through |
thcud.z-pos-in float in
|
Z Motor Position Command in from axis.n.motor-pos-cmd |
thcud.z-pos-out float out
|
Z Motor Position Command Out |
thcud.z-fb-out float out
|
Z Position Feedback to Axis |
thcud.cur-offset float out
|
The Current Offset |
thcud.vel-status bit out
|
When the THC thinks we are at requested speed |
thcud.removing-offset bit out
|
Pin for testing |
thcud.correction-vel float in
|
The Velocity to move Z to correct |
Parameters
- thcud.velocity-tol float rw
-
The deviation percent from planned velocity
Releases
2 releases since Debian 12 (Bookworm); the text changed 1 time.