Under development. Based on LinuxCNC specification, with limitations.
| Mode | Description |
|---|---|
| 0 | Uses an external arc voltage input to calculate both Arc Voltage (for Torch Height Control) and Arc OK. |
| 1 | Uses an external arc voltage input to calculate Arc Voltage (for Torch Height Control). Uses an external Arc OK input for Arc OK. |
| 2 | Uses an external Arc OK input for Arc OK. Use external up/down signals for Torch Height Control. |
| Setting | Modes | Description |
|---|---|---|
| $351 - Delay | 0,1,2 | This sets the delay (in seconds) measured from the time the Arc OK signal is received until Torch Height Controller (THC) activates. |
| $352 - Threshold (V) | 0,1,2 | This sets the voltage variation allowed from the target voltage before for THC makes movements to correct the torch height. |
| $353 - P Gain | - | This sets the Proportional gain for the THC PID loop. This roughly equates to how quickly the THC attempts to correct changes in height. |
| $354 - I Gain | - | This sets the Integral gain for the THC PID loop. Integral gain is associated with the sum of errors in the system over time and is not always needed. |
| $355 - D Gain | - | This sets the Derivative gain for the THC PID loop. Derivative gain works to dampen the system and reduce over correction oscillations and is not always needed. |
| $356 - VAD Threshold (%) | - | (Velocity Anti Dive) This sets the percentage of the current cut feed rate the machine can slow to before locking the THC to prevent torch dive. |
| $357 - Void Override (%) | - | This sets the size of the change in cut voltage necessary to lock the THC to prevent torch dive (higher values need greater voltage change to lock THC) |
| Setting | Modes | Description |
|---|---|---|
| $358 - Fail Timeout | 0,1,2 | This sets the amount of time (in seconds) PlasmaC will wait between commanding a "Torch On" and receiving an Arc OK signal before timing out and displaying an error message. |
| $359 - Retry Delay | 0,1,2 | This sets the time (in seconds) between an arc failure and another arc start attempt. |
| $360 - Max Retries | 0,1,2 | This sets the number of times PlasmaC will attempt to start the arc. |
| $361 - Voltage Scale | - | This sets the arc voltage input scale and is used to display the correct arc voltage. |
| $362 - Voltage Offset | - | This sets the arc voltage offset and is used to display zero volts when there is zero arc voltage input. |
| $363 - Height Per Volt | - | This sets the distance the torch would need to move to change the arc voltage by one volt. Used for manual height manipulation only. |
| $364 - Ok High Voltage | - | This sets the voltage threshold below which Arc OK signal is valid. |
| $365 - Ok Low Voltage | - | This sets the voltage threshold above which the Arc OK signal is valid. |
M62 P2 will disable THC (Synchronized with Motion)
M63 P2 will enable THC (Synchronized with Motion)
M64 P2 will disable THC (Immediately)
M65 P2 will enable THC (Immediately)
M67 E3 Q- Velocity Reduction (Immediately)
M68 E3 Q- Velocity Reduction (Synchronized with Motion)
The Q-word for M67 and M68 is the percentage of the programmed feed rate the actual feed rate will be changed to.
The minimum percentage allowed is 10%, values below this will be set to 10%.
The maximum percentage allowed is 100%, values above this will be set to 100%.
Driver must support a number of ioports ports.
LinuxCNC documentation linked to above.
2021-08-10