Differences

This shows you the differences between two versions of the page.

--- thc:thc [2020/03/13 10:17] – ivan
+++ thc:thc [2023/12/28 14:10] (current) – ivan
@@ Line 73: / Line 73: @@
 {{:thc:plasma-setup-016-percentage-cutting-hole-speed.png}}
+Typically, a good starting point for setting up THC Low Speed value is around 80-95%. That is, when the speed decreases by anywhere from by 5-20%, the system will turn off Torch Height Control.
+//NOTE: It is not recommended to set this value to 100%, as the THC can then be turned off even on straight sections of the work path far away from corners (due to integer operations within the controller).//
 **9.** Select the Hi/Lo event output port (63 by default).
@@ Line 116: / Line 120: @@
 **19.** Select the **THC Jog speed ratio**. This is usually set to be an order of magnitude lower than the working speed, as to not move the torch erratically.
+**20.** Enable **DC Motor Control** for DC motors only, with options for PWM channel and direction.
+**21.** Enable **AxisPlus 0/1 for Height Control** if necessary. The first option can be enabled to utilize the THC settings for AxisPlus (instead of Z-axis only). Second option is reserved for Focus axis (currently in beta testing, usually left disabled).
+**22.** Set the **THC PID dead zone**. This option will monitor the current arc voltage value. If that value differs from the reference by less than the selected value (in ADC units), then no control signal is generated. This is done to potentially reduce the response to noise in the voltage signal readings.
+    * NOTE: For high levels of noise in the arc voltage value readings, the dead zone setting is typically not sufficient to prevent excessive motion on its own. In such a case, it is recommended to either improve noise filtering for the electronics hardware, or to change the PID coefficients within the myCNC software.
 === Check that the THC is ON ===
@@ Line 149: / Line 160: @@
   * **_Table** - similar to regular Table, with a predefined value for the reference voltage, however the THC Start Delay WILL be used.
   * **_Measure** - similar to regular Measure, the reference voltage value is recorded by the controller prior to the THC Start. THC Start Delay WILL be used.
+  * **Measure 1V** - the reference voltage is measured (similar to the **Measure** setting), but if the voltage has changed a lot relative to the previous reference voltage, then the new value will change no more than the specified value (for example 1V)
+    * For example, if the previous voltage was 125, and 130 was the new measured value, then the new reference voltage will be set to 126
+    * The maximum reference voltage change is set in the THC settings (Settings > Config > Technology > THC):
+{{:thc:thc-setup-015-new-settings.png}}
+  * **_Measure 1V** - similar to regular Measure 1V, with the THC Start Delay.
 A skilled operator can also control the reference arc voltage, if necessary, to bring the torch up/down, however the system allows for a fully automatic Torch Height Control through these settings.