Differences

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

--- thc:thc [2020/02/19 13:04] – ivan
+++ thc:thc [2020/10/09 11:21] – ivan
@@ Line 69: / Line 69: @@
 **8.** Set the **THC Low Speed, [%] of feedrate** value. Whenever the speed of the machine will fall lower than this percentage of the feedrate, the possibility of the arc voltage fluctuating rises greatly. Thus, to prevent the torch from diving, the last height value before the speed goes below your THC Low Speed percentage value is taken and maintained until the speed rises back up again.
+The below diagram illustrates the way THC Low Speed works. On corners (green), the speed falls below the typical Feedrate #1 (red), so it can be used to disable THC on sharp corners. Feedrate #2 (blue), which is typically different from Feedrate #1, is used for hole and arc cutting. This way, THC will still be ON at smooth corners:
+{{:thc:plasma-setup-016-percentage-cutting-hole-speed.png}}
 **9.** Select the Hi/Lo event output port (63 by default).
@@ Line 145: / Line 149: @@
   * **_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.
@@ Line 166: / Line 175: @@
   * **IHC Cutting Height**. After the pierce time has elapsed, the machine moves the torch to the cutting height at which the cutting will begin.
   * **THC Start Delay** signifies the time for which Torch Height Control is not turned on after the cutting has started (to prevent metal splashes/voltage variations that are often present at the beginning of the cut to impact the cutting procedure). This delay can be set to ON or OFF in the User Settings.
-  * **THC Pre-off time**. In order to prevent sudden movements due to rapid voltage changes as a cut (especially when cutting a hole) is done, THC can be turned off some time before the end of the cut and the machine will be kept at a set height until the THC system will move to the next cut.
+  * **THC Pre-off time**. In order to prevent sudden movements due to rapid voltage changes as a cut (especially when cutting a hole) is finishing up, THC can be turned off some time before the end of the cut and the machine will be kept at a set height until the THC system will move to the next cut.
   * **Lift After Cut Height** to move the torch up to after the cut has completed.