How Limit Switch Power is Controlled
The machine's limit switches are wired normally closed. When an axis reaches a limit switch, the limit switch circuit opens and signals to PathPilot® that the axis has reached the end of travel. From the PathPilot® interface, on the Status tab, the Limit light of the activated axis is on when the limit switch is open. In normal operation, the Limit light is on briefly.
If the limit switch fails to operate, PathPilot® displays one of the following error messages:
- Cannot Reference ...: Indicates that the limit switch circuit is open when referencing begins. The machine doesn't attempt to reference the axis.
-
Cannot Unhome ...: Indicates that the limit switch circuit didn't operate as expected when the axis reaches the end of travel. The axis motor stops moving when the Emergency Stop button is pushed in.