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XR3 Hardware Manual
2.4.5. End of Travel and Home Limit Inputs
End of Travel (EOT) limits are required to define the end of the physical travel on linear axes. Positive or
clockwise motion is stopped by the clockwise (CW) end of travel limit input. Negative or counterclockwise
motion is stopped by the counterclockwise (CCW) end of travel limit input. The Home Limit switch can be
parameter configured for use during the home cycle, however, the CW or CCW EOT limit is typically used
instead. All of the end-of-travel limit inputs accept 0-5 VDC level signals. Limit directions are relative to the
encoder polarity in the diagnostics display (refer to
Table 2-15:
End of Travel and Home Limit Pins on the Feedback Connector
Pin #
Description
12
Clockwise End of Travel Limit
16
+5V Power
20
Signal Common
21
Signal Common
22
Home Switch Input
24
Counterclockwise End of Travel Limit
The active state (High/Low) of the EOT limits is software selectable (by the EndOfTravelLimitSetup axis
parameter).
Figure 2-21
switches and the parameter setting to use for each configuration. Use NPN-type normally-closed limit
switches (Active High) to provide fail-safe behavior in the event of an open circuit.
www.aerotech.com
shows the possible wiring configurations for normally-open and normally-closed
Chapter 2: Installation and Configuration
Figure
2-23).
In/Out/Bi
Input
Output
N/A
N/A
Input
Input
51
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