Aerotech Automation1 XR3 Series, Hardware Manual

Page: 50 / 104

2.3.5. 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
Figure 2-22 ).
Table 2-16: End of Travel and Home Limit Pins on the Feedback Connector
Pin # Description In/Out/Bi
12 Clockwise End of Travel Limit Input
16 +5V Power N/A
20 Signal Common N/A
21 Signal Common N/A
22 Home Switch Input Input
24 Counterclockwise End of Travel Limit Input
The active state (High/Low) of the EOT limits is software selectable (by the EndOfTravelLimitSetup axis
parameter).
Figure 2-20 shows the possible wiring configurations for normally-open and normally-closed
switches and the parameter setting to use for each configuration.
IMPORTANT : Use NPN-type normally-closed limit switches (Active High) to provide fail-
safe behavior in the event of an open circuit.
2.3.5. End of Travel and Home Limit Inputs XR3 Hardware Manual
50 www.aerotech.com