Aerotech XC2, Hardware Manual

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XC2 Hardware Manual Chapter 2: Installation and Configuration
2.3.5. End of Travel Limit Input Interface
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 2-23 ).
Table 2-18: End of Travel Limit Input Pins on the Feedback Connector
Pin # Description In/Out/Bi
12 Clockwise End of Travel Limit Input
16
+5V Power
(1)
Output
20 Signal Common N/A
21 Signal Common N/A
22 Home Switch Input Input
24 Counterclockwise End of Travel Limit Input
Aerotech recommends that you use NPN-type normally-closed limit switches and select Active High for this
option. This configuration provides fail-safe limit behavior in the even of an open circuit. PNP type limit
switches can also be used and will require an external pull-down resistor as shown in
Figure 2-21 .
The active state of the EOT limits is software selectable (by the EndOfTravelLimitSetup axis parameter).
Figure 2-21 shows the possible wiring configurations for normally-open and normally-closed switches and
the parameter setting to use for each configuration.
NOTE: Because they are not fail-safe, we can not recommend using Normally-open switch configurations.
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