Overtravel Switch
home position _!!JJ:()_llgh the use of an e~coder marker pulse
L If the Home Switch is open (indicating a pos1tion on the positive side of home)
when the command is received, the axis is accelerated in the negative direction at
---- • the JOG ACCELERATION rate and moved at the FAST JOG VELOCITY until
the Home Switch closes.
Note that a mechanical home-position limit switch is usually not repeatabzv accurate enough jor this application. The encoder reference or marker pulse has much greater repeat accuracy and is therefore a better reference point to estab lish a starting point for subsequent measurements. The home limit switch is used to signal the control that the next marker pulse signal received is "Home., in multi-turn encoder applications.