IAI America NS - Manual (Page 35)

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4. Options
4.3 Creep Sensor
This sensor is used to perform home return at high speed.
Since home return is implemented by causing the slider to contact the stroke-end stopper and then
reverse its direction, the home return speed is kept to a range of 10 to 20 mm/sec.
If the axis stroke is longer, the time required for home return becomes longer.
The creep sensor is a proximity sensor used to reduce the time required for home return.
The slider returns at high speed until immediately before the creep sensor and once the creep sensor
signal turns ON, the slider speed is lowered and home return is performed. Accordingly, less time is
required for home return.
4.4 Limit Switches
The limit switches are used to perform a home return operation by reversing the slider upon sensing by
the proximity sensor, not by letting the slider contact the mechanical stopper.
Three limit switches are installed including HOME (home side), +OT (over-travel on counter-motor side),
and –OT (over-travel on motor side).
You can use these limit switches to fine-tune the reversing position or increase the reliability of home
return.
Take note, however, that moving the limit switch on home side considerably away from the specified
position may shorten the stroke.
When home return is performed on an axis whose stroke is longer, it takes a
longer time for the axis to reach the mechanical end.
Creep sensor
A sensor is installed immediately before the mechanical end and once the sensor signal turns ON,
the speed is lowered and a normal home return operation is performed.