CONTREX M-Traverse - Manual (Page 97)

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HOME RETURN
If “Home” has been established through either Home Set or Home Seek, then Home
Return can return the Follower mechanism to “Home”. When the Home Return input is
closed, the Follower mechanism makes a profiled move at jog speed until it aligns with
“Home”.
The Follower mechanism will move toward “Home”, in either the reverse or forward
direction, depending on which direction is closer to “Home”. When the Follower
mechanism travels in the reverse direction to locate “Home”, it ramps down at the
Accel/Decel rate (CP-60) to zero. This causes the Follower mechanism to overshoot
the Home Sync sensor by a distance that is equal to the At-Home Band (CP-30). The
M–Traverse compensates with a forward, triangulated Accel/Decel move that aligns the
Follower mechanism with “Home”.
Jog Speed
(CP-61)
Accel/Decel (CP-60)
Accel/Decel
(CP-60)
Start Here
Forward
Limit
Reverse
Limit
Home
Sync
Sensor
At-Home
Band
(CP-30)
When the Follower mechanism travels in the forward direction to locate “Home”, it
decelerates directly down to the “Home” position from a predetermined position that
ramps the Follower directly to the “Home” position.
Jog Speed
(CP-61)
Accel/Decel
(CP-60)
Accel/Decel
(CP-60)
Start Here
Forward
Limit
Reverse
Limit
Home
Sync
Sensor
Home Return enables the Drive Enable logic output, which allows the Follower
mechanism to hold its position at “Home” despite any outside force (such as gravity).
The Home Return is a momentary input that is edge triggered and is activated through
the Home Return input (J4, pin 3, 4). Home Seek is internally latched and does not
need to be maintained by an operator device.