Finds HOME and moves a bit more

Question

using steppers in open-loop mode, when executing a Find Home, the axis
moves to home, hesitates (stops briefly), and then moves a few more
degrees of rotation in the same direction (maybe at a reduced speed,
but it is so small a motion that it is hard to tell). How do I get it
to stop and stay stopped?
My settings are:
initial search direction:   forward
find approach direction:   forward
home edge to stop on:   forward
approach velocity:   20%
offset move:   0
Reset:   not checked
smart enable:   checked
TIA
lmd2
Lawrence M. David Jr.
Certified LabVIEW Architect
cell: 516.819.9711
http://www.aleconsultants.com
[email protected]

Answer 1

What you see is expected and intended behavior. Find Home is not a
single move but a sequence of moves. A home switch provides four
positions where to stop the axis. This behavior is well documented in
the NI-Motion help files.
Here is an example (copied from the NI-Motion VI Help):
As shown in the following figure, this Find Home sequence searches
for the home input in the forward direction (1). When the home input is found,
the reverse edge (2) is located. When the reverse edge is located, this edge is
approached in the forward direction (3).
I hope that helps.
Best regards,
Jochen Klier
National Instruments Germany
Message Edited by Jochen on 08-30-2005 04:51 PM
Attachments:
find_home.jpg ‏31 KB