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SMD23E2 and SMD24E2 User’s Manual
H
OMING
AN
SMD23E2
OR
SMD24E2
57
Homing Profiles (continued)
Profile with Overtravel Limit
Figure R4.3 below shows the move profile generated by a CW Find Home command when you use:
CW Overtravel Limit
Home Input without the Backplane_Proximity_Bit
The profile is generated when you encounter an overtravel limit in the direction of travel. (In this example,
hitting the CW limit while traveling in the CW direction.)
The SMD23E2 or SMD24E2 will stop and issue a
Home Invalid
error to your host if you acti-
vate the overtravel limit associated with travel in the opposite direction. i.e. Activating the
CCW limit during a CW Find Home command. This can occur if the overtravel limits are not
wired to the unit correctly, or not configured correctly when the unit was configured.
Figure R4.3 Profile with Overtravel Limit
1) Acceleration from the configured Starting Speed to the Programmed Speed
2) Run at the Programmed Speed
3) Hit CW Limit and immediately stop, followed by a two second delay.
4) Acceleration to the Programmed Speed opposite to the requested direction.
5) Run opposite the requested direction until the Home Input transitions from Active to Inactive
6) Deceleration to the Starting Speed and stop, followed by a two second delay.
7) Return to the Home Input at the configured Starting Speed. Stop when the Home Input transitions
from Inactive to Active.
If the overtravel limit is active when the Find Home Command is issued, the profile will begin
at step 4.
(CW)
(CCW)
S
PE
E
D
POSITION
Home
Limit
Switch
CW
Overtravel
Limit
