IAI America SCON-C - Manual (Page 199)

181
Appendix
 Home Return Offset,  Home Preset
For both the home return offset (No. 22) and home preset (No. 139), an optimal value has been set to ensure a
constant distance from the mechanical end to the home.
The minimum setting unit is “0.01 [mm].”
Adjust these parameters in the following conditions:
[1] Want to align the actuator home and the system’s mechanical home after the actuator has been assembled
into the system
[2] Want to set a new home after reversing the factory-set home direction
[3] Want to eliminate a slight deviation generated after replacing the actuator
[Adjustment]
[1] If your actuator is of incremental specification, adjust only the home return offset and set the home preset to
“0.”
[2] If your actuator is of absolute specification, adjust both the home return offset and home preset.
Set appropriate values so that the following relationships will be achieved:
0 <
(Home return offset + Home preset) < Lead
(Note) For the home preset, you can only set a multiple of the lead or “0.”
[Example]
Lead: 4 mm, Home return offset: 10 mm, Home preset: -8 mm
Caution: If the home return offset has been changed, the soft limit parameters must also be adjusted
accordingly.
: Notes on absolute encoder
If the home offset is set to a value close to an integer multiple of the phase-Z-to-phase-Z distance
(lead) (including a case where the home return offset is set to “0”), the actuator will enter a servo lock
mode at the phase-Z point when an absolute reset is performed, in which case the coordinates may
become offset by the phase-Z-to-phase-Z distance (lead).
For the above reason, never set a home offset close to an integer multiple of the phase-Z-to-phase-
Z distance (lead).
(Ensure a sufficient allowance with respect to the servo amplitude.)
Lead (4 mm) Lead (4 mm) Lead (4 mm)
Home Return Offset (10 mm)
Home Preset (-8 mm)
Home return is
completed here
Home position