IAI ssel, Operation Manual

Page: 411 / 497

385
Appendix
Set a home offset
Axis-specific parameter No. 21, “Offset travel distance at home return”
No. Parameter name Default value Input range Unit
21 Offset travel distance at home return 1000 -99999999 ~ 99999999 0.001 mm

Explanation of setting
An offset can be set that will be applied after detecting phase Z (point 0) during home return.
* If the home position has shifted after replacing the motor, jig, etc., use this parameter to adjust the
home.

Setting value
Setting unit: 0.001 mm
Example:
Set the offset to 0.5 mm = 500

Note
If the offset travel distance is near an integer multiple of the ball screw lead (such as 0, 6, 12 or 18 mm
when the lead is 6 mm), the home will come directly above phase Z and thus rotation data may shift by
one revolution upon absolute reset due to an “unstable” servo lock condition (a phenomenon where the
coordinate values shift by one motor revolution). In this case, the position after home return will
become the integer multiple of the lead length.
* If the position after home return has become an integer multiple of the lead value, make adjustment
using axis-specific parameter No. 12, “Home preset value.”