IAI America RCS3PCR-SS8C - Manual (Page 72)

7. Setting the Home
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7. Setting the Home
7.1 Home Return
Home return consists of the following operations:
[1] When a home command is issued, the actuator moves in the direction set by the moving direction
parameter.
[2] The actuator detects the mechanical end via software.
[3] At the mechanical end, the actuator reverses its direction and moves until a Z-phase signal is detected,
where the reference point is set.
[4] The actuator moves further by the offset set by the applicable parameter, and the achieved position is set
as the home.
7.2 Fine-tuning the Home Position
How much the motor should turn after the stopper is contacted until a Z-phase signal generates has been
adjusted prior to shipment. The table below lists standard values set on respective models for the distance
travelled after the slider contacts and reverses its direction at the stopper, until it stops at the home.
Model name
Distance to home from
mechanical stopper or
home sensor (approx.
value in mm)
SA4C, SA5C, SA6C, SA7C, SA4R, SA5R,
SA6R, SA7R, SA8C, SS8C
3 mm
SA4D 2.2 mm
SA5D, SA6D 3 mm
RCS2RCS2CR
SS7C, SS8C, SA7R, SS8R 5 mm
RCS3(P)RCS3(P)CR SA8C, SA8R, SS8C, SS8R 3 mm
As long as the direction of home return remains the same, the home position of each actuator can be fine-tuned
by changing the parameter. Follow the procedure below to fine-tune the home position:
[1] Perform home return to check the current home.
[2] Next, move to a desired home, check the difference between the two homes, and then correct the home
preset parameter if you are using an XSEL or SSEL controller, or correct the home return offset parameter
if you are using a SCON controller, accordingly.
Add or subtract the difference to/from the value currently set.
[3] If a large offset is specified, the moving range will be reduced by the corresponding amount.
If an offset beyond 1 mm is set, adjust the stroke limits.
7.3 Changing the Direction of Home
To change the direction of home on the delivered actuator, the moving direction parameter, and also the
encoder’s Z-phase on some models, must be adjusted. Consult IAI for details.