IAI America SSPA - Manual (Page 54)

9. Setting the Home Position
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9. Setting the Home Position
9.1 Home Return
Home return involves the operation explained below:
[1] When a home return command is issued, the actuator moves (in the direction set by the applicable
parameter).
[2] The software detects the mechanical end in the return operation. If option L (home limit switch) is installed,
the mechanical end is detected by a sensor.
[3] The slider reverses its direction when the mechanical end or home limit switch is detected, after which the
Z-phase signal is detected and the position where this signal has been detected becomes the reference
point.
[4] The slider travels further by the offset amount set by the parameter, and this position becomes home.
9.2 Factory-set Home Position
How much the motor would turn after the mechanical end or home limit switch is detected until the Z-phase signal
is generated has been adjusted prior to shipment.
The standard distance travelled by each slider after it reverses its direction upon detection of the mechanical end
or home limit switch, until stopping at the home position, is shown in the table below.
Model name
Home position from mechanical stopper
or home sensor
(approx. in mm)
ISB, ISPB Small type SXM/SXL
Medium type MXM/MXL/MXMX
Large type LXM/LXL/LXMX/LXUMX
5 mm
SSPA Small type SXM
Medium type MXM
5 mm
SSPA Large type LXM 10 mm
9.3 Changing the Home Direction
If the home direction is changed after the actuator has been delivered, the moving direction parameter must be
changed, and the encoder’s Z-phase may also need to be adjusted on some models. Contact IAI.