Ss actuator, Setting home position – IAI America SSCR User Manual
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SS Actuator
10. Setting Home Position
10.1 Principle of the Homing Operation
IA performs homing in the following manner.
The moving direction is determined by the parameters set by the homing command.
The software senses the mechanical end in the homing operation.
The slider reverses direction when this end is reached and the place where the Z phase signal is detected
becomes the reference point.
The slider travels further by an offset amount defined by the parameters and this position becomes home.
10.2 Fine Control of Home Position
The number of motor revolutions from the time the slider hits the stopper to when the Z phase signal is generated is
adjusted when the unit is shipped. The standard value of the backing distance when the slider hits the stopper, reverses
and then stops at the home position:
As long as the homing direction is the same, you can make fine adjustments to the home position for each actuator
by changing the parameters based on this value. Adjustments are made as follows:
Initiate the homing operation and confirm home.
After that, move to the desired home position, check the difference and adjust the parameters.
You can reset the parameters on the plus side in the advancing direction (minus direction is not allowed).
If you allow for ample offset amount the movement range is that much more limited. If the offset is greater
than 1mm, you will have to reset the stroke soft limit.
10.3 Changing Home Direction
If you change the home direction after the unit is delivered, the move direction parameter must be changed and you may
need to adjust the encoder Z-phase so please contact IAI.
Use the standard value set at the time of shipment for the home offset amount.
Initiate the homing operation.
As described in the preceding section, check to see that the home position is within 5mm from the end.
If the ball screw lead differs by more than 1/4 cycle, loosen the ball screw feed nut and remove it from the
slider, rotate the nut by that amount and then reattach it.
Perform the homing operation, then recheck the offset amount.
If necessary, use the parameters to fine tune the offset.
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