IAI America LSAS-N15HM - Manual (Page 58)

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1. Notes on Operation
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11.2 Home Return
11.2.1 Incremental Specification
(1) Operating Principles of Home Return
Home return is performed in the sequence specified below.
[1] When a home return command is issued, the moving direction is determined from the specified
parameter.
[2] A mechanical end is detected by software during home return.
[3] The actuator reverses upon detecting a mechanical end, and then recognizes the position where a
phase Z signal is detected as the reference point.
[4] The actuator moves further by the offset specified by the applicable parameter and recognizes the
achieved position as the home.
(2) Fine-tuning the Home Position
The amount of motor movement from the time when the slider hits the stopper until a phase Z signal is
generated is pre-adjusted at the time of shipment.
The table below lists the standard reversing distance for each model from the time when the slider hits the
stopper and then reverses until it stops at the home position.
Model Reversing distance
N10SS, N10SM Approx. 5.5 mm
N15SS, N15SM, N15HS, N15HM Approx. 5 mm
N19SS, N19SM Approx. 10 mm
If the home return direction remains the same, changing the parameter based on this value allows you to
fine-tune the home position of your actuator. Perform this fine-tuning by following the procedure below.
[1] Perform home return to check the home.
[2] Thereafter, move the actuator to a desired home. Check the difference and correct the parameter
accordingly. The parameter accepts a positive value to set an offset in the moving direction of the
actuator. (Negative values cannot be set.)
[3] Increasing the offset reduces the moving range by the increased amount. If you have specified an
offset exceeding 1 mm, also adjust the soft stroke limits.
(3) Changing the Home Direction
Changing the factory-set home direction after the delivery requires certain changes, such as changing the
moving direction parameter. Please consult IAI.
Warning: Never touch the encoder by hands.
The encoder not only detects position and home signals, but it also plays an
important role in the switching of AC-servo power phases. The AC-servo power
phases have been adjusted precisely.