6 POSITIONING CONTROL

(4)Cautions

(a)Keep the proximity dog ON during deceleration from the home position return speed to the creep speed.

If the proximity dog turns OFF before deceleration to the creep speed, a deceleration stop is made and the next zero point is set as the home position.

Home position return speed

The zero point is passed during deceleration stop by the proximity dog OFF.

Setting creep speed

Proximity dog

ON OFF

Zero point

Zero point of this range does not become the home position.

The next zero point becomes the home position.

(b)The position executed deceleration stop by the proximity dog OFF is near zero point, a home position discrepancy equivalent to one revolution of the servomotor may occur. Adjust the position of proximity dog OFF, such that the home position return re-travel value becomes half the travel value for one revolution of the servomotor.

If the position executed deceleration stop by the proximity dog OFF is near zero point, the creep speed and deceleration settings may result in a home position discrepancy equivalent to one revolution of the servomotor.

Proximity dog

ON OFF

Zero point

POINT

When the home position return retry function is not set in the following cases, execute the home position return, after return the axis once to position before the proximity dog ON by the JOG operation, etc.

Home position return cannot be executed without returning to position before the proximity dog ON.

(1)Home position return with a position after the proximity dog ON to OFF.

(2)When the power supply turned OFF to ON after home position return end.

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