6 POSITIONING CONTROL

6.23.5Home position return by the count type 2

(1)Count type 2

After the proximity dog ON, the position which traveled the specified distance (travel value after proximity dog ON) is home position in this method.

It is not related for zero point pass or not pass. (If the proximity dog signal of servo amplifier is used, the count type 2 home position return cannot be executed.)

A count type 2 is effective method when a zero point signal cannot be taken. (However, dispersions will occur to the stop position at the home position return compared with the count type 1.)

The travel value after proximity dog ON is set in the home position return data (Refer to Section 6.23.1).

(2) Home position return by the count type 2

Operation of home position return by count type 2 is shown below.

V

Home position

Home position

return direction

return speed

(Note): After the proximity dog ON, a position which traveled the distance "travel value after proximity dog ON" of the

Creep speed home position return data is home position.

 

 

 

 

 

t

Home position

Proximity dog

 

 

 

 

 

 

 

 

The travel value in this range is stored in the

return start

 

 

 

 

 

monitor register "travel value after proximity dog

 

 

 

 

 

 

ON".

 

 

 

(Note): "Home position return re-travel value" = 0

Fig. 6.36 Home position return operation by the count type 2

(3) Home position return execution

Home position return by the count type 2 is executed using the servo program in

Section 6.23.16.

(4)Cautions

(a)Home position return and continuously start of home position return are also possible in the proximity dog ON in the count type 2.

When the home position return and continuously start of home position return are executed in the proximity dog ON, the home position return is executed after return the axis once to position of the proximity dog OFF.

(b)When the "travel value after proximity dog ON" is less than the deceleration distance from "home position return speed" to "creep speed", a minor error "an overrun occurred because the setting travel value is less than the deceleration distance at the proximity dog signal input during home position return of count type." (error code: 209) will occur and deceleration stop is made.

(c)Command position is the home position.

(d)If in-position signal (M2402+20n) does not turn ON, home position return is not ended.

6 - 205