LG Electronics 120S user manual Return to OriginPOSORG Rising edge ↑, Origin return method

Chapter 7 Usage of Various Functions

7)Return to Origin(POSORG : Rising edge ↑)

•Return to Origin (homing) is carried out to confirm the origin of the machine when applying the power.

•In case of Return to Origin, it is required to set Return to Origin parameter for each axis.

•If the origin position is determined by origin return, the origin detection signal is not recognized during positioning operation.

(1)Origin return method

•Method by approximate origin (approach DOG)

-Origin return processing method by approximate origin (approach DOG) has 3 kinds of method as follows.

(A)Origin detection when approximate origin turns off

(B)Origin detection after deceleration when approximate origin turns on

(C)Origin detection by approximate origin

•The items that effects to the origin return from parameter are as follows.

(A)Origin return speed (high speed, low speed)

(B)Origin return dwell time

(2)Origin Detection when Approximate origin turns off

This is the method using the approximate origin and origin signal and the action by origin return command(POSORG) is as follows.

(A)It accelerates to the setting origin return direction and acts by origin return high speed.

(B)In this case, if approximate origin as external input is entered, it decelerates and acts by origin return low speed.

(C)If origin signal as external input is entered after the approximate origin signal has changed from ”On” to “Off”, it stops.

Speed

Origin return high speed Deceleration when approximate return “ON”

Origin return low speed

Time

Transfer amount after approximate origin “ON”

Approximate origin signal		While the approximate origin “ON”,
		the origin will not be determined by
Origin signal		the origin signal.
	1 rotation of SERVO motor (PG1 rotation)

Origin return command

7-80