Automatic Positioning To Home Position Function - Mitsubishi Electric MELSERVO-J4 Instruction Manual

4. HOW TO USE THE POINT TABLE

4.4.14 Automatic positioning to home position function

After power-on, if the home position return is performed again after the home position return is performed to
define the home position, this function enables automatic positioning to the home position rapidly. For the
absolute position system, the home position return is unnecessary after the power-on.
When the automatic positioning to the home position is performed at home position return incompletion, [AL.
90.1] will occur.
After the power-on, perform the home position return in advance.
Set input devices and parameters as follows.
Home position return mode
selection
Home position return speed
Home position return
acceleration/deceleration time
constant
Home position return
direction
Set the home position return speed of the automatic positioning to home position function with [Pr. PT05].
The data of point table No.1 is used for acceleration/deceleration time constants. Switching on reverse
rotation start (ST2) performs high-speed automatic return.
Set the rotation direction at the time of degree unit setting with home position return direction of [Pr. PT04].
The setting value of [Pr. PT08 Home position return position data] is used as the position address at the
home position return completion.
POINT
The automatic positioning to the home position cannot be performed from
outside the setting range of position data. In this case, perform the home
position return again using the home position return.
Item Used device/parameter
MD0 (Operation mode selection 1)
DI0 (Point table No. selection 1) to
DI7 (Point table No. selection 8)
[Pr. PT05]
Point table No. 1
[Pr. PT04]
MD0 (Operation mode selection 1)
Servo motor speed
ST1 (Forward rotation start)
ST2 (Reverse rotation start)
Switch on MD0.
Switch off DI0 to DI7.
Set the rotation speed until the dog is
detected.
Use the acceleration/deceleration time
constant of point table No. 1.
Set the rotation direction in degrees.
ON
Acceleration time
OFF
constant
Forward rotation
0 r/min
Reverse rotation
ON
OFF
ON
OFF
4 - 67
Setting
Deceleration time
constant
Home position
return speed
3 ms or shorter
Home position
5 ms or longer