Mitsubishi Electric MELSERVO-J2 Series Instruction Manual page 96

4. OPERATION
4.4.2 Dog type home position return
A home position return method using a proximity dog. With deceleration started at the front end of the
proximity dog, the position where the first Z-phase signal is given past the rear end of the dog or a motion
has been made over the home position shift distance starting from the Z-phase signal is defined as a home
position.
(1) Signals, parameters
Set the input signals and parameters as follows:
Manual home position return
mode selection
Dog type home position return
Home position return direction
Dog input polarity
Home position return speed
Creep speed
Home position shift distance
Home position return
acceleration/deceleration time
constants
Home position return position
data
(2) Length of proximity dog
To ensure that the Z-phase signal of the servo motor is generated during detection of the proximity
dog (DOG), the proximity dog should have the length which satisfies formulas (4.2) and (4.3):
V
L
1
60
L : Proximity dog length [mm]
1
V : Home position return speed [mm/min]
td : Deceleration time [s]
L 2 S.................................................................................... (4.3)
2
L : Proximity dog length [mm]
2
S : Moving distance per servo motor revolution [mm]
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Item
Automatic/manual selection (MD0)
Point table No. selection 1 (DI0)
Point table No. selection 2 (DI1)
Parameter No.8
Parameter No.8
Parameter No.8
Parameter No.9
Parameter No.10
Parameter No.11
Point table No.1
Parameter No.42
td .............................................................................. (4.2)
2
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Device/Parameter Used
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Description
Short MD0-SG (ON).
Open DI0-SG (OFF).
Open DI1-SG (OFF).
0 :Dog type home position return is
selected.
Refer to (3) in this section and choose
home position return direction.
Refer to (3) in this section and choose dog
input polarity.
Set speed until detection of dog.
Set speed after detection of dog.
Set when shifting the home position
starting at the first Z-phase signal after
passage of proximity dog rear end.
Use the acceleration/deceleration time
constants of point table No.1.
Set the current position at home position
return completion.