Dog Type Home Position Return - Mitsubishi Electric Melservo-J2-SUPER series Instruction Manual

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, parameters and program as follows:
Item
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
Program
(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 td .............................................................................. (4.2)
L
1
60 2
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]
Device/Parameter used
Automatic/manual selection (MD0)
Parameter No.8
Parameter No.8
Parameter No.8
Parameter No.9
Parameter No.10
Parameter No.11
Parameter No.41
Parameter No.42
Select the program including the "ZRT"
command that executes a home position
return.
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Description
MD0 is switched on.
0 :Dog type home position return is
selected.
Refer to Section 4.4.1 (2) in this section
and choose home position return
direction.
Refer to Section 4.4.1 (2) 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 set in parameter No. 41.
Used to set the current position on
completion of home position return.