Dog Type Front End Reference Home Position Return Type - Mitsubishi Electric MELSERVO-J4 Series Instruction Manual

5. HOW TO USE THE PROGRAM

5.4.11 Dog type front end reference home position return type

The home position is where the machine moves the travel distance after proximity dog and the home
position shift distance from the front end of a proximity dog.
The home position return is available independently of the Z-phase signal. Changing the creep speed may
change the home position.
(1) Device/parameter
Set input devices and parameters as follows.
Item
Automatic operation mode of
the program method
Dog type front end reference
home position return
Home position return
direction
Dog input polarity
Home position return speed
Creep speed
Home position shift distance
Travel distance after proximity
dog
Home position return
acceleration time constant
Home position return
deceleration time constant
Home position return position
data
Program
POINT
This home position return method depends on the timing of reading DOG
(Proximity dog) that has detected the front end of a proximity dog. Therefore,
when a home position return is performed at a creep speed of 100 r/min, the
home position has an error of 6400 pulses (for HG series servo motor). The
higher the creep speed, the greater the error of the home position.
Used device/parameter
MD0 (Operation mode selection 1)
[Pr. PT04]
[Pr. PT04]
[Pr. PT29]
[Pr. PT05]
[Pr. PT06]
[Pr. PT07]
[Pr. PT09]
[Pr. PC30]
[Pr. PC31]
[Pr. PT08]
DI0 (Program No. selection 1) to
DI7 (Program No. selection 8)
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Setting
Switch on MD0.
_ _ _ 9: Select the dog type (front end detection/
front end reference).
Refer to section 5.4.1 (2) to select the home
position return direction.
Refer to section 5.4.1 (2) to select the dog input
polarity.
Set the rotation speed until a dog is detected.
Set the rotation speed after a dog is detected.
Set this item to move the home position set when
the Z-phase signal is given.
Set the travel distance specified after the front end
of the proximity dog is passed.
The acceleration time constant set for [Pr. PC30]
is used.
The deceleration time constant set for [Pr. PC31]
is used.
Set a current position at home position return
completion.
Select a program containing "ZRT" command that
performs a home position return.