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

4. HOW TO USE THE POINT TABLE

4.4.8 Count type front end reference home position return

Deceleration starts at the front end of a proximity dog. The position is shifted by the travel distance after
proximity dog and the home position shift distance. The position after the shifts is used as the home position.
The home position return is available independently of the Z-phase signal. Changing the home position
return speed may change the home position.
(1) Device/parameter
Set input devices and parameters as follows.
Home position return mode
selection
Count 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/deceleration time
constant
Home position return position
data
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 Home position return speed of
100 r/min, the home position has an error of 6400 pulses (for HG series servo
motor). The higher the Home position return speed, the greater the error of the
home position.
After the front end of a proximity dog is detected, when a home position return
ends without reaching the creep speed, [AL. 90] occurs. Set the travel distance
after proximity dog and the home position shift distance enough for deceleration
from the home position return speed to the creep speed.
Item Used device/parameter
MD0 (Operation mode selection 1)
DI0 (Point table No. selection 1) to
DI7 (Point table No. selection 8)
[Pr. PT04]
[Pr. PT04]
[Pr. PT29]
[Pr. PT05]
[Pr. PT06]
[Pr. PT07]
[Pr. PT09]
Point table No. 1
[Pr. PT08]
Switch on MD0.
Switch off DI0 to DI7.
_ _ _ 6: Select the count type front end
reference.
Refer to section 4.4.1 (2) to select the home
position return direction.
Refer to section 4.4.1 (2) to select the dog
input polarity.
Set the rotation speed until the dog is
detected.
Set the rotation speed after the dog is
detected.
Set this item to shift the home position, which
is specified after the rear end of a proximity
dog is passed.
Set the travel distance specified after the rear
end of a proximity dog is passed.
Use the acceleration/deceleration time
constant of point table No. 1.
Set the current position at the home position
return completion.
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Setting