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

5. HOW TO USE THE PROGRAM

5.4.8 Count type front end reference home position return

(1) Device/parameter
Set input devices and parameters as shown below.
Item
Automatic operation mode of
the program method
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 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.
After the front end of a proximity dog is detected, when a home position return
ends without reaching the creep speed, [AL. 90.2] 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.
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]
DI1 (Program No. selection 1) to
DI7 (Program No. selection 8)
Switch on MD0.
_ _ _ 6: Select the count type front end reference.
Refer to (2) of section 5.4.1 to select the home
position return direction.
Refer to (2) of section 5.4.1 to select the dog input
polarity.
Set the rotation speed specified until a dog is
detected.
Set the rotation speed specified after a 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.
The acceleration time constant set for [Pr. PC30]
is used.
The deceleration time constant set for [Pr. PC31]
is used.
Set the current position at the home position return
completion.
Select a program containing a "ZRT" command,
which performs the home position return.
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Setting