Mitsubishi MR-JE-40A - Count Type Home Position Return

5. HOW TO USE THE PROGRAM
5 - 42
5.4.3 Count type home position return
For the count type home position return, after the front end of the proximity dog is detected, the position is
shifted by the distance set in [Pr. PT09 Travel distance after proximity dog]. Then, the position specified by
the first Z-phase signal is used as the home position. Therefore, when the on-time of DOG (Proximity dog) is
10 ms or more, the length of the proximity dog has no restrictions. Use the count type home position return
when you cannot use the dog type home position return because the length of the proximity dog cannot be
reserved, when you input DOG (Proximity dog) electrically from the controller, or other cases.
(1) Device/parameter
Set input devices and parameters as follows:
Item Device/parameter to be used Setting
Automatic operation mode of
the program method
MD0 (Operation mode selection 1) Switch on MD0.
Count type home position
return
[Pr. PT04]
_ _ _ 1: Select the count type (front end detection
Z-phase reference).
Home position return
direction
[Pr. PT04]
Refer to section 5.4.1 (2) to select the home
position return direction.
Dog input polarity [Pr. PT29]
Refer to section 5.4.1 (2) to select the dog input
polarity.
Home position return speed [Pr. PT05]
Set the rotation speed specified until a dog is
detected.
Creep speed [Pr. PT06]
Set the rotation speed specified after a dog is
detected.
Home position shift distance [Pr. PT07]
After the front end of the proximity dog is passed,
the position is shifted by the travel distance and
then is specified by the first Z-phase signal. Set
this to shift the position of the first Z-phase signal.
Travel distance after proximity
dog
[Pr. PT09]
Set the travel distance specified after the front end
of the proximity dog is passed.
Acceleration time constant of
home position return
[Pr. PC30]
The acceleration time constant set for [Pr. PC30]
is used.
Deceleration time constant of
home position return
[Pr. PC31]
The deceleration time constant set for [Pr. PC31]
is used.
Home position return position
data
[Pr. PT08]
Set the current position when the home position
return completed.
Program
DI0 (Program No. selection 1) to
DI3 (Program No. selection 4)
Select a program containing a "ZRT" command,
which performs the home position return.