16.12.9 Count type front end reference home position return
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. 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.
(1) Device/parameter
Set input devices and parameters as shown below.
Automatic operation mode of
the program method
MD0 (Operation mode selection 1)
Count type front end
reference home position
return
_ _ _ 6: Select the count type (front end detection/
front end reference).
Home position return
direction
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.
Home position return speed
Set the rotation speed specified until a dog is
detected.
Set the rotation speed specified after a dog is
detected.
Home position shift distance
Set this to shift the home position, which is
specified after the front end of a proximity dog is
passed.
Travel distance after
proximity dog
Set the travel distance specified after the front end
of the proximity dog is passed.
Home position return
acceleration time constant
The acceleration time constant set for [Pr. PC30]
is used.
Home position return
deceleration time constant
The deceleration time constant set for [Pr. PC31]
is used.
Home position return position
data
Set the current position at the home position return
completion.
DI0 (Program No. selection 1) to
DI7 (Program No. selection 8)
Select a program containing a "ZRT" command,
which performs the home position return.
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