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4. OPERATION
4.7.11 Dog type front end reference home position return method
POINT
This home position return method depends on the timing of reading Proximity
dog (DOG) that has detected the front end of a proximity dog. Hence, if a
home position return is made at the creep speed of 100r/min, an error of
400 pulses will occur in the home position. The error of the home position is
larger as the creep speed is higher.
The home position is defined to be where the axis has moved the after-proximity dog moving distance and
home position shift distance from the front end of a proximity dog. A home position return that does not depend
on the Z-phase signal can be made. The home position may change if the creep speed varies.
(1) Devices, parameters
Set the input devices and parameters as indicated below.
Item Device/Parameter used Description
Manual home position return mode
selection
Automatic/manual selection (MD0) Turn MD0 ON.
(Note)
Point table No. selection 1 to 8
(DI0 to DI7)
DI0 to DI7 are turned off.
Dog cradle type home position return Parameter No.PC02 9: Select the dog cradle type.
Home position return direction Parameter No.PC03
Refer to (2) in this section and select the home
position return direction.
Dog input polarity Parameter No.PD16
Refer to (2) in this section and select the dog
input polarity.
Home position return speed Parameter No.PC04 Set the speed till the dog is detected.
Creep speed Parameter No.PC05 Set the speed after the dog is detected.
Home position shift distance Parameter No.PC06
Set when the home position is moved from the
Z-phase signal position.
Home position return
acceleration/deceleration time
constants
Point table No.1
Use the acceleration/deceleration time constant
of point table No. 1.
Home position return position data Parameter No.PC07
Set the current position at home position return
completion.
Note. This setting is for when the point table is used. When using the BCD input, turn SP0 to 3 OFF.