Dog Type Mechanical Zero Return - Mitsubishi FX3U-20SSC-H User Manual

FX -20SSC-H Positioning Block User's Manual
3U
8.1.2

DOG type mechanical zero return

With the DOG type mechanical zero return, the 20SSC-H sets the zero-point position after the module stops
with a near-point DOG signal and servo motor zero-point signal. Use the DOG search function to execute the
DOG type mechanical zero return arbitrarily.
1. Operation
Zero return starts as follows, at the rising edge (OFF
Mechanical zero return command
Positioning completion
Zero return completion
Current address (user)
Current address (pulse)
1) At the rising edge (OFF
zero return direction at the zero return speed (high speed).
2) At the DOG input, the 20SSC-H decelerates the work piece to the zero return speed (creep).
3) The 20SSC-H counts zero-point signals after passing the zero-point signal count start timing.
4) After counting the specified number (zero-point signal numbers), the 20SSC-H stops the work piece.
5) After the zero-point is reached, the work piece does not travel with the mechanical zero return
command.
6) The 20SSC-H turns the positioning completion flag ON and sets the zero return complete flag.
Note
• The zero return command is not accepted if the zero-point pass signal servo status is OFF.
Before executing zero return, be sure to rotate the servomotor at least once to turn the zero-point pass
signal ON. The zero-point pass signal turns ON when the motor passes the motor reference position signal
(Z-phase).
To execute zero return immediately after power-on, specify "1: Motor Z-phase pass unnecessary after
power-on" (default setting) at servo parameter function selection C-4. With this setting, the zero-point pass
signal turns ON even if the motor does not pass the zero-point (Z-phase).
• With the simultaneous start flag ON, the X-axis mechanical zero return command simultaneously starts the
X and Y-axes mechanical zero return operation.
(The 20SSC-H ignores the Y-axis mechanical zero return command.)
Precautions when setting the DOG input logic
An incorrect DOG input logic state will disable the correct operation. Pay close attention when changing the
initial setting value.
Acceleration time
Speed
Maximum speed
Zero return speed
(high speed)
1)
Zero point signal
ON
OFF
OFF
OFF
→ ON) of the mechanical zero return command, the work piece moves in the
→ ON) of the mechanical zero return command.
Deceleration time
2)
Zero return speed (creep)
DOG
The travel value
8 Manual Control
8.1 Mechanical Zero Return Control
Mechanical zero
point address
4)
Time
ON
ON
Mechanical zero point address
1
2
3
4
5
6
7
8
9
10
71