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

FX -20SSC-H Positioning Block User's Manual
3U
4) When the limit switch (forward or reverse rotation limit) in the zero return direction turns ON
a) The operation is conducted in the direction opposite to the zero return direction at the zero return
speed (high speed).
b) Upon the DOG detection (escaping from the DOG), the travel decelerates to stop.
c) The operation is conducted again in the zero return direction at the zero return speed (high speed).
d) Upon the DOG detection, the travel decelerates to the zero return speed (creep speed) and after
counting the zero-point signal, the 20SSC-H stops.
Caution
If the DOG is not detected during the DOG search operations, a limit error occurs.
4. Changing the zero return speed
Use the override function or operation speed change function to change the zero return speed (high speed).
However, the speed does not change when the operation speed change disable flag is ON.
8.1.3

Data-set type mechanical zero return

Use the data-set type mechanical zero return procedure to set the position moved by JOG or manual pulse
generator operation, as a zero-point. Therefore the work piece does not travel at the mechanical zero return
command.
This zero return procedure is frequently used for equipment without a DOG, or for transfer lines without a
mechanical zero-point.
1. Operation
1) With JOG or manual pulse generator operation, the work piece moves to the desired zero-point.
2) Reboot the mechanical zero return command.
3) Write the mechanical zero-point address, specified in positioning parameters to the current address.
4) Set the zero return execution flag.
In the data-set type mechanical zero return, the positioning completion flag does not turn ON.
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.)
2. Setting items
In the data-set type zero return, specify the following settings.
Setting item
Zero return mode
Mechanical zero return address
64
→ For the override function, refer to Subsection 7.5.1
→ For the operation speed change function, refer to Subsection 7.5.2
→ For details on the setting items, refer to Subsection 8.1.5
Specify the data-set type zero return mode.
Specify the current address (user unit) after the mechanical zero return completion.
8.1 Mechanical Zero Return Control
Description
8 Manual Control