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

FX -20SSC-H Positioning Block User's Manual
3U
8.1.4

Stopper type mechanical zero return

The stopper position is defined as the zero-point. The stopper type mechanical zero return includes the
following two types (modes).
• Stopper type (1)
This mechanical zero return method uses the DOG signal and stopper.
High speed travel is possible up to the DOG signal, thus reducing the time for mechanical zero return.
• Stopper type (2)
This mechanical zero return method (creep speed only) uses only the stopper.
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.)
1. Stopper type (1) operation
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 work piece hits the stopper, and the work piece stops when the servomotor torque reaches the zero
return torque limit value.
4) After the stop point, the 20SSC-H writes the mechanical zero point address, specified in the positioning
parameters, to the current address.
5) The 20SSC-H turns the positioning completion flag ON and sets (turns ON) the zero return complete
flag.
DOG position
Install the DOG at a position far enough from the stopper for the work piece to decelerate to the zero-point
return speed (creep).
74
Acceleration time
Speed
Maximum speed
Zero return speed
(high speed)
1)
ON
OFF
OFF
OFF
→ ON) of the mechanical zero return command, the work piece moves in the
Deceleration time
Zero return speed (creep)
2)
3)
Stopped due to torque limit
DOG
Zero return torque limit
The travel value
8 Manual Control
8.1 Mechanical Zero Return Control
Time
ON
ON
Mechanical zero point address