Mitsubishi FX3U-20SSC-H User Manual page 69

FX -20SSC-H Positioning Block User's Manual
3U
2. Setting items
With DOG type mechanical zero return, specify the following settings.
Setting item
Zero return mode
Zero return speed (high speed)
Zero return speed (creep)
Zero return direction
DOG input selection
DOG input logic
Zero-point signal count start
timing
Zero-point signal count
Mechanical zero-point address
3. Dog search function
The zero return with DOG search is executable with forward/reverse rotation limit1 on the PLC side. At this
time, the zero return action varies in the following way according to the zero return starting position.
Speed
1) If the starting position is in the near point signal OFF area (before passing DOG)
a) Operation is conducted in the zero return direction at the zero return speed (high speed).
b) After the DOG detection, the deceleration to the zero return speed (creep) begins.
c) After detecting the zero-point signal count start timing, the zero-point signal is counted.
d) After counting the specified number of zero-point signals, the travel is stopped.
2) If the starting position is in the near point signal ON area
a) Operation is conducted at the zero return speed in the direction opposite to the zero return direction.
b) Upon the DOG detection (escaping from the DOG), the deceleration to stop begins.
c) Operation is conducted in the zero return direction at the zero return speed (high speed).
d) After the DOG is detected, deceleration to the zero return speed (creep) begins.
e) After counting the zero-point signal, the 20SSC-H stops.
3) If the starting position is in the near point signal OFF area (after passing DOG)
a) Operation is conducted in the zero return direction at the zero return speed (high speed).
b) Upon the forward/reverse rotation limit, the travel decelerates to stop.
c) Operation is conducted in the direction opposite to the zero return direction at the zero return speed
(high speed).
d) Upon the DOG detection (escaping from the DOG), the travel decelerates to stop.
The operation begins again in the zero return direction at the zero return speed (high speed).
e) After DOG detection, the travel decelerates to the zero return speed (creep speed) and, after counting
the zero-point signal, the 20SSC-H stops.
→ For details on the setting items, refer to Subsection 8.1.5
Specify the DOG type zero return mode.
Enter the zero return speed (high speed)
Specify the post-DOG-input zero return speed (creep).
Specify the zero return direction (the current value increase/decrease direction).
Select the DOG input (servo amplifier/20SSC-H) to be used.
Specify the logic (NO/NC contact) of the DOG input to be used.
Specify the timing (front/rear edge of DOG) to start counting the zero-point signal.
Specify the zero-point signal count.
Specify the current address (user unit) written after the mechanical zero return completion.
Reverse rotation limit
4) 3)
Zero-point
8.1 Mechanical Zero Return Control
Description
Zero return direction Forward
DOG
rotation limit
Reverse rotation
2)
1)
Forward rotation
8 Manual Control
Time
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