8 Manual Control
8.3 Mechanical Zero Return Operation
87
FX3U-1PG User's Manual
1
Introduction
2
Specification
3
System
Configuration
4
Installation
5
Wiring
6
Before Starting
Positioning
Operation
7
Buffer Memory
8
Manual Control
9
Positioning
Control
10
Program
Example
8. DOG search function
When the forward limit/reverse limit is set, zero return operation by DOG search function becomes possible.
The zero return operation becomes as follows according to the zero return start position.
In addition, operation at the forward limit/reverse limit follows the operation set in the limit deceleration mode
(BFM#3 b11 or BFM#37 b11).
DOG search function operation
1) When DOG signal is OFF at starting position (before passing the DOG)
a) Operates in the zero return direction at the zero return speed (high speed)
b) After the DOG detection, deceleration starts to the zero return speed (creep).
c) After detection of the zero-point signal count start point, the zero-point signal count starts.
d) When the zero-point signal of the specified number (zero-point signal number) is counted, the
operation stops.
2) When DOG signal is ON at starting position (within the DOG)
a) Operates in the direction opposite of the zero return direction at the zero return speed (high speed)
b) The operation decelerates and stops when it moves outside of the DOG.
c) Operates in the zero return direction at the zero return speed (high speed)
d) After the DOG detection, deceleration starts to the zero return speed (creep)
e) The operation stops when the zero-point signal of the specified number (zero-point signal number) is
counted.
3) When DOG signal is OFF at starting position (after passing the DOG)
a) Operates in the zero return direction at the zero return speed (high speed)
b) The operation immediately stops or decelerates to stop at the reverse limit/forward limit.
c) Operates in the direction opposite of the zero return direction at the zero return speed (high speed)
d) The operation decelerates and stops when it moves outside of the DOG.
e) Operates in the zero return direction at the zero return speed (high speed)
f) After the DOG detection, deceleration starts to the zero return speed (creep)
g) The operation stops when the zero-point signal of the specified number (zero-point signal number) is
counted.
4) When the reverse limit/forward limit in the zero return direction is on
a) Operates in the direction opposite of the zero return direction at the zero return speed (high speed)
b) The operation decelerates and stops when it moves outside of the DOG.
c) Operates in the zero return direction at the zero return speed (high speed)
d) After the DOG detection, deceleration starts to the zero return speed (creep)
e) The operation stops when the zero-point signal of the specified number (zero-point signal number) is
counted.
Caution
If the DOG is not detected during the DOG search operations, a forward limit/reverse limit error occurs.
Reverse limit
Zero-
point
DOG
Zero return direction
1)2)3)4)
Position
Forward limit
In case of immediate stop
In case of deceleration stop
Limit deceleration mode
Speed
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