9 Positioning Control
9.6 Variable Speed Operation
103
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
With acceleration/deceleration (when BFM#3 b7 or BFM#37 b7 is on)
Point
• Operation speed I does not change in the following cases
- During deceleration by the deceleration command (STOP, forward limit, reverse limit)
- During deceleration stop by operation command OFF
• When the variable speed operation command (with acceleration/deceleration) is turned off and the
operation command is turned on again during deceleration, the operation decelerates and stops once and
then accelerates again. After the deceleration and stop, READY turns on for an instant. Take note that
READY ON may possibly be detected depending on the timing.
• When operation speed I is started with 0, the pulse output is not executed, but READY turns OFF.
2. Rotation direction
The rotating direction is determined by the sign (positive/negative) of operation speed I.
• Operation speed Ι > 0: Forward
• Operation speed Ι < 0: Reverse
• When operation speed I = 0, or the absolute value of operation speed I < bias speed: Stop
Caution
An abrupt change in the rotation direction may cause damage to the machine. It may also cause an error
through motor overload.
To change the rotation direction, set operation speed I value to 0, and wait for the motor to stop completely
after stop.
If operation speed I value changes from positive to negative (e.g. 100 → -100), the work piece will stop, and
start reverse operation.
Point
When the sign (positive or negative) of the operation speed I is changed during the operation, the motor
immediately stops or decelerates and stops, and then starts rotation in the reverse direction within 1 ms in the
case of forward pulse/reverse pulse output or within 2 ms in the case of pulse/direction output.
3. Acceleration/deceleration speed setting of the variable speed operation
• When the acceleration/deceleration speed setting of the variable speed operation is off: Variable speed
operation without acceleration/deceleration
• When the acceleration/deceleration speed setting of the variable speed operation is on: Variable speed
operation with the acceleration/deceleration
a
d
Operation speed I
0
Speed
c
b
Time
(Does not change)
abc0d
Variable speed
operation
(BFM#25 b12)
READY
(BFM#28 b0)
Positioning
completion flag
(BFM#28 b8)
Operation speed I
(BFM#20, #19)
OFF ON OFF
ON OFF ON
Acceleration/
deceleration time
(Acceleration time)
Acceleration/
deceleration time
(Deceleration time)
Maximum speed
Bias speed
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