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MELSEC-Q
12 CONTROL SUB FUNCTIONS
[2] "Acceleration/deceleration method setting" control details and
setting
In the "acceleration/deceleration method setting", the acceleration/deceleration
processing method is selected and set. The set acceleration/deceleration
processing is applied to all acceleration/deceleration (except for inching operation
and manual pulse generator operation).
The two types of "acceleration/deceleration method setting" are shown below.
(1) Trapezoidal acceleration/deceleration processing method
This is a method in which linear acceleration/deceleration is carried out
based on the acceleration time, deceleration time, and speed limit value set
by the user.
elocity
Time
Fig. 12.48 Trapezoidal acceleration/deceleration processing method
(2) S-curve acceleration/deceleration processing method
In this method, the motor burden is reduced during starting and stopping.
This is a method in which acceleration/deceleration is carried out gradually,
based on the acceleration time, deceleration time, speed limit value, and
"
Pr.35
S-curve ratio" (1 to 100%) set by the user.
When the stepping motor is used, the acceleration around the inflection
point on the s shape is faster compared with the trapezoidal
acceleration/deceleration. This may cause step-out.
1
In this case, adjust the acceleration/deceleration time to decrease the
acceleration around the inflection point, or use a servo motor.
1: When comparing the trapezoidal acceleration/deceleration and S-curve
acceleration/deceleration processing method in the same
acceleration/deceleration time.
Velocity
Time
Fig. 12.47 S-curve acceleration/deceleration processing method
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