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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.
The two types of "acceleration/deceleration method setting" are shown below.
(1) Automatic 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.
V
elocity
Time
Fig. 12.45 Automatic trapezoidal acceleration/deceleration processing method
(2) S-pattern 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-pattern proportion" (1 to 100%) set by the user.
When the stepping motor is used, the S-pattern acceleration/deceleration
processing method cannot be carried out. When using this processing
method, ensure to use a servomotor.
Velocity
Time
Fig. 12.46 S-pattern acceleration/deceleration processing method