Mitsubishi Electric MELSEC iQ-F Series FX5 User Manual page 292

■S-curve acceleration/deceleration processing method
In this method, the motor burden at the start and stop is reduced.
The acceleration/deceleration is reduced gradually, based on the acceleration time, deceleration time, speed limit value, and
the value set in [Pr.35] S-curve ratio (1 to 100%) set by users.
Speed
When an event that generates a speed change request occurs during the S-curve acceleration/deceleration processing (when
a speed change request is given or Stop signal is turned on), the S-curve acceleration/deceleration processing begins at that
point.
No speed change request
Set the required values for Acceleration/deceleration method setting in the parameter areas shown in the following table, and
write them to the positioning module. The set data is validated when the data is written into the positioning module.
Setting item
[Pr.34] Acceleration/
deceleration processing
selection
[Pr.35] S-curve ratio
For details on the settings, refer to the following.
Page 393 [Pr.34] Acceleration/deceleration processing selection
Page 394 [Pr.35] S-curve ratio
Precautions
When a stepping motor is used, the acceleration increases around the inflection point in the S-shaped curved line compared
with the trapezoidal acceleration/deceleration. This may cause step out. (When the trapezoidal acceleration/deceleration and
S-curve acceleration/deceleration having the same acceleration/deceleration time are compared.)
In this case, adjust the acceleration/deceleration time so that the acceleration decreases around the inflection point, or use a
servomotor.
• Parameters are set for each axis.
• Setting the parameters using GX Works3 is recommended. To perform the setting using programs, many
programs and devices are required. The execution becomes complicated, and the scan times will increase.
12 CONTROL SUB FUNCTION
290
12.9 Other Functions
Time
Acceleration speed change
Command speed before speed
change
Speed change request
Deceleration speed change
Setting Setting detail
value
→
Set the acceleration/deceleration method.
• 0: Trapezoidal acceleration/deceleration
processing
• 1: S-curve acceleration/deceleration
processing
→
Set the acceleration/deceleration curve when 1
is set in [Pr.34] Acceleration/deceleration
processing selection.
Initial value Buffer memory address
at the
Axis 1
factory
0 52
100 53
Axis 2
202
203