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7 CONTROL SUB FUNCTIONS
7.9 Other Functions
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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.
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.
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.
Set the required values for Acceleration/deceleration method setting in the parameter areas shown in the following table, and
write them to the RD75. The set data is validated when the data is written into the RD75.
For details on the settings, refer to the following.
Page 402 [Pr.34] Acceleration/deceleration processing selection
Page 403 [Pr.35] S-curve ratio
• Parameters are set for each axis.
• Setting the parameters using an engineering tool is recommended. To perform the setting using programs,
many programs and devices are required. The execution becomes complicated, and the scan times will
increase.
Setting item
Setting
value
Setting detail
Initial value at the
factory
[Pr.34]
Acceleration/deceleration
processing selection
Set the acceleration/deceleration method.
0: Trapezoidal acceleration/deceleration processing
1: S-curve acceleration/deceleration processing
0
[Pr.35]
S-curve ratio
Set the acceleration/deceleration curve when 1 is set in [Pr.34]
Acceleration/deceleration processing selection.
100
Speed
Time
When speed change
is not requested
Speed change (acceleration)
Command speed before speed change
Speed change request
Speed change (deceleration)
Содержание MELSEC iQ-R RD75P4
Страница 1: ...MELSEC iQ R Positioning Module User s Manual Application RD75P2 RD75P4 RD75D2 RD75D4 ...
Страница 2: ......
Страница 13: ...11 MEMO ...
Страница 19: ...17 CONTENTS INDEX 588 REVISIONS 592 WARRANTY 593 TRADEMARKS 594 ...
Страница 498: ...496 13 PROGRAMMING 13 2 List of Labels Used ...
Страница 503: ...13 PROGRAMMING 13 4 Program Example 501 13 ...
Страница 511: ...13 PROGRAMMING 13 4 Program Example 509 13 Torque change program Step operation program Skip program ...
Страница 512: ...510 13 PROGRAMMING 13 4 Program Example Teaching program Continuous operation interrupt program ...
Страница 513: ...13 PROGRAMMING 13 4 Program Example 511 13 Target position change program Absolute position restoration program ...
Страница 514: ...512 13 PROGRAMMING 13 4 Program Example Restart program Parameter data initialization program ...
Страница 515: ...13 PROGRAMMING 13 4 Program Example 513 13 Flash ROM write program Error reset program ...
Страница 516: ...514 13 PROGRAMMING 13 4 Program Example Stop program ...
Страница 565: ...APPENDICES Appendix 4 Operation Examples of When the Remote Head Module Is Mounted 563 A ...
Страница 568: ...566 APPENDICES Appendix 4 Operation Examples of When the Remote Head Module Is Mounted Common program ...
Страница 584: ...582 APPENDICES Appendix 4 Operation Examples of When the Remote Head Module Is Mounted Restart program ...
Страница 587: ...APPENDICES Appendix 4 Operation Examples of When the Remote Head Module Is Mounted 585 A Stop program ...
Страница 597: ......