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7 CONTROL SUB FUNCTIONS
7.4 Function to Limit Control
7.4
Function to Limit Control
Functions to limit the control include Speed limit function, Torque limit function, Software stroke limit function, and Hardware
stroke limit function. Each function is executed by setting parameters or creating and writing a program.
Speed limit function
Speed limit function limits the command speed to a value within the setting range of Speed limit value when the command
speed during the control exceeds Speed limit value.
When the command speed exceeds the value set in [Pr.8] Speed limit value, [Md.39] In speed limit flag turns on and Speed
limit value over (Warning code: 0991H) occurs.
Relation between the speed limit function and various controls
The following table shows the relation between Speed limit function and various controls.
: Always set
: Setting not required (The set value is ignored. Set the value within the setting range, such as the initial value.)
Control precautions
• If any axis exceeds the value in [Pr.8] Speed limit value during either of the 2-axis speed control, 3-axis speed control, and
4-axis speed control, the axis exceeding the speed limit value is controlled with the speed limit value. The speeds of the
other axes being interpolated are suppressed by the command speed ratio.
• If any axis exceeds the value in [Pr.8] Speed limit value during any of the 2-axis linear interpolation control, 3-axis linear
interpolation control, 4-axis linear interpolation control, 2-axis fixed-feed control, 3-axis fixed-feed control, 4-axis fixed-feed
control, 2-axis circular interpolation control, and 3-axis helical interpolation control, the axis exceeding the speed limit value
is controlled with the speed limit value. The speeds of the other axes being interpolated are suppressed by the movement
amount ratio.
• In the 2-axis linear interpolation control, 3-axis linear interpolation control, 4-axis linear interpolation control, 2-axis fixed-
feed control, 3-axis fixed-feed control, or 4-axis fixed-feed control, when 1: Reference axis speed is set in [Pr.20]
Interpolation speed specification method, and when the reference axis is the minor axis and the interpolation axis is the
major axis, the speed limit value of the interpolation axis may not function.
• In the 3-axis helical interpolation control, the composite speed of the circular interpolation axis or the speed of the linear
interpolation axis is controlled not to exceed the value in [Pr.8] Speed limit value.
Control type
Speed limit function Speed limit value
OPR control
Machine OPR control
[Pr.8] Speed limit value
Fast OPR control
Major positioning control
Position control
1-axis linear control
2-/3-/4-axis linear
interpolation control
1-axis fixed-feed control
2-/3-/4-axis fixed-feed
control
2-axis circular
interpolation control
3-axis helical
interpolation control
1-/2-/3-/4-axis speed control
Speed-position switching control, Position-speed
switching control
Other controls
Current value change
Setting value is invalid
JUMP instruction, NOP
instruction, LOOP to
LEND
Manual control
JOG operation, Inching operation
[Pr.31] JOG speed limit value
Manual pulse generator operation
Setting value is invalid
Summary of Contents for MELSEC iQ-R RD75P4
Page 1: ...MELSEC iQ R Positioning Module User s Manual Application RD75P2 RD75P4 RD75D2 RD75D4 ...
Page 2: ......
Page 13: ...11 MEMO ...
Page 19: ...17 CONTENTS INDEX 588 REVISIONS 592 WARRANTY 593 TRADEMARKS 594 ...
Page 498: ...496 13 PROGRAMMING 13 2 List of Labels Used ...
Page 503: ...13 PROGRAMMING 13 4 Program Example 501 13 ...
Page 514: ...512 13 PROGRAMMING 13 4 Program Example Restart program Parameter data initialization program ...
Page 515: ...13 PROGRAMMING 13 4 Program Example 513 13 Flash ROM write program Error reset program ...
Page 516: ...514 13 PROGRAMMING 13 4 Program Example Stop program ...
Page 565: ...APPENDICES Appendix 4 Operation Examples of When the Remote Head Module Is Mounted 563 A ...
Page 597: ......