12 - 25
MELSEC-A
12 CONTROL AUXILIARY FUNCTIONS
12.4 Functions to limit the control
Functions to limit the control include the "speed limit function", "torque limit function",
"software stroke limit", and "hardware stroke limit". Each function is executed by
parameter setting or sequence program creation and writing.
12.4.1 Speed limit function
The speed limit function limits the command speed to a value within the "speed limit
value" setting range when the command speed during control exceeds the "speed limit
value".
The details shown below explain about the "speed limit function".
(1) Relation between the speed limit function and various controls
(2) Precautions during control
(3) Setting the speed limit function
(1) Relation between the speed limit function and various controls
The following table shows the relation of the "speed limit function" and various
controls.
Control type
Speed limit function Speed limit value
Machine zero point return control
Zero point
return
control
High-speed zero pint return control
1-axis linear control
2-axis linear interpolation
control
1-axis fixed-dimension
feed control
2-axis fixed-dimension
feed control (interpolation)
Position
control
2-axis circular interpolation
control
Speed control
Speed/position changeover control
Pr.7 Speed limit
value
Current value change
–
Main
positioning
control
Other
control JUMP command
–
Setting value invalid
JOG operation
Pr.32 JOG speed
limit value
Manual
control
Manual pulse generator operation
Setting not possible.
: Always set
: Setting not possible
– : Setting not required (Setting value is invalid. Use the initial values or setting values
within a range where no error occurs.)
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Страница 673: ...Appendix 5 MELSEC A APPENDICES Axis address mm inch degree pulse Axis address mm inch degree pulse...
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