Mitsubishi Electric MELSEC iQ-R Series User Manual page 238

Precautions during control
• If any axis exceeds "[Pr.8] Speed limit value" during 2- to 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 the reference axis exceeds "[Pr.8] Speed limit value" during 2-axis circular interpolation control, the reference axis is
controlled with the speed limit value. (The speed limit does not function on the interpolation axis side.)
• If any axis exceeds "[Pr.8] Speed limit value" during 2- to 4-axis linear interpolation control or 2- to 4-axis fixed-feed 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 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 "[Pr.8] Speed limit value". (However, when the movement amount of the linear
interpolation axis is more than the composite movement amount of the circular interpolation axis, such as when the number
of pitches ("[Da.10] M code/Condition data No./Number of LOOP to LEND repetitions/Number of pitches") set in the linear
interpolation axis is less, the speed of the linear interpolation axis cannot be suppressed with "[Pr.8] Speed limit value".)
When the "reference axis speed" is set during interpolation control, set so the major axis side becomes the
reference axis. If the minor axis side is set as the reference axis, the major axis side speed may exceed "[Pr.8]
Speed limit value".
Setting method
To use the "speed limit function", set the "speed limit value" in the parameters shown in the following table, and write them to
the Motion module.
The set details are validated at the next start after they are written to the Motion module.
Setting item
[Pr.8] Speed limit
value
[Pr.31] JOG speed limit
value
Refer to the following for the setting details.
Page 411 Basic Setting
8 CONTROL SUB FUNCTIONS
236
8.3 Functions to Limit the Control
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Setting Setting details
value

Set the speed limit value (max. speed during control).

Set the speed limit value during JOG operation (max. speed during control).
(Note that "[Pr.31] JOG speed limit value" shall be less than or equal to "[Pr.8]
Speed limit value".)
• Parameters are set for each axis.
• It is recommended that the parameters be set whenever possible with the engineering tool. Execution by a
program uses many programs and devices. The execution becomes complicated, and the scan times will
increase.
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Factory-set initial value
200000
20000