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MELSEC-Q
12 CONTROL SUB FUNCTIONS
[2] Precautions during control
If any axis exceeds "
Pr.8
Speed limit value" during 2- to 4-axis speed control,
the axis in excess of the speed limit value is controlled at the speed limit value.
The speeds of the other axes interpolated are suppressed depending on their
command speed ratios.
If the reference axis exceeds "
Pr.8
Speed limit value" during 2- to 4-axis linear
interpolation control, 2- to 4-axis fixed-feed control or 2-axis circular interpolation
control, the reference axis is controlled at the speed limit value (The speed limit
does not function on the interpolation axis side.)
[3] Setting the speed limit function
To use the "speed limit function", set the "speed limit value" in the parameters
shown in the following table, and write them to the QD75.
The set details are validated after they are written to the QD75.
Setting item
Setting
value
Setting details
Factory-set
initial value
Pr.8
Speed limit value Set the speed limit value (max. speed during control). 200000
Pr.31
JOG speed limit
value
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".)
20000
Refer to Section 5.2 "List of parameters" for setting details.
REMARK
•
Parameters are set for each axis.
•
It is recommended that the parameters be set whenever possible with GX
Configurator-QP. Execution by sequence program uses many sequence programs
and devices. The execution becomes complicated, and the scan times will
increase.