12CONTROL SUB FUNCTIONS

12.4 Functions to limit the control

MELSEC-Q

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

OPR

Machine OPR control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

control

Fast OPR control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1-axis linear control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2 to 4-axes linear

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Position

interpolation control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1-axis fixed-feed control

 

 

 

 

 

 

Speed limit

 

 

 

 

 

 

 

 

control

2 to 4-axes fixed-feed

 

 

 

 

Pr.8

 

 

 

 

 

 

 

 

 

value

 

 

 

 

 

 

 

 

 

 

 

control (interpolation)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Major

 

2-axis circular interpolation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

positioning

 

control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

control

1 to 4-axes Speed control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Speed-position switching control,

 

 

 

 

 

 

 

 

 

Position-speed switching control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Current value changing

 

 

 

 

 

 

Other

JUMP instruction, NOP

 

 

 

Setting value invalid

 

control

instruction, LOOP to

 

 

 

 

 

 

 

 

LEND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

JOG speed

Manual

JOG operation, Inching operation

 

 

 

 

Pr.31

 

 

 

 

 

 

 

 

limit value

 

 

 

 

 

 

 

control

 

 

 

 

 

 

 

 

 

Manual pulse generator operation

 

 

 

Setting is invalid

 

 

 

 

 

 

 

 

: Always set

: 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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Mitsubishi Electronics QD75D, QD75P user manual Functions to limit the control, Speed limit function