Mitsubishi Electronics QD75P Outline of sub functions, It cannot be invalidated with parameters

12CONTROL SUB FUNCTIONS

12.1 Outline of sub functions

MELSEC-Q

"Sub functions" are functions that compensate, limit, add functions, etc., to the control when the main functions are executed. These sub functions are executed by parameter settings, commands from GX Configurator-QP, sub function sequence programs, etc.

12.1.1 Outline of sub functions

The following table shows the types of sub functions available.

Sub function

Details

This function retries the machine OPR with the upper/lower limit switches

Functions

OPR retry function

during machine OPR. This allows machine OPR to be carried out even if the

characteristic

axis is not returned to before the near-point dog with JOG operation, etc.

to machine

After returning to the machine OP, this function offsets the position by the

OPR

OP shift function

designated distance from the machine OP position and sets that position as

the OP address.

Backlash compensation

This function compensates the mechanical backlash. Feed pulses equivalent

to the set backlash amount are output each time the movement direction

function

changes.

Functions that

By setting the movement amount per pulse, this function can freely change

compensate

Electronic gear function

the machine movement amount per commanded pulse.

control

When the movement amount per pulse is set, a flexible positioning system

that matches the machine system can be structured.

Near pass function

1

This function suppresses the machine vibration when the speed changes

during continuous path control in the interpolation control.

If the command speed exceeds "

Speed limit value" during control,

Pr.8

Speed limit function

this function limits the commanded speed to within the "

Speed limit

Pr.8

value" setting range.

If the torque generated by the servomotor exceeds "

Torque limit

Pr.17

Functions that

Torque limit function

2

setting value" during control, this function limits the generated torque to

limit control

within the "

Torque limit setting value" setting range.

Pr.17

Software stroke limit

If a command outside of the upper/lower limit stroke limit setting range, set in

the parameters, is issued, this function will not execute positioning for that

function

command.

Hardware stroke limit

This function carries out deceleration stop with the limit switch connected to

function

the QD75 external device connector.

This function changes the speed during positioning.

Set the changed speed in the speed change buffer memory (

New

Speed change function

Cd.14

speed value), and change the speed with the speed change request

(

Speed change request).

Functions that

Cd.15

This function changes the speed within a percentage of 1 to 300% during

change control

details

positioning. This is executed using "

Positioning operation speed

Override function

Cd.13

override".

Acceleration/deceleration

This function changes the acceleration/deceleration time during speed

time change function

change.

Torque change function

This function changes the "torque limit value" during control.

1 The near pass function is validated only when the machine of the standard specification carries out the position control with the continuous path control mode.

It cannot be invalidated with parameters.

2 To carry out "torque limit", the "D/A conversion module" and a "drive unit capable of the torque limit command with an analog voltage" must be prepared.

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