12CONTROL SUB FUNCTIONS

[2]Precaution during control

MELSEC-Q

(1)When changing the speed during continuous path control, the speed change will be ignored if there is not enough distance remaining to carry out the change.

(2)A warning "Deceleration/stop speed change (warning code: 500)" occurs and the speed cannot be changed in the following cases.

(The value set in " Cd.13 Positioning operation speed override" is validated after a deceleration stop.)

During deceleration by a stop command

During automatic deceleration during positioning control

(3)When the speed is changed during interpolation control, the required speed is set in the reference axis.

(4)When deceleration is started by the override function, the deceleration start flag does not turn ON.

[3]Setting the override function

The following shows the data settings and sequence program example for setting the override value of axis 1 to "200%".

(1)Set the following data. (Use the start time chart shown in section (2) below as a reference, and set using the sequence program shown in section (3).)

 

 

 

 

Setting

 

Buffer memory address

 

 

Setting item

Setting details

Axis

Axis

Axis

Axis

 

 

value

 

 

 

 

 

1

2

3

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Positioning

 

 

 

 

 

 

 

Cd.13

 

operation speed

200

Set the new speed as a percentage (%).

1513

1613

1713

1813

 

 

 

override

 

 

 

 

 

 

Refer to Section 5.7 "List of control data" for details on the setting details.

(2)The following shows a time chart for changing the speed using the override function.

V

Dwell time

t

Positioning start signal

[Y10]

 

PLC READY signal

[Y0]

 

QD75 READY signal

[X0]

 

Start complete signal

[X10]

 

BUSY signal

[XC]

 

Positioning complete signal

[X14]

 

Error detection signal

[X8]

 

Cd. 13 Positioning operation

200

 

speed override

 

Fig. 12.29 Time chart for changing the speed using the override function

12 - 42

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Image 518
Mitsubishi Electronics QD75P, QD75D user manual Setting the override function, Positioning Cd.13 Operation speed