12 CONTROL SUB FUNCTIONS

MELSEC-Q

(4)When the speed is changed by setting " the operation is carried out as follows.

Cd.14

New speed value" to "0",

A deceleration stop is carried out, and the speed change 0 flag

(

Md.31

Status: b10) turns ON.

(During interpolation control, the speed change 0 flag on the reference axis

side turns ON.)

The axis stops, but "

Md.26

Axis operation status" does not change, and

the BUSY signal remains ON. (If a stop signal is input, the BUSY signal will turn OFF, and " Md.26 Axis operation status" will change to

"stopped".)

In this case, setting the " Cd.14 New speed value" to a value besides "0"

will turn OFF the speed change 0 flag ( continued operation.

Md.31

Status: b10), and enable

Positioning start signal

ON

 

[Y10, Y11, Y12, Y13] OFF

 

 

 

ON

 

BUSY signal [XC,XD,XE,XF] OFF

 

 

Cd. 14 New speed value

0

1000

 

 

ON

Cd. 15 Speed change request

OFF

 

Positioning operation

 

 

 

 

ON

Speed change 0 flag

OFF

 

Md. 31 status: b10

 

 

Fig. 12.25 Speed change at new speed value "0"

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

During deceleration by a stop command

During automatic deceleration during positioning control

(6)A warning "Speed limit value over (warning code: 501)" occurs and the

speed is controlled at the "

Pr.8

Speed limit value" when the value set in

"

Cd.14

New speed value" is equal to or larger than the "

Pr.8

Speed limit

value".

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

(8)When carrying out consecutive speed changes, be sure there is an interval between the speed changes of 100ms or more.

(If the interval between speed changes is short, the QD75 will not be able to track, and it may become impossible to carry out commands correctly.)

(9)When a speed change is requested simultaneously for multiple axes, change the speed in the ascending axis number order.

(10)Speed change cannot be carried out during the machine OPR. A request for speed change is ignored.

(11)When deceleration is started by the speed change function, the deceleration start flag does not turn ON.

12 - 36

Page 512
Image 512
Mitsubishi Electronics QD75P, QD75D user manual Status b10, and enable, Speed limit value when the value set, Md status b10