9 MAJOR POSITIONING CONTROL

MELSEC-Q

[When the speed cannot change over in P2]

When the relation of the speeds is P1 = P4, P2 = P3, P1 < P2.

P1

P2

P3

 

P4

 

 

 

 

 

 

 

 

 

 

 

 

[When the movement amount is small during automatic deceleration]

The movement amount required to carry out the automatic deceleration cannot be secured, so the

machine immediately stops in a speed 0 status.

Positioning address.

(b)Front-loading speed switching mode

1)If the respective command speeds differ in the "positioning data currently being executed" and the "positioning data to carry out the next operation", the speed will change over to the speed set in the "positioning data to carry out the next operation" at the end of the "positioning data currently being executed".

2)The parameters used in acceleration/deceleration to the command speed set in the "positioning data to carry out the next operation" are those of the positioning data to carry out acceleration/deceleration.

Speed switching will not be carried out if the command speeds are the same.

 

 

V

 

 

 

Dwell time

Dwell time

 

 

 

 

 

 

 

Positioning

 

 

 

 

 

t

 

Da. 1 Operation pattern

11

11

11

01

00

 

 

 

ON

 

 

 

 

Positioning start signal

OFF

 

 

 

 

 

 

[Y10, Y11, Y12, Y13]

 

 

 

 

 

Start complete signal

 

ON

 

 

 

 

 

 

 

 

 

 

 

[X10, X11, X12, X13] OFF

 

 

 

 

 

 

 

 

ON

 

 

 

 

BUSY signal

[XC, XD, XE, XF] OFF

 

 

 

 

 

 

 

 

 

ON

 

 

 

Positioning complete signal

OFF

 

 

 

 

 

 

[X14, X15, X16, X17]

 

 

 

 

 

 

Fig. 9.5 Operation for the front-loading speed switching mode

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Image 313
Mitsubishi Electronics QD75D, QD75P user manual Start complete signal X10, X11, X12, X13 OFF Busy signal, X14, X15, X16