12 CONTROL SUB FUNCTIONS

12.5.3 Acceleration/deceleration time change function

MELSEC-Q

The "acceleration/deceleration time change function" is used to change the acceleration/deceleration time during a speed change to a random value when carrying out the speed change indicated in Section 12.5.1 "Speed change function". In a normal speed change (when the acceleration/deceleration time is not changed),

the acceleration/deceleration time previously set in the parameters (

Pr.9

,

Pr.10

,

and

Pr.25

to

Pr.30

values) is set in the positioning parameter data items Da.3

and Da.4 , and control is carried out with that acceleration/deceleration time.

However, by setting the new acceleration/deceleration time (

Cd.10

,

Cd.11

) in the

control data, and issuing an acceleration/deceleration time change enable command

( Cd.12

Acceleration/deceleration time change during speed change, enable/disable

selection) to change the speed when the acceleration/deceleration time change is enabled, the speed will be changed with the new acceleration/deceleration time

(

Cd.10

,

Cd.11

).

The details shown below explain about the "acceleration/deceleration time change function".

[1]Control details

[2]Precautions during control

[3]Setting the acceleration/deceleration time change function

[1]Control details

The following drawing shows the operation during an acceleration/deceleration time change.

[For an acceleration/deceleration time change disable setting]

Cd.12 Acceleration/deceleration time change during speed change, enable/ disable selection

V

Operation with the acceleration/deceleration

time set in and .

Cd.15 Speed change request

t

Disabled

[For an acceleration/deceleration time change enable setting]

Cd.12 Acceleration/deceleration time change during speed change, enable/ disable selection

V

Operation with the acceleration/deceleration

time ( Cd. 10 and ) set in the buffer memory.

Cd.15 Speed change request

t

Disabled Enabled

Fig. 12.30 Operation during an acceleration/deceleration time change

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Image 520
Mitsubishi Electronics QD75P Acceleration/deceleration time change function, Pr.9 Pr.10 Pr.25 Pr.30, Cd.10 Cd.11, Cd.12