Mitsubishi A1SD75M1, User Manual

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12 - 53
MELSEC-A
12 CONTROL AUXILIARY FUNCTIONS
12.5.3 Acceleration/deceleration time change function
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.8 , Pr.9 ,
and Pr.26 to Pr.31 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.33 , Cd.34 ) in the
control data, and issuing an acceleration/deceleration time change enable command
( Cd.35 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.33 , Cd.34 ).
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.35 Acceleration/deceleration
time change during
speed change, enable/
disable selection
Cd.17 Speed
change request
t
V
Operation with the acceleration/deceleration
time set in Da. 3 and Da. 4 .
Disabled
(For an acceleration/deceleration time change enable setting)
Cd.35 Acceleration/deceleration
time change during
speed change, enable/
disable selection
Cd.17 Speed
change request
Disabled Enabled
t
V
Operation with the acceleration/deceleration
time ( Cd. 33 and Cd. 34 ) set in the buffer memory.
Fig. 12.29 Operation during an acceleration/deceleration time change