12 - 44
MELSEC-Q
12 CONTROL SUB FUNCTIONS
12.5.3 Acceleration/deceleration time change function
The "acceleration/deceleration time change f unction" is used to change the
acceleration/deceleration time during a speed change to a random value when
carrying out the speed change indicated in Sec tion 12.5.1 "Speed change function".
In a normal speed change (when the accelerat ion/deceleration time is not changed),
the acceleration/deceleration time previousl y set in the parameters ( Pr.9 ,Pr.10 ,
and Pr.25 to Pr.30 values) is set in the positioning parameter data item s Da.3
and Da.4 , and control is carried out with that acceleration/deceleration time.
However, by setting the new acceleration/decelera tion time ( Cd.10 ,Cd.11 ) in the
control data, and issuing an acceleration/dec eleration time change enable command
(Cd.12 Acceleration/deceleration time change dur ing speed change, enable/disable
selection) to change the speed when the acceler ation/deceleration time change is
enabled, the speed will be changed with the new acceleration/dece leration time
(Cd.10 ,Cd.11 ).
The details shown below explain about the "acce leration/deceleration time change
function".
[1] Control details
[2] Precautions during control
[3] Setting the acceleration/deceleration tim e change function
[1] Control details
The following drawing shows the operation dur ing 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
Cd.15 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.12 Acceleration/deceleration
time change during
speed change, enable/
disable selection
Cd.15 Speed
change request
Disabled Enabled
t
VOperation with the acceleration/deceleration
time ( Cd. 10 and Cd. 11 ) set in the buffer memory.
Fig. 12.30 Operation during an acceleration/dec eleration time change