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1. Ovefview
MELSEC-A
1.4.6
Overview ofacceleration/decelerationprocessing
Acceleration/deceleration processing for the positioning operation, manual pulse-generator operation,
home position return operation and JOG operation is performed using the user-specified method,
acceleration time and deceleration time.
(1)
Acceleration/deceleration
method
There are two types of acceleration and deceleration processing: the automatic trapezoid
accelerationldeceleration method and the S-curve accelerationldeceleration method. An
extended parameter is used to set which method is used.
The specified acceleratiorddeceleration method is applied to all accelerations and decelerations
when starting and completing the positioning operation, home position return operation and JOG
operation, as well as when changing the speed.
1)
Automatic trapezoid acceleration/deceleration
method
This method accelerates and decelerates in a linear fashion based on the speed limit value
and user-specified acceleration time/deceleration time.
Speed
b2)
DLstance
S-curve acceleration/deceleration
method
This method reduces the load on the motor when starting and stopping.
This method gradually accelerates or decelerates based on the user-specified acceleration
time and deceleration time, S-curve ratio (1 ?4. to 100 7.) and speed limit value.
Speed
----
~ O@tance
(2)
Acceleration
(a)
time, deceleration
time, rapid-stop deceleration
time
Four types each of the acceleration time and deceleration time for positioning control can be
set using basic parameter 2 and extended parameter 2.
Also, the acceleration time and deceleration time can be selected from 1 to 65535 ms or 1 to
8388608 ms using the acceleration/deceleration time setting size selection in extended
parameter 1.
(b)
●
Acceleration time ..... The time elapses before the speed of O reaches the limit value.
●
Deceleration time ---- The time elapses before the speed at the limit value reaches O.
The rapid-stop deceleration time (1 to 65535 ms or 1 to 8388608 ms) is set using the
acceleration/deceleration time setting size selection of extended parameter 1.
EiEl
The selection of 1 to 65535 ms or 1 to 8388608 ms for the acceleration time, deceleration time and
rapid-stop deceleration time is set for each axis.
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