100
3 BASIC FUNCTION
3.14 Acceleration/deceleration function
3.14
Acceleration/deceleration function
The acceleration/deceleration function enables smooth acceleration/deceleration. The following methods are available for the
acceleration/deceleration function.
Acceleration/deceleration time constant
The acceleration/deceleration time constant is the period of time taken to reach the rated speed from 0 r/min (0 mm/s) or to
reach 0 r/min (0 mm/s) from the rated speed for the commands or limits. The control mode influences whether the
acceleration/deceleration time constant is set in the servo parameters, objects, or other settable areas.
[Setting example]
For a servo motor with a rated speed of 3000 r/min, set 3 s to accelerate from 0 r/min to 1000 r/min in 1 s.
Precautions
• Refer to the different servo parameters, objects, and other settable areas in each control mode.
Setting method
The setting method varies for each control mode. Refer to the following table. In addition, the deceleration time constant of the
forced stop deceleration function can be set with [Pr. PC24 Deceleration time constant at forced stop]. Refer to the following.
Page 91 Forced stop deceleration function
*1 Available on servo amplifiers with firmware version B2 or later.
Item
Explanation
Reference
Acceleration/deceleration
time constant method
This is a method for performing acceleration/deceleration in accordance with the specified
acceleration/deceleration time constants [ms].
Set [Pr. PT01.1 Speed/acceleration/deceleration unit selection] to "0" to enable this method.
acceleration/deceleration time
constant
Acceleration/deceleration
method
This is a method for performing acceleration/deceleration in accordance with the specified
acceleration/deceleration [command unit/s
2
].
Using this method together with S-pattern acceleration/deceleration time constant enables
smoother acceleration/deceleration.
Set [Pr. PT01.1 Speed/acceleration/deceleration unit selection] to "1" to enable this method.
acceleration/deceleration time
constant
Control mode
Symbol
Description
Cyclic synchronous position mode
csp
Determined by the commands from the controller.
Set according to the manual of the controller to be used.
Cyclic synchronous velocity mode
csv
Cyclic synchronous torque mode
cst
pp
Can be set with [Profile acceleration (Obj. 6080h)] and [Profile deceleration (Obj. 6084h)].
Can also be set with [Pr. PT49 Speed acceleration time constant] and [Pr. PT50 Speed
deceleration time constant].
Profile velocity mode
pv
Can be set with [Profile acceleration (Obj. 6080h)] and [Profile deceleration (Obj. 6084h)].
Can also be set with [Pr. PT49 Speed acceleration time constant] and [Pr. PT50 Speed
deceleration time constant].
Profile torque mode
tq
The amount of torque change can be set with [Torque slope (Obj. 6087h)].
Homing mode
hm
This mode can be set with [Homing acceleration (Obj. 609Ah)]. Refer to the following.
0 r/min
(0 mm/s)
Servo motor speed
If the preset command speed is lower than the rated speed,
the acceleration/deceleration time will be shorter.
Rated speed
Time
Setting value of
acceleration time constant
Setting value of
deceleration time constant
Содержание MELSERVO-JET MR-JET-G-N1 Series
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