Setting of acceleration/deceleration time and acceleration/ deceleration pattern
Acceleration/deceleration pattern (Pr. 29)
You can set the acceleration/deceleration pattern suitable for application.
The above parameters can be set when Pr. 160 Extended function display selection ="0". (Refer to page 197)
Setting value "0"
Setting value "1"
For the acceleration/deceleration time of the S-pattern acceleration/deceleration A, set the time to reach Pr.3 Base
frequency (rated IPM motor frequency under IPM motor control (Refer to page 86)) but not the time to reach Pr.20
Acceleration/deceleration reference frequency.
Setting value "2"
Parameters referred to
Pr. 3 Base frequency
Pr. 7 Acceleration time, Pr. 8 Deceleration time, Pr. 20 Acceleration/deceleration reference frequency
Linear acceleration/deceleration (Pr. 29 setting "0", initial value)
For the inverter operation, the output frequency is made to change linearly (linear
acceleration/deceleration) to prevent the motor and inverter from getting
excessive stress to reach the set frequency during acceleration, deceleration, etc.
when frequency changes. Linear acceleration/deceleration has a uniform
S-pattern acceleration/deceleration A (Pr. 29 = "1")
For machine tool spindle applications, etc.
Use this pattern when acceleration/deceleration is required in a short time to a
high-speed range higher than the base frequency.
In this acceleration/deceleration pattern, Pr. 3 Base frequency (fb) is the inflection
point of the S pattern, and you can set the acceleration/deceleration time
appropriate for motor torque reduction in a constant-power operation range of
base frequency (fb) or higher.
Rated motor frequency under IPM motor control (Refer to page 86)
S-pattern acceleration/deceleration B (Pr. 29 = "2")
For prevention of load shifting in conveyor and other applications.
Since acceleration/deceleration is always made in an S shape from current
frequency (f2) to target frequency (f1), this function eases shock produced at
acceleration/deceleration and is effective for load collapse prevention, etc.
Refer to page 103
Linear acceleration/ deceleration
S-pattern acceleration/deceleration A
S-pattern acceleration/deceleration B
Refer to page 113