Справочник Пользователя для Mitsubishi Electronics FR-D720-008

The above parameters can be set when Pr. 160 Extended function display selection ="0". (Refer to page 162)

You can set the acceleration/deceleration pattern suitable for application.

0

0

Linear acceleration/ deceleration

1

S-pattern acceleration/deceleration A

2

S-pattern acceleration/deceleration B

(1) 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
frequency/time slope.

(2) 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.

NOTE

As the acceleration/deceleration time of S-pattern acceleration/deceleration A, set the time taken until Pr. 3 Base
frequency  is reached, not Pr. 20 Acceleration/deceleration reference frequency.

(3) 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.

Parameters referred to

(Hz)

Time

Setting value "0"

[Linear acceleration/

deceleration]

Output frequency

fb

(Hz)

Setting value "1"

[S-pattern acceleration/

deceleration A]

Output frequency

Time

f1

(Hz)

(Hz)

f2

Set frequency

Output frequency

Time

Setting value "2"

[S-pattern acceleration/

deceleration B]