Справочник Пользователя для Mitsubishi Electronics FR-A720-0.4k to 90k

(1) Shortest acceleration/deceleration mode (Pr. 292 = "1, 11", Pr. 293)

⋅ Set when you want to accelerate/decelerate the motor for the shortest time. It is desired to make acceleration/

deceleration in a shorter time for a machine tool etc. but the design values of machine constants are unknown.

⋅ Acceleration/deceleration speed is automatically adjusted at a start of acceleration/deceleration so that

acceleration/deceleration is made with the maximum torque the inverter can output according to the setting value

of Pr. 7 Acceleration time and Pr. 8 Deceleration time. (The setting values of Pr. 7 and Pr. 8 are not changed)

⋅ Either acceleration or deceleration can be made in the shortest time using Pr. 293 Acceleration/deceleration separate

selection. 

When the setting value is "0" (initial value), both acceleration and deceleration can be made in the shortest time.

⋅ Since the 7.5K or lower inverter has a built-in brake resistor, set Pr. 292 to "11". Set "11" also when a high-duty

brake resistor or brake unit is connected. Deceleration time can be further shortened.

⋅ When the shortest acceleration/deceleration mode is selected under V/F control and Advanced magnetic flux

vector control, the stall prevention operation level during acceleration/deceleration becomes 150% (adjustable

using Pr. 61 to Pr. 63 ). The setting of Pr. 22 Stall prevention operation level and stall level by analog input are used

only during a constant speed operation.

Adjustment using Pr. 61 to Pr. 63 cannot be made under Real sensorless vector control or vector control since

torque limit level (Pr. 22 etc.) is used during acceleration/deceleration.

⋅ It is inappropriate to use for the following applications.

a)Machine with a large inertia such as a fan (more than 10 times). Since stall prevention operation will be

activated for a long time, this type of machine may trip due to motor overloading, etc. 

b)It is desired to always perform operation with a constant acceleration/deceleration time.

The inverter operates in the same conditions as when appropriate values are set in each parameter even if
acceleration/deceleration time and V/F pattern are not set. This function is useful when you just want to operate,
etc. without fine parameter setting.

9999

55K or 

lower

0 to 500A

Set the reference current during shortest/ optimum 

acceleration/deceleration.

75K or 

higher

0 to 3600A

9999

Rated inverter output current value is reference

9999

0 to 220%

Set the limit value/optimum value during shortest/

optimum acceleration.

9999

Shortest acceleration/deceleration: 150% is a limit value

Optimum acceleration/deceleration: 100% is an 

optimum value

9999

0 to 220%

Set the limit value/optimum value during shortest/

optimum deceleration.

9999

Shortest acceleration/deceleration: 150% is a limit value

Optimum acceleration/deceleration: 100% is an 

optimum value

0

0

Normal operation mode

1

Shortest acceleration/deceleration mode (without 

brake)

11

Shortest acceleration/deceleration mode (with brake)

3

Optimum acceleration/deceleration mode

5, 6

Elevator mode1, 2 (Refer to page 163) 

7, 8

Brake sequence mode 1, 2 (Refer to page 217.)

0

0

Both acceleration and deceleration are made in the 

shortest/optimum acceleration/deceleration mode

1

Only acceleration is made in the shortest/optimum 

acceleration/deceleration mode

2

Only deceleration is made in the shortest/optimum 

acceleration/deceleration mode

⋅ Even if automatic acceleration/deceleration mode has been selected, inputting the JOG signal (Jog operation), RT signal

(second function selection) or X9 signal (third function selection) during an inverter stop will switch to the normal operation and

give priority to jog operation, second function selection or third function selection. Note that JOG and RT signal input is invalid

even if JOG signal and RT signal are input during operation in automatic acceleration/deceleration mode.

⋅ Since acceleration/deceleration is made with the stall prevention operation being activated, the acceleration/deceleration speed

always varies according to the load conditions.

⋅ Note that when proper values are set in Pr. 7 and Pr. 8 , acceleration/deceleration time may be shorter than selecting shortest

acceleration/deceleration mode.