Справочник Пользователя для Mitsubishi Electronics FR-F740P

The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 201)

⋅ Effective for eliminating noise in the frequency setting circuit.
⋅ Increase the filter time constant if steady operation cannot be performed due to noise. A larger setting results in

slower response. (The time constant can be set between approximately 5ms to 1s with the setting of 0 to 8.)

⋅ Use the override function to change the main speed at a fixed ratio.
⋅ Set any of "4, 5, 14, 15" in Pr. 73 to select an override.
⋅ When an override is selected, the terminal 1 or terminal 4 is used for the main

speed setting and the terminal 2 for the override signal. (When the main speed of
the terminal 1 or terminal 4 is not input, compensation made by the terminal 2
becomes invalid.)

⋅ Using Pr. 252 and Pr. 253, set the override range.
⋅ How to find the set frequency for override

Set frequency (Hz) = Main speed set frequency (Hz) 

× 

Main speed set frequency (Hz): Terminal 1, 4 input, multi-speed setting
Compensation amount (%): Terminal 2 input

Example)When Pr. 73 = "5"

The set frequency changes as shown below according to the
terminal 1 (main speed) and terminal 2 (auxiliary) inputs.

⋅ When the Pr. 73 setting was changed, check the voltage/current input switch setting. Different setting may cause a fault, failure

or malfunction. (Refer to page 185 for setting.)

⋅ The AU signal must be turned ON to use the terminal 4.
⋅ When inputting compensation to multi-speed operation or remote setting, set "1" (compensation made) to Pr. 28 Multi-speed input

compensation selection. (Initial value is "0")

♦ Parameters referred to ♦

The time constant of the primary delay filter relative to external frequency command (analog input (terminal 1, 2,
4) signal) can be set.

1

 0 to 8

Set the primary delay filter time 
constant for the analog input. A larger 
setting results in slower response.

10

2

5

Forward 
rotation

Main 
speed

Inverter

STF

1

(-)

(+)

Override 
setting

SD

Compensation amount (%)

100(%)

0V

2.5V
(5V)

5V
(10V)

0

50

100

150

200

Initial value

(50% to 150%)

Voltage across terminals 2-5

Override value (%)

0

2.5

5

0

Terminal 1 input voltage (V)

Set frequency (Hz)

Terminal 2 5VDC 
input(150%)

Terminal 2 0V 
input(50%)

Terminal 2 2.5VDC 
input(100%)

30

15

60

45

90