Mitsubishi Electronics FR-F740P ユーザーズマニュアル

⋅ On the assumption that Pr. 19 Base frequency voltage is 100%, set the output voltage at 0Hz in % in Pr. 0 (Pr. 46).
⋅ Adjust the parameter little by little (about 0.5%), and check the motor status each time. If the setting is too large,

the motor will overheat. The guideline is about 10% at the greatest.

(2) Set multiple torque boost (RT signal, Pr. 46)

⋅ Use the second torque boost when changing the torque boost according to application or when using multiple

motors by switching between them by one inverter.

⋅  Pr. 46 Second torque boost is valid when the RT signal turns ON.

You can compensate for a voltage drop in the low-frequency range to improve motor torque reduction in the low-

speed range.

Motor torque in the low-frequency range can be adjusted to the load to increase the starting motor torque.

The starting torque boost can be changed by switching terminals.

0.75K

6%

0 to 30%

Set the output voltage at 0Hz as %.

1.5K to 3.7K

4%

5.5K, 7.5K

3%

11K to 37K

2%

45K, 55K

1.5%

75K or higher

1%

9999

0 to 30%

Set the torque boost value when the 
RT signal is on.

9999

Without second torque boost

*1

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

⋅ The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 136)

⋅ The RT signal is assigned to the RT terminal in the default setting. By setting "3" to any of Pr. 178 to Pr. 189 (Input terminal function

selection), you can assign the RT signal to the other terminal.

V/F

V/F

V/F

Output 
voltage

Setting 
range

Base 
frequency

0

100%

Output 
frequency
(Hz)