Mitsumi electronic FR-F520-0.75K, 55K Parameter Function Details, Torque boost Pr , Pr, Setting

4.2 Parameter Function Details

PARAMETERS

4.2.1 Torque boost (Pr. 0, Pr. 46)

Pr. 0 "torque boost"

Pr. 46 "second torque boost"

Related parameters

Pr. 3 "base frequency"

Pr. 19 "base frequency voltage" Pr. 71 "applied motor"

Pr. 180 to Pr. 186

(input terminal function selection)

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.

#You can select any of the starting torque boosts by terminal switching.

	Parameter	Factory	Setting Range	Remarks
	Number	Setting
	0.75K	6%
0	1.5K to 3.7K	4%	0 to 30%	
	5.5K, 7.5K	3%
	11K or more	2%
	46	9999	0 to 30%, 9999	9999: Function invalid

	100%
	Output voltage
Pr.0	Setting
Pr.46	range

0 Output	Base frequency
frequency (Hz)

<Setting>

#Assuming that the base frequency voltage is 100%, set the 0Hz voltage in %.

#A large setting will cause the motor to overheat. The guideline for maximum value is about 10%.

#Pr. 46 "second torque boost" is valid when the RT signal is on. (Note 3)

Note: 1. When the Pr. 0 setting is either of the following values for 5.5K and 7.5K, it is automatically changed when the Pr.71 setting is changed:

(1) When Pr. 0 setting is 3% (factory setting)

The Pr. 0 setting is changed to 2% automatically when the Pr. 71 setting is changed from [general-purpose motor selection value (0, 2)] to [constant-torque motor selection value (1)].

(2) When Pr. 0 setting is 2%

The Pr. 0 setting is changed to 3% (factory setting) automatically when the Pr. 71 setting is changed from [constant-torque motor selection value (1)] to [general-purpose motor selection value (0, 2)].

2.Increase the setting when the inverter-to-motor distance is long or motor torque in the low-speed range is insufficient, for example. A too large setting may result in an overcurrent trip.

3.The RT signal serves as the second function selection signal and makes the other second functions valid. Refer to page 138 for Pr. 180 to Pr. 186 (input terminal function selection).

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