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4.2 Parameter Function Details
PARAMETERS
66
4.2 Parameter Function Details
4.2.1 Torque boost (Pr. 0, Pr. 46)
Pr. 0 "torque boost"
Pr. 46 "second torque boost"
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
Number
Factory
Setting
Setting Range Remarks
0.75K 6%
1.5K to 3.7K 4%
5.5K, 7.5K 3%
0
11K or more 2%
0 to 30%
46 9999 0 to 30%, 9999 9999: Function invalid
Pr.0
Pr.46
0
100%
Base frequenc
y
Output
voltage
Setting
range
Output
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).
Pr. 3 "base frequency"
Pr. 19 "base frequency voltage"
Pr. 71 "applied motor"
Pr. 180 to Pr. 186
(input terminal function selection)
Related parameters