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Explanation of functions (parameters)
2
FUNCTIONS
2.3 Explanation of functions (parameters)
2.3.1 Torque boost (Pr. 0 , Pr. 46 )
<Setting>
•Assuming that the base frequency voltage is 100%, set the 0Hz voltage in %.
Use the RT signal to switch between two different torque boosts. (Turn on the RT
signal to make Pr. 46 valid(*).)
When using an inverter-dedicated motor (constant-torque motor), make setting as
indicated below.
(If the factory set Pr. 71 value is changed to the setting for use with a constant-torque
motor, the Pr. 0 setting changes to the corresponding value in the following table.)
<200V class>
<400V class>
Increase the setting value when the
distance between the inverter and
motor is long or when the motor torque
in the low speed range is insufficient
(when stall prevention is activated), etc.
Motor torque in the low-frequency
range can be adjusted to the load to
increase the starting motor torque.
Parameter Name Factory Setting Setting Range Remarks
0 Torque boost
6%/5%/4%/3%/
2%(*)
0 to 15%
*The factory setting varies according
to the inverter capacity. (Refer to the
following table for details.)
46
Second
torque boost
- - -
0 to 15%,
- - -
- - -: Function invalid. Setting is
enabled when Pr. 30 = "1".
REMARKS
* The RT signal acts as the second function selection signal and makes the other second functions valid.
Inverter Capacity Factory Setting Constant-torque Motor Setting
0.4K, 0.75K
6%
6% (no change)
1.5K to 3.7K 4%
5.5K, 7.5K 4% 3%
11K, 15K 3% 2%
Inverter Capacity Factory Setting Constant-torque Motor Setting
0.4K, 0.75K 6% 6% (no change)
1.5K
5%
4%
2.2K 3%
3.7K 4% 3%
5.5K, 7.5K 3% 2%
11K, 15K 2% 2% (no change)
CAUTION
•Selecting automatic torque boost control makes this parameter setting invalid.
•A too large setting may cause the motor to overheat or result in an
overcurrent trip. The guideline is about 10% at the greatest.
♦Related parameters♦
• RT signal (second function "Pr. 46") setting⇒ Pr. 60 to Pr. 63 "input terminal function selection"
(refer to page 109)
• Constant-torque motor setting ⇒ Pr. 71 "applied motor" (refer to page 80)
• Automatic torque boost control selection ⇒ Pr. 98 "automatic torque boost selection (motor
capacity)" (refer to page 133)
Pr.0
Pr.46
Setting range
0
Output frequency (Hz)
Output voltage