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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.)
Increase this value for use when the
inverter-to-motor distance is long or
motor torque is insufficient in the low
speed range (stall prevention is
activated).
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% 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 Type Inverter Capacity Factory Setting Constant-torque Motor Setting
FR-S520E
FR-S510WE
0.1K to 0.75K
6%
6% (no change)
1.5K to 3.7K 4%
FR-S540E
0.4K, 0.75K 6% 6% (no change)
1.5K
5%
4%
2.2K
3%
3.7K 4%
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 98)
• Constant-torque motor setting ⇒ Pr. 71 "applied motor" (refer to page 69)
• Automatic torque boost control selection ⇒ Pr. 98 "automatic torque boost selection (motor
capacity)" (refer to page 121)
Pr.0
Pr.46
Setting range
0 Output frequency (Hz)
Output
voltage