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Basic Functions
3.3 Basic Functions
3.3.1 Torque boost (Pr. 0)
<Setting>
•Assuming that the base frequency voltage is 100%, set the 0Hz voltage in %.
! When using an inverter-dedicated motor (constant-torque motor), make setting as
indicated below:
•FR-C520-0.1K to 0.75K ... 6%, FR-C520-1.5K to 3.7K ...... 4%
If you leave the factory setting as it is and change the Pr. 71 value to the setting for
use of the constant-torque motor, the Pr. 0 setting changes to the above value.
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.
Parame
ter
Name
Factory
Setting
Setting
Range
0 Torque boost 6% 0 to 15%
CAUTION
•A too large setting may cause the motor to overheat or result in an
overcurrent trip. The guideline is about 10% at the greatest.
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Related parameters
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• Constant-torque motor setting ⇒ Pr. 71 "applied motor" (refer to page 70)
r.0
0
Setting range
Output voltage
Output frequency (Hz)