E-19
3) Increasing starting torque
Setting of V/F control mode selection to (automatic torque boost control)
Detects load current in all speed ranges and automatically adjusts voltage output (torque boost) from inverter.
This gives steady torque for stable runs.
:Automatically
adjusts the
amountof torque
.
Base frequency voltage
Output frequency
Base frequency
0
Note: This control system can oscillate and destabilize runs depending on the load. If that should
happen, set V/F control mode selection to 0 (V/F constant) and increase torque manually.
★ Motor constant must be set
If the motor you are using is a 4P Sumitomo AF motor and if it has the same capacity as the inverter, there is
basically no need to set the motor constant. In any other case, be sure to set the parameters to
properly.
Be sure to set (rated current of motor) and (rated speed of motor) correctly, as specified on
the motor’s nameplate. For the setting of (no-load current of motor), refer to the motor test report.
There are three procedures for setting the other motor constants.
1) Auto torque boost and a motor constant (auto-tuning) can be set at once.
To do so, set the basic parameter to . ⇒For details, see 1 in 5.2.
2) The motor constant can be automatically set (auto-tuning). Set the extended parameter to .
⇒ For details, see selection 2 in 6.17.
3) Each motor constant can be set individually. ⇒ For details, see selection 3 in 6.17.
4) Sensorless vector control - increasing starting torque and achieving high-
precision operation.
Setting of V/F control to 3 (Sensorless vector control)
Using sensor-less vector control with a Sumitomo AF motor will provide the highest torque at the low speed
ranges.
(1) Provides large starting torque.
(2) Effective when stable operation is required to move smoothly up from the low speeds.
(3) Effective in elimination of load fluctuations caused by motor slippage.
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