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7 Advanced Settings
High-function General-purpose Inverter RX2 Series User’s Manual
7-2 Selection of Motor Control Methods
7
7-2-8 Sensorless Vector Control
Parameter
This application is used on such as conveyors and machine tools, that carry heavy loads and require a
high torque.
Automatically adjust the frequency and the output voltage so as to achieve responsively a higher torque
even at slow speeds.
In the sensorless vector control, to control the motor, the frequency and the output voltage are cor-
rected and the response is adjusted with respect to the load inertia.
A motor constant and the load inertia must be set with auto-tuning, etc.
In the sensorless vector control, adjustment of the response is possible. The sensorless vector control
can be used in applications that require a better follow-up performance of the frequency to the com-
mand.
When a motor is hunting and vibrating, an adjustment of the speed response [HA115] may improve the
state of the motor.
To limit the output direction by enabling the reversal prevention function [HC114].
To correct the slip change caused by temperature changes by enabling the selection of the secondary
resistance correction [HC113]. Connection is needed between a thermistor for measuring the tempera-
ture of the motor and the TH terminal.
Precautions for Correct Use
• In the sensorless vector control, set appropriately the motor capacity, the number of motor
poles, the base frequency, the rated voltage, and the rated current in order to conduct motor
control.
• When the motor performs below its potential characteristics, conduct the auto-tuning and
make adjustment by referring to the next section.
• In the cases of a long wiring (approximately longer than 20 m) and in the cases of controlling
motors other than out company’s, the performance may be below what are expected from the
characteristics.
• As the capacity becomes farther away from the maximum applicable motor capacity, suffi-
cient operation characteristics becomes more difficult to get.
Item Parameter Data Description
Default
data
Stabilization con-
stant, 1st-motor
[HA110] 0 to 1000(%)
To adjust the control for reducing the hunting of
motors.
100
Output voltage
gain, 1st-motor
[Hb180] 0 to 255(%)
Decrease it if the motor is hunting. A lower set-
ting decreases the output voltage.
100
Carrier speed set-
ting, 1st-motor
[bb101]
0.5 to
16.0(kHz)
*1
*1. Some settings may limit the carrier frequency. For details, see 7-4 Reduction of Motor Noise, Noise and
Inverter Heat Generation on page 7-59.
Change the carrier frequency of the PWM out-
put. If the motor is hunting, lower the setting.
2.0
7-2-8 Sensorless Vector Control
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