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VACON® 3000
Application Guide
This control mode is sensitive about accurate motor parameterization and requires expert knowledge in the commissioning. We
strongly recommend NOT to enable this mode for regular open loop motor control applications or when expert knowledge is not
available.
The advanced sensorless control has a similar control structure to the closed loop control but with Voltage Vector Control. The se-
lection between frequency, speed, and torque control is still done with P3.1.2.1 Control Mode.
When commissioning the sensorless control function, always do these steps:
•
Do identification with rotation (P3.1.2.8.1 = 2).
•
Set reasonable minimum frequencies (P3.3.1.1-3.3.1.4).
•
Use motor stall protection (P3.9.3.1-3.9.3.4).
With an induction motor, always use start magnetization to build up rotor flux.
The identification with rotation is necessary because the advanced sensorless control is sensitive about accurate motor parameteri-
zation. We recommend using minimum frequencies because continuous operation at or near zero frequency can cause instability of
control and should be prevented. The motor stall protection function protects the motor if there is instability at low frequency that
can cause continuous high current that increases the motor temperature.
In the speed control mode with an induction motor, especially the generator side must be considered because the flux frequency is
smaller than the shaft frequency because of the slip frequency.
The characteristics of the application affect the optimal settings of the control mode parameters.
7.293 (ID 1725) Sensorless Control Mode
Location in the menu: P3.1.5.2
Use this parameter to set the sensorless control mode.
7.294 (ID 1726) Sensorless Control Options
Location in the menu: P3.1.5.3
Use this parameter to set the options of the advanced sensorless control. The parameter has a checkbox selection of values.
7.295 (ID 1727) Flux Model Coefficient 1
Location in the menu: P3.1.5.4
Use this parameter to set a value for the flux model coefficient 1.
7.296 (ID 1728) Flux Model Coefficient 2
Location in the menu: P3.1.5.5
Use this parameter to set a value for the flux model coefficient 2.
7.297 (ID 1729) Flux Model Coefficient 3
Location in the menu: P3.1.5.6
Use this parameter to set a value for the flux model coefficient 3.
7.298 (ID 1730) Voltage Drop IGBT
Location in the menu: P3.1.5.7
Use this parameter to set a value for the IGBT voltage drop in Volts.
7.299 (ID 1731) Sensorless Torque Control P Gain
Location in the menu: P3.3.2.15.1
Use this parameter to set the P gain for the torque controller in the sensorless control mode. The P Gain value 1.0 causes a 1 Hz
change in the output frequency when the torque error is 1% of the motor nominal torque.
This parameter is always active in sensorless torque control.
7.300 (ID 1732) Sensorless Torque Control I Gain
Location in the menu: P3.3.2.15.2
226 | Danfoss A/S © 2021.09
N O T I C E
Parameter descriptions
AB319735759636en-000101 / DPD01822
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