Vacon 100 Industrial Applications Manual page 211

PARAMETER DESCRIPTIONS
the advanced sensorless control, a simple closed loop motor control can be replaced with a
high-performance open loop motor control. An example of a possible application is an
extruder.
The advanced sensorless control function is not supported when a sine filter or a harmonic
filter is used.
This control mode is sensitive about accurate motor parameterisation and requires expert
knowledge in the commissioning. We strongly recommend you 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 selection between frequency, speed and torque control is
still done with P3.1.2.1 Control Mode.
When you are commissioning the sensorless control function, always do these steps:
Do identification with rotation (P1.15/P3.1.2.4 = 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 magnetisation to build up rotor flux. With a PM
motor, using start magnetisation is highly recommended to make sure that the rotor
alignment is correct.
The identification with rotation is necessary because the advanced sensorless control is
sensitive about accurate motor parameterisation. We recommend you to use 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 in
case of instability at low frequency that can cause continuous high current that increases the
motor temperature.
In the speed control mode with an IM motor, especially the generator side must be taken into
account because the flux frequency is smaller than the shaft frequency because of the slip
frequency.
NOTE!
The characteristics of the application have an effect on the optimal settings of the
control mode parameters.
P3.1.6.1 SENSORLESS CONTROL (ID 1724)
Use this parameter to enable the sensorless control function.
P3.1.6.3 SENSORLESS CONTROL OPTIONS (ID 1726)
Use this parameter to set the options of the advanced sensorless control. The parameter has
a checkbox selection of values.
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