Lenze 8400 BaseLine D - Manual (Page 88)

5 Motor control (MCTRL)
5.5 Sensorless vector control (SLVC)
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Lenze · 8400 BaseLine D · Reference manual · DMS 5.5 EN · 01/2014 · TD05
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5.5 Sensorless vector control (SLVC)
Sensorless vector control (SLVC) is based on a better motor current control according to the Lenze
FTC process.
In comparison to the V/f characteristic control without feedback, the following can be achieved by
means of sensorless vector control SLVC:
• A higher maximum torque throughout the entire speed range
• A higher speed accuracy
• A higher concentricity factor
• A higher level of efficiency
• The limitation of the maximum torque in motor and generator mode for speed-actuated opera-
tion

Stop!
• The connected motor must not be more than two power classes smaller than the mo-
tor assigned to the controller.
• Operation of the sensorless vector control (SLVC) is only permissible for one single dri-
ve!
• Operation of the sensorless vector control (SLVC) is not permissible for hoists!
• The Lenze setting permits the operation of a power-adapted motor. Optimal operati-
on is only possible if either:
• the motor is selected via the Lenze motor catalogue
• the motor nameplate data are entered and motor parameter identification is car-
ried out afterwards
- or -
• the nameplate data and equivalent circuit data of the motor (motor leakage induc-
tance and mutual motor inductance, slip compensation and motor stator resis-
tance) are entered manually.
• When you enter the motor nameplate data, take into account the phase connection
implemented for the motor (star or delta connection). Only enter the data applying to
the selected connection type.
• In this context, also observe the instructions in the chapter entitled " Adapting the
V/f base frequency " relating to V/f characteristic control. ( 84)

Note!
Optimal operation of the sensorless vector control (SLVC) can be achieved from a mini-
mum speed of approx. 0.5-fold slip speed. At lower speed values below the 0.5-fold slip
speed, the maximum torque is reduced.
The maximum field frequency with this motor control mode is 650 Hz.