Lenze 8400 - Manual (Page 142)

5 Motor control (MCTRL)
5.2 Selecting the control mode
142
Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Sensorless vector control (SLVC)
Sensorless (field-oriented) vector control for asynchronous motors is based on a decoupled,
separate control for the torque-producing and the field-producing current component. In addition,
the actual speed is reconstructed by means of a motor model so that a speed sensor is not required.
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 implementation of torque-actuated operation with speed limitation
• The limitation of the maximum torque in motor and generator mode for speed-actuated
operation

Tip!
If a high torque without feedback is to be provided at small speeds, we recommend the
"Sensorless vector control" motor control mode.
 Sensorless vector control (SLVC) ( 182)
Sensorless control for synchronous motors (SLPSM)
From version 12.00.00
This sensorless control enables an encoderless control of synchronous motors. The process is based
on field-oriented control within a higher speed range (e.g. > 10 % of the rated motor speed). The
actual speed value and rotor position are reconstructed via a motor model.
Standard applications for this control type are pumps and fans, horizontal materials handling and
simple positioning technology.
 Sensorless control for synchronous motors (SLPSM) ( 198)
Servo control (SC)
Field-oriented servo control (SC) for asynchronous motors is based on a decoupled, separate control
of the torque-producing and the field-producing current component. The motor control is based on
a field-oriented, cascaded controller structure with feedback function and enables dynamic and
stable operation in all of the four quadrants.
The servo control basically offers the same advantages as the sensorless vector control (SLVC).
 Servo control (SC) ( 219)