Lenze E84DSxxx - Manual (Page 108)

5 Motor control (MCTRL)
5.2 Selecting the control mode
108
Lenze · 8400 protec StateLine · Reference manual · DMS 4.2 EN · 03/2013 · TD05
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V/f characteristic control (VFCplus)
The V/f characteristic control (VFCplus) is a motor control mode for standard frequency inverter
applications based on a simple and robust control process which is suitable for the operation of
asynchronous motors with linear or square-law load torque characteristic (e.g. fans). Furthermore,
this motor control mode is also suitable for group drives and special motors. Due to the low
parameterisation effort, commissioning of such applications is fast and easy.
The V
min
boost ( C00016 ) and slip compensation ( C00021 ) required for optimising the drive
behaviour are dimensioned for asynchronous motors with power adaptations to the inverter in the
Lenze setting.

V/f characteristic control (VFCplus) ( 114)
V/f control (VFCplus + encoder)
V/f control can be selected if operation with speed feedback is required. This motor control includes
an additional parameterisable slip regulator which dynamically adapts the actual speed value to the
speed setpoint.
 V/f control (VFCplus + encoder) ( 130)
Sensorless vector control (SLVC)
Sensorless (field-oriented) vector control 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) ( 136)