Lenze DSD - Manual (Page 354)

11 Drive Dimensioning
11.6 Inverters
354
Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
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11.6.2.4 Motor control
11.6.2.5 Control system
Symbol Description
Motor control Type of motor control
• Some frequency inverters provide the possibility of using a speed feedback (with or without
feedback system).
• In the case of servo inverters a speed feedback always has to be available (with feedback sys-
tem).
Symbol Description
Control system SC Servo control
Field-oriented control with current model.
• Division of the motor current into field current and torque generating cur-
rent.
• Feedback required!
VFCplus V/f control
Simple voltage activation with linear characteristic.
• Not suitable for hoist drives >7.5 kW!
• An optimal torque utilisation is achieved with feedback.
SLVC Sensorless vector control
Voltage implanting motor control via motor model.
• No feedback required.
• Features a high overload capacity.
VFCplus eco V/f control with energetically optimised field injection in partial load operation-
al range.

Note!
For applications on an inclined plane with a max. required power > 7.5 kW, operation
with VFCplus is not recommended because of the increased required power within low-
ering operation (high motor excitation)!