Available Control Types; Control Types - WEG CFW-11 Programming Manual

8 AVAILABLE CONTROL TYPES

8.1 CONTROL TYPES

The inverter feeds the motor with variable voltage, current and frequency, by means of whose the control of
the motor speed is obtained. The values applied to the motor follow a control strategy, which depends on the
selected type of control and on the inverter parameter settings.
Choose the control type in function of the static and dynamic, torque and speed requirements of the driven load.
Control modes and their main characteristics:
 V/f: scalar control; it is the simplest control mode, by imposed voltage/frequency; with an open loop speed
regulation or with slip compensation (programmable); it allows multimotor operation.
 VVW: Voltage Vector WEG; it allows a static speed control more accurate than the V/f mode; it adjusts
itself automatically to the line variations, and also to the load variations, however it does not present fast
dynamic response.
 Sensorless Vector: it is a field oriented control; without motor speed sensor; able to drive any standard
motor; speed control range of 1:100; speed control static precision of 0.5 % of the rated speed; high
control dynamics.
 Vector with Encoder: it is a field oriented control; it needs motor encoder and inverter encoder interface
module (ENC1 or ENC2); speed control down to 0 rpm; speed control static precision of 0.01 % of the
rated speed; high static and dynamic performance of the speed and torque control.
 Vector with Encoder for PMSM motor: It requires an incremental encoder at the motor and the encoder
interface module (ENC1, ENC2 or PLC11) at the inverter.
 Sensorless Vector for PMSM motor: Without speed sensor at the motor; Speed control range 1:100.
All these control modes are described in details in the
Chapter 10 VVW CONTROL on page
21 PM VECTOR CONTROL on page
of these modes.
Chapter 9 SCALAR CONTROL (V/F) on page
10-1, Chapter 11 VECTOR CONTROL on page
21-1, the related parameters and orientations regarding the use of each
Available Control Types
9-1,
11-1, and Chapter
8-1
8