Product Overview; What This Chapter Contains; Basic Principles - INVT Goodrive270 Series Operation Manual

Goodrive270 series VFD for fan and pump

3.1 What this chapter contains

This chapter mainly introduces the working principles, product features, layouts, nameplates and
model designation rules.

3.2 Basic principles

The VFD is used to control asynchronous AC induction motors and permanent magnetic synchronous
motors. The following figure shows the main circuit diagram of the VFD. The rectifier converts 3PH
AC voltage into DC voltage, the capacitor bank of intermediate circuit stabilizes the DC voltage, and
then the inverter converts DC voltage into AC voltage that can be used by an AC motor.
R
S
T
PE
R
S
T
PE
Figure 3-2 Main circuit for 400–500kW (included) VFD models (with built-in DC reactors)
Note: Built-in DC reactors are standard parts only for 400–500kW VFD models.

3 Product overview

(+)
(-)
Figure 3-1 Main circuit
Optional DC
(+)
reactor
(-)
-8-
Product overview
U
V
W
PE
U
V
W
PE