Chapter 3 Product Overview; What This Chapter Contains; Basic Principles - INVT Goodrive300 Series Operation Manual

Goodrive300 Series VFD

3.1 What this chapter contains

This chapter briefly describes the operation principle, product characteristics, layout, name plate and
model information.

3.2 Basic principles

Goodrive300 series VFDs are wall, flange, and floor mountable devices for controlling asynchronous
AC induction motors and permanent-magnet synchronous motors.
The diagram below shows the simplified main circuit diagram of the VFD. The rectifier converts
three-phase AC voltage to DC voltage. The capacitor bank of the intermediate circuit stabilizes the
DC voltage. The inverter transforms the DC voltage back to AC voltage for the AC motor. The brake
pipe connects the external braking resistor to the intermediate DC circuit to consume the fed-back
energy when the voltage in the circuit exceeds its maximum limit.
R
S
T
PE
R
S
T
PE

Chapter 3 Product overview

(+)
(-)
Figure 3-1 Main circuit of 380V VFDs (≤ 30kW)
DC reactor (+)
P1
(-)
Figure 3-2 Main circuit of 380V VFDs (≥37kW)
PB
7
Product overview
U
V
W
PE
U
V
W
PE