Product Overview; Introduction - Danfoss VACON NXP FI9 Operating Manual

Operating Guide | VACON® NXI Inverters FI9-FI14

3 Product Overview

3.1 Introduction

The figure presents the block diagram of the VACON
control unit.
The power unit contains an inverter bridge which consists of IGBT switches and produces a symmetrical, 3-phase PWM-modulated AC
voltage to the motor. To protect the DC-link capacitors, capability of DC-charging is required.
The motor and application control block is based on microprocessor software. The microprocessor controls the motor based on the
information it receives through measurements, parameter settings, control I/O, and control panel.
The motor and application control block controls the motor control ASIC which, in turn, calculates the IGBT positions. Gate drivers
amplify these signals for driving the IGBT inverter bridge.
Power
Unit
B+
B-
Control
Panel
Control
Unit
I/O
Slot A
Illustration 1: Block Diagram of VACON
Danfoss A/S © 2019.11
®
NX inverter. The inverter mechanically consists of 2 units: the power unit and the
Fan
Power
Supply
Control
I/O I/O
Slot B Slot C
®
NX Inverter
IGBT
bridge
Measure-
Driver
ments
ASIC
I/O I/O
Slot D Slot E
Product Overview
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