3 Product Overview
3.1 Introduction
The figure presents the block diagram of the VACON
®
NX inverter. The inverter mechanically consists of 2 units: the Power Unit and the
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, the Power Unit also contains a charging circuit for controlled DC-link charge.
Use the B+ and DC-terminals to bypass the charging circuit.
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.
3
Power
Unit
Mains
Integrated charging circuit
B+
DC+
DC-
PE
Control
Unit
Control
Panel
Control
I/O
Control
I/O
Control
I/O
Control
I/O
Control
I/O
Motor and
Application
Control
Motor
Control
ASIC
Charge res
IGBT
Inverter
Current
Sensors
Motor
Fan
Power
Supply
Measure-
ments
Gate
Drivers
Output
EMC-
filter
U
V
W
e3
0b
h4
33
.1
0
Illustration 1: Block Diagram of VACON
®
NX Inverter
Product Overview
Operating Guide | VACON® NX Inverters FI4-FI8
AQ299433367205en-000101 / DPD00908| 15
Danfoss A/S © 2019.07
Summary of Contents for VACON NX FI4
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