Table of Contents
Advertisement
Operating Guide | VACON® NX Inverters FI4-FI8
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, 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.
Mains
B+
Integrated charging circuit
DC+
DC-
PE
Control
Unit
Illustration 1:
Block Diagram of VACON
Danfoss A/S © 2019.07
®
NX inverter. The inverter mechanically consists of 2 units: the Power Unit and the
Power
Unit
Charge res
Fan
Power
Supply
Control
Panel
Control
Control
I/O
I/O
®
NX Inverter
IGBT
Inverter
3
Measure-
ments
Gate
Drivers
Motor and
Motor
Application
Control
Control
ASIC
Control
Control
Control
I/O
I/O
I/O
Product Overview
Current
Motor
Sensors
U
Output
V
EMC-
filter
W
AQ299433367205en-000101 / DPD00908| 15
Advertisement
Table of Contents
