technical data
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4
4.
TECHNICAL DATA
4.1
Introduction
The figure below presents the block diagram of the Vacon NX inverter. The inverter mechanically
consists of two 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 in order 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 keypad. 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.
Figure
4
-
1. The block diagram of Vacon NX inverter
=
B +
D C+
D C-
U
V
W
3~
Mains
Motor
Measure-
ments
Gate
Drivers
Motor
Control
ASIC
Motor and
Application
Control
Control
Keypad
Fan
Current
Sensors
IGBT
Inverter
Output
EMC-
filter
Power
Supply
Control
I/O
Control
I/O
Control
I/O
Control
I/O
Control
I/O
Integrated charging circuit
Control
module
Power
module
Charg.res.
Summary of Contents for NXI Series
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