technical data vacon • 15
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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.
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 NXI inverter
U
V
W
RS 232
NK4_1
B+
B-
Measur
e-
ments
Driver
ASIC
Control
Control
Keypad
Fan
IGBT
bridge
Power
Supply
I/O
Slot A
I/O
Slot B
Control
module
Power
module
I/O
Slot C
I/O
Slot D
I/O
Slot E
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