Technical Data; Introduction - Honeywell NX series User Manual

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4.

TECHNICAL DATA

4.1

Introduction

Figure 4-1 presents the block diagram of the NX frequency converter. The frequency converter mechani-
cally consists of two units, the Power Unit and the Control Unit. Pictures of the mechanical assemblage on
pages 54 to 62.
The three-phase AC-choke (1) at the mains end together with the DC-link capacitor (2) form an LC-filter,
which, again, together with the diode bridge produce the DC-voltage supply to the IGBT Inverter Bridge (3)
block. The AC-choke also functions as a filter against High Frequency disturbances from the mains as well
as against those caused by the frequency converter to the mains. It, in addition, enhances the waveform of
the input current to the frequency converter. The entire power drawn by the frequency converter from the
mains is active power.
The IGBT Inverter Bridge 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 con-
trols the motor basing 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.
Mains
L1
L2
L3
PE
*The brake resistor can be installed internally in sizes FR4 to FR6 (NX_2 and NX_5). In all other
frames of voltage classes NX_2 and NX_5, as well as in all frames of all other voltage classes, the
brake resistor is available as option and installed externally.
Brake chopper belongs to the standard equipment in sizes FR4 to FR6, while in greater sizes
(FR7 to FR9) it is optional.
Figure 4-1. NX block diagram

TECHNICAL DATA

Power
module
1)
Integrated input module
Rectifier
3~
Charg.res.
Fan
Power
Supply
Control
Keypad
Control
module
Control Control
I/O I/O
Brake resistor*
Brake
3)
Chopper*
IGBT
Inverter
=
2)
=
3~
Measure-
ments
Gate
Drivers
Motor and
Motor
Application
Control
RS 232
Control
ASIC
Control Control Control
I/O I/O
Current
Motor
Sensors
U
Output
V
filter
W
I/O
NK4_1