Internal Controller Functions - Danfoss VLT FC 103 Operating Instructions Manual

Introduction

1.6 Internal Controller Functions

Illustration 1.5 is a block diagram of the frequency
converter's internal components.
Illustration 1.5 Frequency Converter Block Diagram
MG16J202
Operating Instructions
Area
1
2
3
4
5
6
7
8
Table 1.2 Legend to Illustration 1.5
Danfoss A/S © Rev. 05/2014 All rights reserved.
Title
•
3-phase AC mains supply to the
Mains input
frequency converter
•
The rectifier bridge converts the
AC input to DC current to
Rectifier
supply inverter power.
•
Intermediate DC-bus circuit
DC-bus
handles the DC current.
•
Filter the intermediate DC circuit
voltage.
•
Prove line transient protection.
•
Reduce RMS current.
DC reactors
•
Raise the power factor reflected
back to the line.
•
Reduce harmonics on the AC
input.
•
Stores the DC power.
•
Capacitor bank Provides ride-through protection
for short power losses.
•
Converts the DC into a
controlled PWM AC waveform
Inverter
for a controlled variable output
to the motor.
•
Regulated 3-phase output
Output to motor
power to the motor
•
Input power, internal
processing, output, and motor
current are monitored to
provide efficient operation and
control.
Control circuitry
•
User interface and external
commands are monitored and
performed.
•
Status output and control can
be provided.
1
Functions
7
1