Purpose Of The Manual; Product Overview; Internal Adjustable Frequency Drive Controller Functions - Danfoss VLT FC 103 Instruction Manual

Introduction

1.1 Purpose of the Manual

1 1
This manual is intended to provide detailed information for
the installation and start-up of the adjustable frequency
drive. chapter 2 Installation provides requirements for
mechanical and electrical installation, including input,
motor, control and serial communications wiring and
control terminal functions. chapter 3 Start-up and Functional
Test provides detailed procedures for start-up, basic
operational programming, and functional testing. The
remaining chapters provide supplementary details. These
details include user interface, detailed programming,
application examples, start-up troubleshooting, and specifi-
cations.

1.2 Product Overview

An adjustable frequency drive is an electronic motor
controller that converts AC line power input into a variable
AC waveform output. The frequency and voltage of the
output are regulated to control the motor speed or torque.
The adjustable frequency drive can vary the speed of the
motor in response to system feedback, such as changing
temperature or pressure for controlling fan, compressor, or
pump motors. The adjustable frequency drive can also
regulate the motor by responding to remote commands
from external controllers.
In addition, the adjustable frequency drive monitors the
system and motor status, issues warnings or alarms for
fault conditions, starts and stops the motor, optimizes
energy efficiency, and offers many more control,
monitoring, and efficiency functions. Operation and
monitoring functions are available as status indications to
an outside control system or serial communication
network.
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Instruction Manual
1.3 Internal Adjustable Frequency Drive
Figure 1.3 is a block diagram of the adjustable frequency
drive's internal components. See Table 1.3 for their
functions.
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
Controller Functions
Figure 1.3 Adjustable Frequency Drive Block Diagram
Area Title
•
1 Line power input
•
2 Rectifier
•
3 DC bus
•
•
•
4 DC reactors
•
•
•
•
5 Capacitor bank
•
6 Inverter
•
7 Output to motor
Functions
Three-phase AC line power
supply to the adjustable
frequency drive
The rectifier bridge converts
the AC input to DC current to
supply inverter power
Intermediate DC bus circuit
handles the DC current
Filter the intermediate DC
circuit voltage
Prove line transient protection
Reduce RMS current
Raise the power factor
reflected back to the line
Reduce harmonics on the AC
input
Stores the DC power
Provides ride-through
protection for short power
losses
Converts the DC into a
controlled PWM AC waveform
for a controlled variable
output to the motor
Regulated three-phase output
power to the motor
MG16E222