Purpose Of The Manual; Product Overview; Internal Frequency Converter Controller Functions - Danfoss VLT FC 103 Operating Instructions Manual

Introduction

1.1 Purpose of the Manual

This manual is intended to provide detailed information for
1 1
the installation and start up of the frequency converter.
2 Installation provides requirements for mechanical and
electrical installation, including input, motor, control and
serial communications wiring and control terminal
functions. 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 specifications.

1.2 Product Overview

A frequency converter is an electronic motor controller
that converts AC mains input into a variable AC waveform
output. The frequency and voltage of the output are
regulated to control the motor speed or torque. The
frequency converter 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 frequency converter can also regulate
the motor by responding to remote commands from
external controllers.
In addition, the frequency converter 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.
1.3 Internal Frequency Converter Controller
Functions
Illustration 1.3 is a block diagram of the frequency
converter's internal components. See Table 1.3 for their
functions.
I I llustration 1.3 Frequency Converter Block Diagram
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VLT Refrigeration Drive FC 103 1.1-90 kW Operating Instructions
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Table 1.3 Legend to Illustration 1.3
MG16E202 - VLT® is a registered Danfoss trademark
Title
•
Three-phase AC mains power
supply to the frequency
Mains input
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
•
Provides ride-through
Capacitor bank
protection for short power
losses
•
Converts the DC into a
controlled PWM AC waveform
Inverter
for a controlled variable
output to the motor
•
Regulated three-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
Functions