1.1 Purpose of the Manual
This manual is intended to provide detailed information for
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 Testing 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 Additional Resources
Other resources are available to understand advanced
frequency converter functions and programming.
•
The VLT
®
Programming Guide provides greater
detail on working with parameters and many
application examples.
•
The VLT
®
Design Guide is intended to provide
detailed capabilities and functionality to design
motor control systems.
•
Supplemental publications and manuals are
available from Danfoss.
See D
anfoss website BusinessAreas/DrivesSo-
lutions/Documentations/VLT+Technical
+Documentation.htm
for
listings.
•
Optional equipment is available that may change
some
of
the
procedures
described.
Reference
the
instructions supplied with those options for
specific requirements. Contact the local Danfoss
supplier or visit the Danfoss website:
BusinessAreas/DrivesSolutions/Documentations/VLT
+Technical+Documen-tation.htm, for downloads
or additional information.
1.3 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.
1.4 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.
Illustration 1.3 Frequency Converter Block Diagram
Area Title Functions
1 Mains input
•
Three-phase
AC mains power
supply to the frequency
converter
2 Rectifier
•
The rectifier bridge converts
the
AC input to DC current to
supply inverter power
3 DC bus
•
Intermediate DC-bus circuit
handles the
DC current
4 DC reactors
•
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
5 Capacitor bank
•
Stores the DC power
•
Provides
ride-through
protection for short power
losses
6 Inverter
•
Converts the DC into
a
controlled PWM AC waveform
for a controlled variable
output to the motor
7 Output to motor
•
Regulated three-phase output
power to
the motor
Introduction
VLT
®
HVAC Drive Operating Instructions
6 MG11AI02 - VLT
®
is a registered Danfoss trademark
11
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