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Introduction
1.3 Additional Resources
Other resources are available to understand advanced
1
1
frequency converter functions and programming.
•
The VLT
detail on working with parameters and many
application examples.
•
The VLT
detailed capabilities and functionality to design
motor control systems.
•
Supplemental publications and manuals are
available from Danfoss.
See http://www.danfoss.com/BusinessAreas/Drives-
Solutions/Documentations/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: http://
www.danfoss.com/BusinessAreas/DrivesSolutions/
Documentations/Technical+Documentation.htm, for
downloads or additional information.
1.4 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 position sensors on a
conveyor belt. 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.
1.5 Internal Controller Functions
Illustration 1.4 is a block diagram of the frequency
converter's internal components. See Table 1.3 for their
functions.
6
VLT
Operating Instructions
®
Programming Guide provides greater
®
Design Guide is intended to provide
MG21A202 - VLT
®
AQUA Drive D-Frame
Illustration 1.4 Frequency Converter Block Diagram
Area
1
Mains input
2
Rectifier
3
DC bus
4
DC reactors
5
Capacitor bank
6
Inverter
7
Output to motor
8
Control circuitry
Table 1.3 Frequency Converter Internal Components
®
is a registered Danfoss trademark
Title
Functions
•
Three-phase AC mains power
supply to the frequency
converter
•
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
•
Input power, internal
processing, output, and motor
current are monitored to
provide efficient operation
and control
•
User interface and external
commands are monitored and
performed
•
Status output and control can
be provided
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