Product Overview; Internal Adjustable Frequency Drive Controller Functions - Danfoss VLT AutomationDrive FC 303 Instruction Manual

Introduction
•
The Programming Guide provides greater detail
in how to work with parameters and many
application examples.
•
The Design Guide is intended to provide detailed
capabilities and functionality to design motor
control systems.
•
Supplemental publications and manuals are
available from Danfoss.
See http://www.danfoss.com/Products/Literature/
Technical+Documentation.htm for listings.
•
Optional equipment is available that may change
some of the procedures described. Be sure to see
the instructions supplied with those options for
specific requirements.
Contact the local Danfoss supplier or go to
http://www.danfoss.com/Products/Literature/Technical
+Documentation.htm for downloads or additional
information.

1.3 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 position
sensors on a conveyor belt. 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.
1.4 Internal Adjustable Frequency Drive
Controller Functions
Below is a block diagram of the adjustable frequency
drive's internal components. See Table 1.1 for their
functions.
VLT ® AutomationDrive Instruction
Manual
Figure 1.3 Adjustable Frequency Drive Block Diagram
®
MG.33.AI.22 - VLT is a registered Danfoss trademark
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