VLT is a registered Danfoss trademark
Intro-1
PURPOSE
The purpose of this manual is to provide detailed technical
information and instructions that will enable a qualified
technician to identify faults and perform repairs on VLT series
adjustable frequency drives of 125/150 hp to 550/600 hp.
It provides the reader with a general view of the unit's main
assemblies and a description of the internal processing. With
this information, technicians should have a better understanding
of the drive's operation to assist in troubleshooting and repair.
This manual provides instructions for the drive models and
voltage ranges described in the tables on the following page.
VLT
®
PRODUCT OVERVIEW
VLT 4000 series drives are designed primarily for the industrial
market segment. This series of drives is capable of operating
only in variable torque mode and are normally found in
controlling fans and pumps in industrial process environments.
VLT 5000 series drives are fully programmable for either
constant torque or variable torque industrial applications. They
are full-featured drives capable of operating a myriad of
applications and incorporating a wide variety of control and
communication options.
VLT 6000 series drives are designed for the HVAC markets.
They operate only in variable torque mode and include special
features and options well suited for fan and pump applications
within the HVAC market.
The VLT 8000 series drives are designed for water and waste
water markets. They can operate in either constant torque
or variable torque with limited overload capabilities. They include
specific features and options which make them well suited
for use on a variety of water pumping and processing
applications.
These models are available in Chassis/IP00, NEMA 1/IP21 or
NEMA 12/IP54 enclosures.
INTRODUCTION
WARNING
!
Drives contain dangerous voltages when
connected to line voltage. Only a competent
technician should carry out service.
WARNING
!
For dynamic test procedures, main input power
is required and all line powered devices and
power supplies are energized at rated voltage.
Use extreme caution when conducting tests on
a powered drive. Contact with powered
components could result in electrical shock and
personal injury.
FOR YOUR SAFETY
1. DO NOT touch electrical parts of drive when AC
line is connected. After AC line is disconnected
wait 20 minutes before touching any components
in D-frame size units (see page 2) or 40 minutes
for E-frame size units.
2. When repair or inspection is made, AC line must
be disconnected.
3. STOP key on control panel does not disconnect
AC line.
4. During operation and while programming
parameters, motor may start without warning.
Activate STOP key when changing data.
CAUTION
!
When performing service, use proper ESD
procedures to prevent damage to sensitive
components.
ELECTROSTATIC DISCHARGE (ESD)
Many electronic components within the adjustable frequency
drive are sensitive to static electricity. Voltages so low that
they cannot be felt, seen or heard can reduce the life, affect
performance, or completely destroy sensitive electronic
components.
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