1 Introduction to VLT 2800
1.1 Purpose of the Manual
This Design Guide is intended for project and systems
engineers, design consultants, and application and product
specialists. Technical information is provided to understand
the capabilities of the frequency converter for integration
into motor control and monitoring systems. Details
concerning operation, requirements, and recommendations
for system integration are described. Information is proved
for input power characteristics, output for motor control,
and ambient operating conditions for the converter.
Also included are safety features, fault condition
monitoring, operational status reporting, serial communi-
cation capabilities, and programmable options and
features. Design details such as site requirements, cables,
fuses, control wiring, the size and weight of units, and
other critical information necessary to plan for system
integration is also provided.
Reviewing the detailed product information in the design
stage is helpful in developing a well-conceived system
with optimal functionality and efficiency.
VLT
®
is a registered trademark.
1.2 Available Documentation
Documentation is available to understand specific
frequency converter functions and programming.
•
VLT 2800 Quick Guide
•
VLT 2800 Design Guide
•
VLT 2800 Filter Instruction
•
Brake Resistor Manual
•
Profibus DP V1 Manual
•
Profibus DP Manual
•
VLT 2800 DeviceNet Manual
•
Metasys N2 Manual
•
Modbus RTU Manual
•
Precise Stop
•
Wobble Function
•
VLT 2800 NEMA 1 Terminal Covering
•
VLT 2800 LCP Remote-mounting Kit
•
Protection against Electrical Hazards
1.3 Document and Software Version
Edition
Remarks
Software version
MG27E4
Replaces MG27E3
3.2X
1.4 Technology
1.4.1 Control Principle
A frequency converter rectifies AC voltage from the mains
supply into DC voltage, and changes this voltage to an AC
voltage with variable amplitude and frequency.
The motor thus receives a variable voltage and frequency,
which enables infinitely variable speed control of 3-phase,
standard AC motors.
Illustration 1.1 Control Principle
1. Mains voltage
1x220-240 V AC, 50/60 Hz
3x200-240 V AC, 50/60 Hz
3x380-480 V AC, 50/60 Hz
2. Rectifier
3-phase rectifier bridge which rectifies AC voltage into DC
voltage.
3. Intermediate circuit
DC voltage 2 x mains voltage [V].
4. Intermediate circuit coils
Evens out the intermediate circuit current and limits the
load on mains and components (mains transformer, cables,
fuses and contactors).
5. Intermediate circuit condenser
Evens out the intermediate circuit voltage.
6. Inverter
Converts DC voltage into a variable AC voltage with a
variable frequency.
7. Motor voltage
Variable AC voltage depending on supply voltage.
Variable frequency: 0.2-132/1-590 Hz.
8. Control card
The control card controls the inverter which generates the
pulse pattern converting the DC voltage into variable AC
voltage with a variable frequency.
Introduction to VLT 2800
Design Guide
6
Danfoss A/S © Rev. May/2014 All rights reserved.
MG27E402
1
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