Danfoss 102 Betriebsanleitung Seite 6

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1.5 Block Diagram of the Frequency
Converter
Illustration 1.1 is a block diagram of the frequency
converter's internal components. See Table 1.2 for their
functions.
Illustration 1.1 Frequency Converter Block Diagram
Area Title Functions
1 Mains input
3-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 3-phase output
power to the motor
Area Title Functions
8 Control circuitry
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
Table 1.2 Legend to Illustration 1.1
1.6 Enclosure Types and Power Ratings
For enclosure types and power ratings of the frequency
converters, refer to 8.9 Power Ratings, Weight and
Dimensions.
1.7 Approvals and Certifications
Table 1.3 Approvals and Certifications
More approvals and certifications are available. Contact
local Danfoss partner. The T7 (525-690 V) frequency
converters are not certified for UL.
The frequency converter complies with UL508C thermal
memory retention requirements. For more information
refer to the section Motor Thermal Protection in the Design
Guide.
For compliance with the European Agreement concerning
International Carriage of Dangerous Goods by Inland
Waterways (ADN), refer to ADN-compliant Installation in the
Design Guide.
1.8
Disposal Instruction
Do not dispose of equipment containing
electrical components together with
domestic waste.
Collect it separately in accordance with
local and currently valid legislation.
Table 1.4 Disposal Instruction
Introduction
VLT
®
HVAC Drive Operating Instructions
4 MG11AJ02 - Rev. 2013-07-31
1
1
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