Danfoss VLT FC 103 Instruction Manual page 11

Introduction
Area Title
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1 Mains input
•
2 Rectifier
•
3 DC bus
•
4 DC reactors
•
•
•
•
•
5 Capacitor bank
•
•
6 Inverter
•
7 Output to motor
•
8 Control circuitry
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Table 1.2 Legend to Figure 1.3
®
VLT Refrigeration Drive Instruction Manual
Functions
Three-phase AC line power
supply to the adjustable
frequency drive
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
®
MG16J122 - VLT is a registered Danfoss trademark
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