Approvals And Certifications - Danfoss VLT Decentral Drive FCD 302 Operating Manual

Introduction
1 1
1.4.3 Block Diagram
Illustration 1.3 is a block diagram of the internal
components of the frequency converter.
Area
1 Mains input
2 Rectifier
3 DC bus
4 DC reactors
5 Capacitor bank
6 Inverter
7 Output to motor
6
VLT
Title Functions
3-phase AC mains supply to the
frequency converter.
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.
•
Provide mains 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.
The inverter converts the DC into
a controlled PWM AC waveform
for a controlled variable output to
the motor.
Regulated 3-phase output power
to the motor.
Danfoss A/S © 11/2016 All rights reserved.
®
Decentral Drive FCD 302
Area
8 Control circuitry
Illustration 1.3 Frequency Converter Block Diagram

1.5 Approvals and Certifications

Table 1.2 Approvals and Certifications
More approvals and certifications are available. Contact the
local Danfoss partner. Frequency converters of enclosure
size T7 (525–690 V) are UL certified for only 525–600 V.
The frequency converter complies with UL 508C thermal
memory retention requirements. For more information,
refer to the section Motor Thermal Protection in the
product-specific 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
product-specific design guide.
Title Functions
•
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.
MG04F502