Block Diagram Of The Drive; Type Approvals And Certifications - Danfoss VLT FC 102 Operating Manual

VLT HVAC Drive FC 102
Operating Guide

1.3.3 Block Diagram of the Drive

Illustration 3: Block Diagram
1
Mains input
• 3-phase AC mains power supply to the drive.
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 cur-
rent.
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.

1.4 Type Approvals and Certifications

The following list is a selection of possible type approvals and certifications for Danfoss drives:
Drives of enclosure size T7 (525–690 V) are not UL listed.
Table 2: Type Approvals and Certifications
10 | Danfoss A/S © 2023.09
5
Capacitor bank
• Stores the DC power.
• Proves 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.
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.
N O T I C E
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Introduction
AQ267037536117en-000101 / 130R0083