Foreseeable Misuse; Block Diagram Of The Drive - Danfoss VLT FC 280 Operating Manual

Operating Guide | VLT® Midi Drive FC 280

Foreseeable misuse

Do not use the drive in applications which are non-compliant with specified operating conditions and environments. Ensure compliance
with the conditions specified in chapter Specifications.
1.4.2

Block Diagram of the Drive

T2/T4
1 2 3
4
5
S2
1 2
4
9
Figure 1: Block Diagram of the Drive
Table 2: Functions of Each Component
Area Component
1 Mains input
2 Rectifier
3 DC bus
4 DC reactor
5 Capacitor bank
6 Inverter
7 Output to motor
8 Control circuitry
12 | Danfoss A/S © 2024.10
10 6
7
8
3 6
7
5
8
Functions
• AC mains supply to the drive.
• The rectifier bridge converts the AC input to DC current to supply inverter power.
• Intermediate DC-bus circuit handles the DC current.
• Filters the DC-link current.
• Provides mains transient protection.
• Reduces the root mean square (RMS) current.
• Raises the power factor reflected back to the line.
• Reduces 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 3-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.
M
M
Introduction
AQ381425076031en-000201 / 130R1223