Block Diagram Of The Drive; Type Approvals And Certifications - Danfoss VLT Decentral Drive FCD 302 Operating Manual

VLT® Decentral Drive FCD 302
Operating Guide
1 Inverter part
2 Fastening screws (4 x, 1 in each corner)
3 Sealing gasket
4 Inverter part plastic cover
5 Ground connection pin
6 Installation box
The unit can be configured with either service switch or circuit breaker, not both. The illustration shown is not configurable in practice, but shows
1
the respective positions of components only.

1.4.3 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.

1.5 Type Approvals and Certifications

The following list is a selection of possible type approvals and certifications for Danfoss drives:
10 | Danfoss A/S © | 2020.07
7 Display connection
8 Access to USB port
9 Service switch motor side (alternatively, switch lo-
(1)
cated on mains side, or not mounted)
10 Flat mounting brackets
11 Circuit breaker (optional)
(1)
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.
AQ267036816112EN-000101 / 130R0208
Introduction