Honeywell 3G SmartVFD HVFD3D3A0015 Installation And User Manual page 13

1.3.3 Block Diagram of the Adjustable Frequency Drive
Figure 1.6 is a block diagram of the internal components of the adjustable fre-
quency drive. See Table 1.1 for their functions.
Figure 1.6. Adjustable Frequency Drive Block Diagram.
Table 1.1. Legend to Figure 1.6.
Area
1
2
3
4
5
6
7
8
1.3.4 Enclosure Types and Power Ratings
For enclosure types and power ratings of the adjustable frequency drives, refer to
Chapter 8.9 Power Ratings, Weight and Dimensions.
8
Title Functions
•
Line power input
•
Rectifier
•
DC bus
•
DC reactors
•
•
•
•
•
Capacitor bank
•
•
Inverter
•
Output to motor
•
Control circuitry
•
•
3-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 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
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