Components and their functions
provides a functional description of the drive module components. Each drive module contains the following:
•
Input rectifier section.
•
Intermediate DC bus section.
•
Inverter section.
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Illustration 3.4 Drive Module Block Diagram
Area
Title
Functions
1
Mains input
3-phase AC mains power input to the drive module.
2
Input rectifier section
Converts mains input AC voltage into DC voltage.
3
Intermediate DC bus section
Act as a filter and stores energy in the form of DC voltage.
4
DC reactors
The DC reactors:
•
Filter the intermediate DC circuit voltage.
•
Reduce RMS current.
•
Raise the power factor reflected back to the line.
•
Reduce harmonics on the AC input.
5
Capacitor bank
Stores the DC power and provides ride-through protection for short power
losses.
6
Inverter section
Converts the DC voltage into a variable, controlled PWM AC output voltage to
the motor.
7
Motor output
Output to the motor being controlled.
8
Power card
•
Monitors input and motor current to provide efficient operation and control.
•
Monitors the user interface and performs external commands.
•
Can provide status output and control.
•
In a drive system, a ribbon cable links the power card to the MDCIC on the
control shelf. The MDCIC provides supervision over the drive modules in the
system.
Table 3.1 Single Drive Module - Simplified Block Diagram
Product Overview
VLT
®
Parallel Drive Modules
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