Danfoss VLT FC Series Service Manual page 45

Internal Drive Operation
1
Area Title
1 Mains input
2 Input rectifier section
3 Intermediate DC bus section
4 DC reactors
5 Capacitor bank
6 Inverter section
7 Motor output
8 Control
Illustration 5.1 Drive Module Basic Block Diagram
MG94A502
Service Guide
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3
4
8
Functions
Provides 3-phase AC mains power input to the drive module.
Converts mains input AC voltage into DC voltage.
Acts as a filter and stores energy in the form of DC voltage.
•
Filter the DC-link voltage.
•
Reduce RMS current.
•
Raise the power factor reflected back to the line.
•
Reduce harmonics on the AC input.
Stores the DC power and provides ride-through protection for short power
losses.
Converts the DC voltage into a variable, controlled PWM AC output voltage to
the motor.
Sends output to the motor being controlled.
•
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.
•
Includes the power card, fan power card (in E-sized drives only), and inrush
card.
•
In a parallel 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.
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