1.3 Additional Resources
Other resources are available to understand advanced
frequency controller functions and programming.
•
The Programming Guide, MG.04.GX.YY, provides
greater detail in how to work with parameters and
many application examples
•
The Design Guide, MG.04.HX.YY, is intended to
provide detailed capabilities and functionality to
design motor control systems.
•
Training courses both on-line and in person.
•
Phone and on-line help.
•
Installation, set up, and commissioning is also
available by Danfoss trained and approved
installers.
•
Danfoss sales representatives are also trained to
provide customer service and instruction for
applications
Contact your Danfoss supplier or go to www.Danfoss.com for
downloads or additional information.
1.4
Product Overview
A frequency converter is an electronic motor controller that
converts AC mains input into a variable AC waveform output.
The frequency and voltage of the output are regulated to
control the motor speed or torque.
In addition, the frequency converter monitors the system
and motor status, issues warnings or alarms for fault
conditions, starts and stops the motor, optimizes energy
efficiency, provides line harmonics protection, and offers
many more control, monitoring, and efficiency functions.
Operation and monitoring functions are available as status
indications to an outside control system or serial communi-
cation network.
The FCD 302 designed for decentral mounting, e.g. in the
food and beverage industry, or for other material handling
applications. With the FCD 302 it is possible to utilize the
cost saving potential by placing the power electronics
decentrally, and thus make the central panels obsolete
saving cost, space and effort for installation and wiring. The
basic design with a plugable electronic part and a flexible
and “spacious” wiring box is extremely service-friendly, and it
is easy to change electronics without the need for unwiring.
The FCD 302 is a part of the VLT
®
frequency converter family,
which means similar functionality, programming, and
operating as the other family members.
1.5
Internal Frequency Converter Controller
Functions
Below is a block diagram of the frequency converter's
internal components. See Table 1.1 for their functions.
Illustration 1.1 Frequency Converter Block Diagram
Area Title Functions
1 Mains input Three-phase AC mains power supply to the
frequency converter.
2 Recifier The rectifier bridge converts the AC input to
DC current for use within the frequency
converter.
3 DC bus The frequency converter's intermediate DC-
bus circuit handles the DC current for internal
routing.
4 DC line
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
5 Capacitor
bank
•
Stores the DC power
•
Provides a regulated DC current supply
•
Provides ride-through protection for short
power losses
6 Inverter The inverter converts the DC into a controlled
PWM AC waveform for a controlled variable
output to the motor.
7 Output to
motor
By controlling the voltage and frequency, the
frequency converter provides regulated motor
control from 0-50/60 Hz at 100% supply
voltage.
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
Table 1.1 Frequency Converter Internal Components
Introduction
VLT
®
Decentral Drive FCD 302 Operating Instructions
4 MG.04.F2.02 - VLT
®
is a registered Danfoss trademark
11
