Purpose Of The Manual; Additional Resources; Product Overview; Internal Adjustable Frequency Drive Controller Functions - GE AF-650 GP Design And Installation Manual

Introduction

1.1 Purpose of the Manual

1 1
This manual is intended to provide detailed information for
the installation and start-up of the adjustable frequency
drive. provides requirements for mechanical and electrical
installation, including input, motor, control and serial
communications wiring, and control terminal functions.
provides detailed procedures for start-up, basic operational
programming, and functional testing. The remaining
chapters provide supplementary details. These details
include user interface, detailed programming, application
examples, start-up troubleshooting, and specifications.

1.2 Additional Resources

Other resources are available to understand advanced
adjustable frequency drive functions and programming.
•
The Programming Guide DET-618 provides greater
detail on working with parameters and many
application examples.
•
Optional equipment is available that may change
some of the procedures described. Reference the
instructions supplied with those options for
specific requirements. Contact the local GE
supplier or visit the GE website for downloads or
additional information.

1.3 Product Overview

An adjustable frequency drive is an electronic motor
controller that converts AC line power input into a variable
AC waveform output. The frequency and voltage of the
output are regulated to control the motor speed or torque.
The adjustable frequency drive can vary the speed of the
motor in response to system feedback, such as position
sensors on a conveyor belt. The adjustable frequency drive
can also regulate the motor by responding to remote
commands from external controllers.
In addition, the adjustable frequency drive monitors the
system and motor status, issues warnings or alarms for
fault conditions, starts and stops the motor, optimizes
energy efficiency, 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 communication
network.
1-8
TM
AF-650 GP Design and Installation Guide
1.4 Internal Adjustable Frequency Drive
Controller Functions
Figure 1.8 is a block diagram of the adjustable frequency
drive's internal components. See Table 1.7 for their
functions.
Figure 1.8 Adjustable Frequency Drive Block Diagram
Area
1
2
3
4
5
6
7
DET-767A
Title
•
Line power input Three-phase AC line power
supply to the adjustable
frequency drive
•
Rectifier The rectifier bridge converts
the AC input to DC current to
supply inverter power
•
DC bus Intermediate DC bus circuit
handles the DC current
•
DC reactors Filter the intermediate DC
circuit voltage
•
Provide line transient
protection
•
Reduce RMS current
•
Raise the power factor
reflected back to the line
•
Reduce harmonics on the AC
input
•
Capacitor bank Stores the DC power
•
Provides ride-through
protection for short power
losses
•
Inverter Converts the DC into a
controlled PWM AC waveform
for a controlled variable
output to the motor
•
Output to motor Regulated three-phase output
power to the motor
Functions