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Medium Voltage Solutions for Water and Wastewater Treatment Medium Voltage
Solutions for
Water and
Wastewater
Treatment The application of Medium Voltage products in the Water/Wastewater
industry has increased dramatically in the last decade. Concerns with
reliability, downtime, peak demand energy costs and maintenance costs
have forced the industry to look at newer technologies to help meet the
challenges faced today. Solid state reduced voltage motor control
technology has advanced significantly over the past decade and now
offers more flexibility than traditional wound rotor or reduced voltage
autotransformer type solutions of the past. Variable frequency AC drives
have made advances in reliability to the point where significant energy
cost savings and process improvements are now possible. The right
supplier can provide project management, a complete line of medium
voltage products and coordination with the pump vendor to facilitate a
lower initial capital cost and long-term operating cost. A medium voltage
solution by Rockwell Automation can also be tested at the factory at rated
load and voltage to help reduce installation and commisioning costs.
Potential reduction in energy costs
Increased reliability and up-time
Reduced maintenance costs
Enhanced control of water flow
Improved process control
Remote monitoring and diagnostics
Project management
Early involvement with consultants
to ensure compliance with the
project specification
Close coordination with pump OEM,
motor manufacturer, and contractor
On-time submittal of documentation
package
Water/Wastewater industry-specific
consultants on staff
Common spare parts across all
Medium Voltage control equipment
Witness testing
(at full load and voltage) with or
without customer - supplied motor
Water/Wastewater treatment plants
reduce maintenance costs, energy
charges and ensures reliability with
Medium Voltage solutions.
What you want from your
Medium Voltage solution Fixed speed applications
Wherever you need fixed speed control of medium voltage
induction or synchronous motors there is an Allen-Bradley
CENTERLINE
®
controller to fit your needs. Many MCCs
contain a wide array of intelligent electronic devices such
as Bulletin 825P programmable motor protection, and
IntelliVAC control modules. The IntelliCENTER
®
motor
control center is equipped to take full advantage of these
new technologies and provide you with built-in
communications, monitoring software and intelligent
devices in a cost-effective package. Selected CENTERLINE
controllers can be provided in an arc resistant enclosure
when compliance with IEEE C37.20.7 (Type 2) is required.
Solid state reduced voltage applications
Reduce water hammer for constant speed pumping applications
by applying the Allen-Bradley medium voltage SMC Flex
TM
controller with pump control option.This reduced voltage, solid
state controller has a patented pump control algorithm that helps
minimize excess torque delivered to the pump virtually
eliminating water hammer. The SMC-Flex is ideally suited for
applications that require soft starting and stopping of motors that
do not require speed control. The medium voltage SMC-Flex
controller is equipped with a bypass contactor that shorts out the
SCR stack once the motor is up to speed. The SMC-Flex can also
be used as a bypass controller in conjunction with the
PowerFlex
®
7000 AC drive in a synchronous bypass scheme. This
provides you with smooth reduced voltage starting and stopping
when the variable frequency drive is not available.
Choose the right solution for your application Variable speed applications
Variable frequency drives offer a number benefits to the
Water/Wastewater industry. Applying medium voltage drives to pumping
and blower applications helps reduce power consumption and increases
flow control capability. The PowerFlex 7000 medium voltage variable
frequency drive with Direct-to-Drive
TM
technology provides you with a
solution to fit your specific needs. Direct-to-Drive technology allows you
to connect utility power directly to the drive without an isolation
transformer. It also allows you to connect both new and existing motors
directly to the drive, eliminating unnecessary motor filtering. Direct-to-
Drive technology offers you the lowest-cost solution and reduced size
and weight, while eliminating common mode voltage and remaining
compliant to the worlds most accepted harmonic standards.
Synchronous transfer bypass systems
During any given day, demand for water can change significantly. With synchronous transfer bypass
systems, one variable frequency drive can be used in conjunction with multiple motors to adjust the
flow to meet this demand. When the capacity of a pump is exceeded, the load is transferred from a
variable frequency bus to a fixed frequency bus by matching the voltage waveform frequency,
amplitude and phase relation between the two sources. The synchronous transfer bypass system is
more energy efficient than multiple drives and has the additional benefits of helping to prevent voltage
drop, vibration problems or process disturbances. CENTERLINE
®
Medium Voltage
Motor Control
A complete line of induction and synchronous controllers now
integrated with the intelligence of solid state technology
MV SMC-Flex Smart Motor Controller
Allen-Bradley MV SMC-Flex controllers apply reduced voltage to an AC motor to allow soft starting
and stopping, limit inrush current, and reduce effects of water hammer in pumping systems.
Allen-Bradley SMC-Flex controllers include communication and diagnostic capabilities and high
fexibility, making it ideal for virtually any Water/Wastewater application.
PowerFlex 7000 AC Drive
Allen-Bradley Medium Voltage Drives provide a single solution for all
medium voltage speed control requirements. The PowerFlex 7000 family of
drives exceeds industry expectations by delivering superior reliability, ease of
use and lower total cost of ownership. The advanced power semiconductor
technology reduces component count to the lowerst of any medium voltage
drive available, translating to increased savings and reliability, less
downtime and fewer spare parts.
Full Voltage Non-Reversing
Full Voltage Reversing
Two-Speed
Reduced Voltage Autotransformer
Reduced Voltage Reactor
Brush Type Synchronous
Brushless Type Synchronous
Incoming Line Units
Fused & Non-Fused Load
Break Switches
ArcShield
TM
Controllers
IntelliCENTER
TM
Controllers The medium voltage test facility at Rockwell Automation allows for testing MV SMCs and Drives at rated load and voltage. SMC
products are fully tested under load simulating the intended application. Drives can be tested at a variety of voltage and rectifier styles,
including 18 pulse and PWM rectifier, on 200 hp up to 6000 hp at voltages from 2300 to 6900 volts. The facility includes a new
dynamometer (the motor and drive arrangement used for load testing) mounted on a 40 foot long T-slot base. It consists of two 2500 hp
induction motors (3810/6600 volts) and one 5500 hp induction motor at 4160 volts. One of the motors is removable so that customers can
bring their own motor (up to 8000 hp) for combined drive/motor testing.
www.rockwellautomation.com
Power, Control and Information Solutions Headquarters
Americas: Rockwell Automation, 1201 South Second Street, Milwaukee, WI 53204-2496 USA, Tel: (1) 414.382.2000, Fax: (1) 414.382.4444
Europe/Middle East/Africa: Rockwell Automation SA/NV, Vorstlaan/Boulevard du Souverain 36, 1170 Brussels, Belgium, Tel: (32) 2 663 0600, Fax: (32) 2 663 0640
Asia Pacific: Rockwell Automation, Level 14, Core F, Cyberport 3, 100 Cyberport Road, Hong Kong, Tel: (852) 2887 4788, Fax: (852) 2508 1846
Publication MVW-BR001A-EN-P September 2005

Copyright © 2005 Rockwell Automation. All rights reserved. Printed in Canada.
Medium Voltage testing
at rated load and voltage