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High-efficiency solutions for the pump
Reducing the speed of a pump to deliver
the required levels of flow or pressure
can result in significant energy savings.
While this statement is generally true and readily
accepted by the industry, those scrutinising
their return on investment and payback periods
have often found them to be much longer than
originally anticipated. Why?
Often overlooked is the fact that with any
reduction in pump speed and pump load, there
will also be a reduction in motor efficiency.
Power consumed throughout the speed range is
therefore higher than expected, thus extending
the payback period.
To address this very issue, WEG has further
developed its highly successful CFW11 ‘Optimal
Flux’ drives. The new technology allows WEG
motors to maintain high levels of efficiency,
irrespective of pump speed and load, thus
significantly improving return on investment.
Figure 1 demonstrates the efficiency gains
realised through the use of WEG motor and
Continuing to lead the way in energy-
efficient solutions, WEG understands that
many installations do not comprise variable
speed drives, and cannot benefit through the
application of the same. To that end, WEG offers
a full range of IE4 induction motors. These
deliver high efficiency and high-starting torque,
and unlike other IE4 motors on the market, they
are also suitable for direct on-line and soft-
For installations where super high levels of
efficiency are mandated, the ultimate energy-
efficient solution comes in the form of a WEG
WMagnet / CFW11 motor / drive package.
WMagnet is WEG’s latest range of permanent
magnet AC motors delivering IE5 efficiency
levels. By comparison to alternative technologies,
including switched and synchronous reluctance,
WMagnet delivers smoother operation, reduced
audible noise and reduced supply current draw,
as outlined in Figure 2.
Taking variable speed control of pumping
systems to the next level, WEG’s new pump
genius process control software enables users
to optimise their pumping systems so that they
run more efficiently and reliably.
The software is intended to reduce pumping
system operation and maintenance costs, while
increasing process accuracy and protection.
It works with WEG’s CFW11 series to control
system processes easily, providing multiple
pump control and protection. Pump genius can
be applied to any system that requires constant
flow or pressure, and can manage and monitor
up to six pumps in a coordinated system.
Using the software with pumps in parallel
increases the flexibility of the pumping system
in operation and implementation, while also
increasing the life span of the system. It
provides necessary flow according to the
pumping system demand, while allowing fault
diagnosis and facilitating the maintenance of
The software references low and high set
point and run time requirements, and the lead
and lag pumps are cycled on and off based
on motor run times. Pump genius software
monitors the operating hours of all of the
pumps in the system, adding and subtracting
pumps as demand changes, ensuring equal
pump run times without supervision.
Another key feature is the ability to have a
floating master and slave, rather than fixed
master and slave pumps found in traditional
systems. Pump genius automatically senses
if the master is not responding because of
sensor loss or other fault conditions, and assigns
another pump as the master, maintaining
operational continuity at all times during the
process. The transition between master drives is
seamless without disruption to the process, so
end users can be confident that their system is
operating reliably and efficiently.
The CFW-11 variable speed drive with pump
genius software also monitors and alarms
system, motor and drive faults, which will alert
the operator to a potential problem. The drives
are available in various sizes, from 1.1 to 370
kilowatts, and include proven user-friendly
Whether your key objectives are to increase
system efficiency, reduce operating and
maintenance costs, or to contribute to the
wellbeing of the environment by reducing
greenhouse gases, WEG has the products and
solutions to satisfy your needs.
Co-authored by Spiro Fkiaras and Leandro Mattedi, WEG Product Managers, Motors and Automation
330430E_WEG Australia | 2165.indd 1
17/04/15 1:08 PM
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