Tech Briefs Magazine - June 2022 - MD-11

MD Fluid Line Products Ad 0622.qxp_1/3 Page Ve
1,800 rpm with no flow from the system
requires several kW of wasted energy.
This method of operation creates many
subsequent problems, including higher
energy costs and excess heat production
that must be controlled using cooling or
other dissipation methods (requiring
even more energy).
Variable-speed systems create harmony
by using electronic speed control
of a motor and pump so that the energy
output is adjusted to match the demands
and conditions of the operation. By reducing
the speed 40 percent to 70 percent
under partial-load conditions and
accounting for no-load conditions, variable-speed
HPUs have demonstrated energy
savings up to 80 percent when
compared to their fixed-speed counterparts.
Lower, more controlled operating
speeds also reduce the unit's heat output,
allowing it to run cooler and reduce
or eliminate the need for additional
cooling measures, as well as their associated
costs.
Takeaway: When compared to
cess to performance and usage reports
24/7 via dashboards on a mobile
device.
With some older HPUs, connectivity is
still an option, but it is one that can
come with many challenges and costs. In
these cases, it is important to calculate
these costs and compare them to the
cost of replacement with a modern,
i4.O-ready HPU.
Takeaway: Consider how your operation
might benefit from HPU data and compare
the cost of retrofitting an older HPU with data
sensors to the cost of replacing it with a new
plug-and-play model equipped with an integrated
sensor package and open interfaces.
equally
sized fixed-speed HPUs, variable-speed HPUs
run cooler and are up to 80 percent more
energy-efficient.
4. Connectivity: Many manufacturers
struggle with decisions between replacing
outdated equipment or retrofitting
older components to bring them into
the modern age of IoT. Although incorporating
data-gathering capabilities is
essential to reducing maintenance costs,
improving productivity and protecting
uptime, deciding how to do that can be
overwhelming.
Whether adding sensors to your older
HPU or opting for a new plug-and-play
model, the data that can be collected is
invaluable to critical manufawcturing
functions such as productivity, troubleshooting
and predictive maintenance.
With a modern HPU, access to cloudbased
diagnostics and data analytics
tools also streamlines workflows and reduces
the demand on personnel (especially
less-experienced employees) to
commission new equipment or capture
critical data to troubleshoot equipment
in person.
Some companies like Bosch Rexroth
offer sensor package options that include
case drain flow/temperature,
particle counter, energy consumption,
pump damage and other monitoring
parameters, with real-time acMotion
Design, June 2022
5. Total Cost of Ownership: The belief
that nothing costs less than the
equipment a manufacturer already
owns is misleading, and good data
often demonstrates that the opposite is
closer to the truth. While many older,
fixed-speed HPUs can be outfitted with
sensors and adapted for modern manufacturing
and IoT, their energy usage
remains inefficient and unchanged.
They also still take up the same large
amount of space on the factory floor,
and they are still noisy. Comparatively,
investing in a new, compact variable-speed
HPU like the CytroBox can
immediately reduce noise, free up
space on the manufacturing floor for
other profit-producing equipment and
lower energy costs by operating more
efficiently.
Takeaway: Modern variable-speed HPUs
may be more of an investment upfront, but
manufacturers with high energy costs driven
by fixed-speed HPUs will see more value and
a faster return on their investment with energy
savings.
Final Takeaway
Choosing to maintain older fixedspeed
HPUs or investing in new variable-speed
HPUs depends on many factors
within a manufacturing environment,
including capital expenditures,
lean maintenance goals, and carbon-reducing
initiatives. New HPUs should be
considered for any operation that is
seeking IoT-ready solutions that lower
energy costs and reduce noise, as well as
open up space on the factory floor.
This article is written by Tyler Stahl,
Application Engineer, Bosch Rexroth Corp.
(Bethlehem, PA). For more info visit
http://info.hotims.com/82322-280.
Free Info at http://info.hotims.com/82322-705
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Tech Briefs Magazine - June 2022

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