SIEMENS
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Siemens D 35 · 2017
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Overview
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1
System overview
The SINAMICS drive family
Energy efficiency
Energy management process
Efficient energy management consultancy identifies the energy
flows, determines the potential for making savings and imple-
ments them with focused activities.
Almost two thirds of the industrial power requirement is from
electric motors. This makes it all the more important to use drive
technology permitting energy consumption to be reduced effec-
tively even in the configuration phase, and consequently to
optimize plant availability and process stability. With SINAMICS,
Siemens offers powerful energy efficient solutions which,
depending on the application, enable a significant reduction in
electricity costs.
Up to 70 % potential for savings using variable speed operation
SINAMICS enables great potential for savings to be realized by
controlling the motor speed. In particular, huge potential savings
can be recovered from pumps, fans and compressors which are
operated with mechanical throttle and valves. Here, changing to
variable-speed drives brings enormous economic advantages.
In contrast to mechanical control systems, the power consump-
tion at partial load operation is always immediately adjusted to
the demand at that time. So energy is no longer wasted, permit-
ting savings of up to 60 % – in exceptional cases even up to
70 %. Variable-speed drives also offer clear advantages over
mechanical control systems when it comes to maintenance and
repair. Current spikes when starting up the motor and strong
torque surges become things of the past – and the same goes
for pressure waves in pipelines, cavitation or vibrations which
cause sustainable damage to the plant. Smooth starting and
ramp-down relieve the load on the mechanical system, ensuring
a significantly longer service life of the entire drive train.
Regenerative feedback of braking energy
In conventional drive systems, the energy produced during
braking is converted to heat using braking resistors. Energy
produced during braking is efficiently recovered to the supply
system by versions of SINAMICS G and SINAMICS S drives with
regenerative feedback capability and these devices do not
therefore need a braking resistor. This permits up to 60 % of the
energy requirement to be saved, e.g. in lifting applications.
Energy which can be reused at other locations on a machine.
Furthermore, this reduced power loss simplifies the cooling of
the system, enabling a more compact design.
Energy transparency in all configuration phases
Early on, in the configuration phase, the SIZER for Siemens
Drives engineering tool provides information on the specific
energy requirement. The energy consumption across the entire
drive train is visualized and compared with different plant
concepts.
SINAMICS in combination with energy-saving motors
Engineering integration stretches beyond the SINAMICS drive
family to higher-level automation systems, and to a broad spec-
trum of energy-efficient motors with a wide range of performance
classes, which, compared to previous motors, are able to
demonstrate up to 10 % greater efficiency.
© Siemens AG 2017