SIEMENS
15
Integrated energy-saving functions
Recovering braking
energy
Energy savings of up to 70% can be obtained by recovering the braking energy. It simplifies
system cooling and allows a more compact design.
Energy balancing
in the DC link
For coupled drives, the power loss in the overall system can be minimized using energy balancing
along the common DC bus.
Storing excess
energy
Transient power peaks can be covered and flicker avoided by using additional capacitors in the
DC link. As a result, regenerative energy is stored rather than wasted in the form of heat.
Automatic
adaptation of
the operating point
In the ECO mode, the motor operating point in the partial load range is automatically adapted
and optimized. This allows motor losses to be reduced.
Energy-saving
when idle
If variable-speed drives are only temporarily used, then they can be switched into the hibernation
mode. Depending on the demand, the drive is automatically reactivated.
Reducing the
power loss
In the bypass mode, the converter can be electrically bypassed as soon as the motor is frequently
operating in the range of its rated speed. This means that converter losses can be avoided and the
overall efficiency increased.
Cascading drives
If, in applications, the power demand is distributed over several motors, the energy demand can
be optimized by switching-in and switching-out these motors in stages using partially or fully
controlled cascades in conjunction with converters and motor starters.
Optimized
pulse pattern
As a result of the optimized clock frequency and pulse pattern, SINAMICS G and S converters are
perfectly harmonized and coordinated with SIMOTICS motors. The advantages: optimized operating
response and system efficiency, lower system losses as well as lower temperature rise and noise.
Reactive power
compensation
The capacitive and/or inductive reactive power in the machine is reduced by using SINAMICS
converters with Active Line Modules. This means that expensive reactive power compensation
systems can be eliminated.
Energy-saving meter/
energy usage meter
The energy usage in operation is measured. Using the energy-saving meter, the energy saved is
cumulated over the operating hours and output in comparison to a fixed-speed application.
DC link
coupling with
SINAMICS V20
Applications that use SINAMICS V20 drives with the same power rating can share a common DC bus
to reuse the regenerative energy.
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