SIEMENS
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Siemens D 31 · 2015
2
Highlights
Efficient Infeed Technology
■
Application
Whenever an application involves movements with frequent
changes in speed or rotational direction or requires masses to
be electrically braked, inverters with regenerative feedback
capability are an attractive drive solution for both operating
companies and machine manufacturers.
This is also true for applications with vertical motion generally,
or for driven loads with a high moment of inertia:
•
Drives for conveyor vehicles
•
Stage machinery in theaters
• Cranes
•
Heavy load transport systems/conveyors
•
Storage and retrieval machines
• Centrifuges
•
Brake testing systems
•
Drum-type crushers/revolving screens
•
Vertical load hoists
•
Industrial washing machines
•
Shuttles/elevator systems/endless bucket belts
•
Rolling mills/conveyor belts
•
Winding machines
Generally, for applications with a high braking power over long
periods of time, in many cases it makes sense to use Efficient
Infeed Technology - this reduces the costs and the amount of
space required.
■
Integration
SINAMICS infeed concepts
SINAMICS offers four design concepts for the inverter infeed
circuit.
Concept
Characteristic features
Basic Infeed
(only for multi-
axis drives)
• Automatic energy exchange via the common DC link
during infeed with Basic Line Module infeed unit
• No regenerative feedback capability
• Braking resistor required for braking operation
• High harmonic content (reactor available as option)
• Efficiency approx. 99 %
Smart Infeed
(only for multi-
axis drives)
•
Automatic energy exchange via the common DC link
•
Regenerative feedback capability
•
Line reactor is required
•
Efficiency approx. 98 % to 99 %
Efficient Infeed
•
Regenerative feedback capability
•
Line reactor not required/not permitted
•
Low harmonic component
•
Efficiency approx. 98 %
•
High energy efficiency and high active current
component
Active Infeed
(only for multi-
axis drives)
•
Automatic energy exchange via the common DC link
•
Regenerative feedback capability
•
Low harmonics in motor and generator operation
•
Efficiency approx. 97 % to 98 %
•
Operation on island networks possible
•
Operation on weak networks possible (
u
K
≤
5 %)
•
Boosting DC link voltage permits smaller power units
•
Decoupling from line voltage fluctuations due to
constantly controlled DC link voltage
© Siemens AG 2014