Infeed - Siemens SINAMICS S120 Function Manual

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Infeed

Infeed units or Line Modules contain the central line infeed unit for the intermediate DC circuit.

Various Line Modules are available to address the various application profiles:

● Active Line Modules (ALM)

Active Line Modules can supply energy and return regenerative energy to the line supply.

A Braking Module and braking resistor are required only if the drives need to be decelerated

in a controlled manner after a power failure (i.e. when energy cannot be fed back to the

supply). For an infeed unit with an ALM, a line reactor or an Active Interface Module is

● Basic Line Modules (BLM)

Basic Line Modules are only suitable for infeed operation, i.e. they cannot feed regenerative

energy back into the grid. If regenerative energy accrues, e.g. when braking the drives, it

must be converted to heat via a Braking Module and a braking resistor.

● Smart Line Modules (SLM)

Smart Line Modules can supply energy and return regenerative energy to the line supply. A

Braking Module and braking resistor are required only if the drives need to be decelerated

in a controlled manner after a power failure (i.e. when energy cannot be fed back to the

supply). For an infeed unit with an SLM, the matching line reactor is required.

Parameter assignment

Line Modules are parameterized in the Startdrive engineering tool via the "Infeed" drive object.

Smart Line Modules 5 kW and 10 kW

Smart Line Modules of performance class 5 kW and 10 kW do not have DRIVE-CLiQ interfaces

and cannot be configured in the Startdrive engineering tool and in the STARTER

commissioning tool. The following information must be taken into consideration for the

commissioning of SLMs of performance class 5 kW and 10 kW:

● For communicating with the Control Unit, SLMs must be wired with a digital input of the

Control Unit via terminals.

● The recommended ON and OFF sequence for activating the SLMs must be adhered to.

You can find further information on the wiring of Smart Line Modules with the Control Unit and

for the recommended ON/OFF sequence in the Equipment Manual SINAMICS S120 Booksize

power units.

Drive functions

Function Manual, 06/2019, 6SL3097-5AB00-0BP2