Parallel Connection Of Basic Line Modules - Siemens SINAMICS S120 Function Manual

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Function modules

9.10 Parallel connection of power units

dokumentencenter/ld/Documentsu20Catalogs/lv-umrichter/sinamics-engineering-manual-lv-

6-pulse, 12-pulse infeed

When separate Control Units are used, pre-charging may not be synchronized accurately

enough, i.e. a converter system must be able to pre-charge the total capacity of the drive line-

up. Pre-charging power for the DC link in parallel operation must be dimensioned so that the

capacitance of the DC link can be fully charged by a single converter system. Otherwise a

separate pre-charging device must be provided.

Configuring a parallel connection

Additional information on configuring parallel power units connections can be found in the

"SINAMICS Low Voltage Configuration Manual

infocenter/dokumentencenter/ld/Documentsu20Catalogs/lv-umrichter/sinamics-engineering-

manual-lv-en.pdf)".

Parallel connection of Basic Line Modules

Basic Line Modules are used in cases where regenerative feedback capability is not required.

If regenerative operating states occur in the drive line-up, Braking Modules that convert the

excess energy to heat in braking resistors must be used.

Basic Line Modules in the Chassis format are available for the following voltages and power

Line voltage

38 to 480 V 3 AC

500 to 690 V 3 AC

Basic Line Modules have the following features and characteristics:

● The DC-link voltage is greater than the rms value of the line rated voltage by a factor of 1.35.

The following rules must be observed when connecting Basic Line Modules in parallel:

● Up to four identical Basic Line Modules can be connected in parallel.

● A common Control Unit must always be used to implement the parallel connection.

● Special Line Connection Modules are available for the parallel connection.

(http://www.automation.siemens.com/mcms/

200 to 710 kW

250 to 1100 kW

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

Drive functions