Commissioning The Parallel Connection - Siemens SINAMICS S120 Function Manual

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Function modules

9.10 Parallel connection of power units

Parallel connection (Chassis / Chassis-2) of two Active Line Modules and two Motor Modules on one

motor with a single winding system

In many cases, it is not possible to use motors with separate winding systems, for example, in

the following cases:

● The required number of separate winding systems cannot be realized due to the pole

● The motor is delivered by a third party.

● A motor with a common winding system is already present.

In such cases, the outputs of the Motor Modules connected in parallel are interconnected via

the motor cables in the motor terminal box.

Active Interface Modules isolate switching-frequency harmonics from the supply connection

and thus effect basic interference suppression of the supply system. These modules are

essential to the operation of Active Line Modules. The Voltage Sensing Module VSM10 also

helps Active Line Modules to operate without any disturbances when the line supply conditions

are unfavorable (e.g. significant voltage fluctuations, brief interruptions in the line voltage). For

ALMs in the Chassis and Chassis-2 formats, the VSMs are already integrated in the Active

Interface Modules.

Commissioning the parallel connection

During commissioning, power units connected in parallel are treated like one power unit on the

line or motor side.

In order to ensure the appropriate defaults for the circuit current controller, the type of winding

system must be configured in p7003.

Connecting Motor Modules in parallel in the Vector control mode

You have created an OFFLINE project in vector control with parallel-connected Motor Modules

and then transfer it ONLINE to the Control Unit (CU). To save the project in the CU, you must

perform a POWER ON. The next time you switch on you receive an error message that the

ONLINE topology is inconsistent. Load the project now to the programming device. This

resolves the inconsistency.

For further detailed information about commissioning, restrictions regarding operation and

parameterization options, please refer to the following manuals:

● SINAMICS S120 Commissioning Manual with Startdrive

● SINAMICS S120/S150 List Manual

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

Drive functions