Commissioning - Siemens SINAMICS S120 Function Manual

Parallel connection of two Active Line Modules and two Motor Modules on a 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 a third-party motor
● 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 VSM10 Voltage Sensing Module also
helps Active Line Modules to operate properly when mains power conditions are less than
ideal (e.g. severe voltage fluctuations, brief interruptions in the line voltage). VSMs are
integrated as standard in the Active Interface Modules for Active Line Modules in chassis
format.
7.10.2

Commissioning

During commissioning, power units connected in parallel are treated like a power unit on the
line or motor side.
Note
Parallel connection of Motor Modules in vector control
You have an offline project in vector control with parallel-connected Motor Modules and then
transfer it online to the Control Unit. To save the project in the Control Unit, 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 references
● SINAMICS S120 Commissioning Manual
● SINAMICS S120/S150 List Manual Parameters r7002 ff.
Drive functions
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
number
Function modules
7.10 Parallel connection of power units
513