Parallel Connection Of Motor Modules - Siemens SINAMICS S120 Function Manual

Function modules
9.10 Parallel connection of power units
9.10.1.4

Parallel connection of Motor Modules

Description
The following preconditions and rules must be observed when connecting Motor Modules in
parallel.
Requirements
The following power unit-specific preconditions apply when connecting Motor Modules in
parallel:
● Chassis or Chassis-2 format
● When commissioning Motor Modules in the Chassis-2 format, a firmware version of ≥ V5.2
must be available.
Rules and notes
The following rules and notes must be observed when connecting Motor Modules in parallel:
● In the Vector control mode, up to 4 Motor Modules in the Chassis format or 6 Motor Modules
in the Chassis-2 format can feed a motor in parallel operation. The motor can have
electrically isolated winding systems or a common winding system. The type of winding
system is set in p7003 (winding in a parallel connection), and influences the following setting
options:
– the required decoupling measures at the outputs of the Motor Modules connected in
– the possible modulation systems to generate pulse patterns
● In conjunction with the type of infeed, the modulation systems define the maximum
attainable output voltage or the motor voltage.
Winding systems for motors in SINAMICS S120 parallel connections
The following motors are permissible:
● Motors with electrically isolated winding systems (multi-winding system) in which the
individual systems are not electrically coupled.
● Motors with a common winding system (single winding system) in which all parallel windings
in the motor are interconnected in such a way that from the outside they look like a single
winding system.
The following are inadmissible:
● Motors with separate winding systems on the line side which have a common, internal
neutral.
Below are two examples illustrating the possible configuration of parallel connections of motors
with a two-winding system or single winding system.
526
parallel
Note
Operation of Motor Modules for separate winding systems
For separate winding systems, only one Motor Module may be operated per winding.
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Drive functions