Parallel Connection Of Power Units - Siemens SINAMICS S120 Function Manual

Function modules

7.10 Parallel connection of power units

7.10 Parallel connection of power units
In order to extend the power range, SINAMICS S120 supports the parallel connection of
identical power units such as Line Modules and/or Motor Modules. The prerequisites for
connecting power units in parallel are as follows:
● Same type
● Same type rating
● Same rated voltage
● Same firmware version
● Chassis or cabinet format
● The Motor Modules must be operated in vector control
It makes sense to connect Line Modules and Motor Modules in parallel for the following
reasons:
● To boost the converter output if it is not technically or economically feasible to achieve
● To increase the availability, for example, to maintain emergency operation (possibly also
Parallel operation is not released under the following conditions:
● Combining different types of Infeed Module within the same parallel connection (e.g.
● Motor Modules in servo control
● Infeed Modules and Motor Modules in the booksize and blocksize formats
Features
The main features of parallel connection are:
● Parallel connection of up to four Motor Modules on one motor
Note
Additional information and instructions in the Manual SINAMICS S120 Chassis Power
Units must be carefully taken into consideration.
● Parallel connection of up to four power units on the infeed side (closed/open loop).
502
the required power by any other means.
at a lower rating), if a power unit fails.
Basic Line Modules with Smart Line Modules or Basic Line Modules with Active Line
Modules).
– Parallel connection of multiple Motor Modules on one motor with separate winding
systems (p7003 = 1).
Note
Motors with separate winding systems are recommended.
– Parallel connection of multiple Motor Modules on one motor with a single winding
system (p7003 = 0) is possible.
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Drive functions