Siemens SINAMICS S120 Manual page 122

Line Modules
3.3 Smart Line Modules
Parallel connection of Smart Line Modules to increase power rating
Up to four Smart Line Modules with the same power rating can be connected in parallel in
order to increase power.
The following rules must be observed when connecting Smart Line Modules in parallel:
● Up to four identical Smart Line Modules can be connected in parallel.
● A common Control Unit is required whenever the modules are connected in parallel.
● With multiple infeeds, power must be supplied to the systems from a common infeed
● A line reactor must be series-connected to every parallel-connected Smart Line Module.
● A derating factor of 7.5% must be taken into consideration, regardless of the number of
Note
Mixed operation is not possible
It is only possible to connect identical power units in parallel if all power units have the same
hardware version. Mixed operation between a power unit with Control Interface Module
(order number 6SL33xx-xxxxx–xAA3) and a power unit with Control Interface Board (order
number 6SL33xx-xxxxx–xAA0) is not possible.
Circuit breaker wiring
The signal from the leading contact of the circuit breaker must be interconnected to the
OFF2 signal from the Control Unit. In this way, the SINAMICS control is able to delete
pulses from the Smart Line Modules in good time, before the circuit breaker is opened.
Otherwise, the SINAMICS control would react with an overvoltage or undervoltage error
message when the circuit breaker is triggered.
120
point (i.e. different supply systems are not permitted).
modules connected in parallel.
CAUTION
Manual, (GH3), 01/2013, 6SL3097-4AE00-0BP3
Chassis power units