Siemens SINAMICS S120 Manual page 91

Components of the Basic Infeed
A Basic Infeed comprises a Basic Line Module and an external line connection, which
comprises a line filter and a line reactor.
Operating principle
One or more Motor Modules can be connected to the power supply network via the Basic
Line Module. The Basic Line Module provides the DC-link voltage for the Motor Modules.
The Basic Line Module is suitable for direct operation both on TN and on IT and TT systems.
Parallel connection of Basic Line Modules to increase power rating
Up to four Basic 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 Basic Line Modules in parallel:
● Up to four identical Basic 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 Basic Line Module.
● The upstream line contactors of the individual precharging circuits must switch-on jointly
● A derating factor of 7.5% must be taken into consideration, regardless of the number of
The following rules must be observed when connecting Basic Line Modules of frame size GD
in parallel:
● Each Basic Line Module must be precharged via a separate precharging circuit.
● The circuit breakers of the respective precharging circuits must switch-on jointly and
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.
Chassis power units
Manual, (GH3), 01/2013, 6SL3097-4AE00-0BP3
point (i.e. different supply systems are not permitted).
and simultaneously.
modules connected in parallel.
simultaneously; this can be performed via a monitoring function of the circuit breaker
feedback signals.
Line Modules
3.2 Basic Line Modules
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