Parallel Connection Of Smart Line Modules - Siemens SINAMICS S120 Function Manual

Function modules
8.10 Parallel connection of power units
Unexpected motion of individual drives
If several Motor Modules are supplied from one infeed unit, then if the V
incorrectly parameterized, individual drives can accelerate in an uncontrolled fashion -
which can lead to death or severe injury.
• Only activate the V
• Inhibit this function for all other Motor Modules, or set this function to monitoring only.
8.10.1.2

Parallel connection of Smart Line Modules

Smart Line Modules are infeed/regenerative feedback units. Like the Basic Line Modules,
they supply energy to the connected Motor Modules, but unlike the Basic Line Module, they
are capable of feeding back regenerative energy to the line supply.
The DC-link voltage is greater than the rms value of the line rated voltage by a factor of 1.3.
Smart Line Modules in chassis format are suitable for connection to grounded (TN, TT) and
non-grounded (IT) supply systems. The following voltages and power ratings are available:
Table 8- 10
Line supply voltage
380 to 480 V 3 phase AC
500 to 690 V 3-phase AC
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 must always be used to implement the parallel connection.
● A 4% reactor is always required upstream of each Smart Line Module for the purpose of
current balancing.
● Special Line Connection Modules are available for the parallel connection.
● With multiple infeeds, power must be supplied to the systems from a common infeed
point (i.e. the modules cannot be operated on different line supplies).
● A derating factor of 7.5% must be taken into consideration, regardless of the number of
modules connected in parallel.
566
WARNING
dc_max
moment of inertia.
Smart Line Modules
control for the Motor Module whose drive has the highest
Rated power
250 ... 800 kW
450 ... 1400 kW
dc_max
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
control is
Drive functions