SIEMENS
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Siemens D 21.4 · 2017
SINAMICS S120 drive system
System overview
7
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Overview
(continued)
Motor Modules
A DC link and an inverter for supplying a motor are integrated in
the Motor Module.
CU320-2 Control Unit, Line Module and three Motor Modules in
booksize format
Motor Modules have been designed for multi-axis drives. Motor
Modules are interconnected by means of a shared DC busbar.
Since the Motor Modules share the same DC link, they can
exchange energy with one another, i.e. if one Motor Module
operating in the generator mode produces energy, the energy
can be used by another Motor Module operating in the motor
mode. The voltage-source DC link is supplied with mains voltage
by a Line Module.
Line Modules
Line Modules generate a DC voltage from the line voltage and
supply Motor Modules with energy via the voltage-source
DC link.
Basic Line Modules
Basic Line Modules are designed only for infeed operation, i.e.
they are not capable of recovering energy to the line supply. If
regenerative energy is produced, e.g. when drives brake, it must
be converted to heat by means of a Braking Module and a brak-
ing resistor. When a Basic Line Module is used as the infeed, the
matching line reactor must be installed. A line filter can be op-
tionally installed in order to ensure compliance with the limits
stipulated for Category C2 in EN 61800-3.
Smart Line Modules
Smart Line Modules can supply energy and return regenerative
energy to the supply system. A Braking Module and braking re-
sistor are required only if the drives need to be decelerated in a
controlled manner after a power failure (i.e. when energy cannot
be recovered to the supply). When a Smart Line Module is used
as the infeed, the matching line reactor must be installed. A line
filter can be optionally installed in order to ensure compliance
with the limits stipulated for Category C2 in EN 61800-3.
~
=
G_D211_XX_00043
Motor
Module
Line
Module
Control
Unit
=
~
M
3 ~
=
~
M
3 ~
DRIVE-CLiQ
M
3
=
G_D211_EN_00032a
Switch disconnector
and fuses or
circuit-breaker
Line
reactor
Line filter
Main
contactor
Basic Line
Module
Motor
Module
. . .
M
3
=
. . .
Motor
Module
Smart Line
Module
Line
contactor
Line
filter
Line
reactor
Switch
disconnector
and fuses
G_D211_EN_00033a
© Siemens AG 2017