SIEMENS
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Siemens D 21.4 · 2017
SINAMICS S120 drive system
System overview
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Overview
(continued)
Active Line Modules
Active Line Modules can supply energy and return regenerative
energy to the supply system. A Braking Module and braking resis-
tor are required only if the drives need to be decelerated in a con-
trolled manner after a power failure (i.e. when energy cannot be
recovered to the supply). In contrast to Basic Line Modules and
Smart Line Modules, however, Active Line Modules generate a
regulated DC voltage which remains constant despite fluctuations
in the line voltage. In this case, the line voltage must remain within
the permissible tolerance range. Active Line Modules draw a vir-
tually sinusoidal current from the supply which limits any harmful
harmonics.
In order to operate an Active Line Module, an Active Interface
Module with the appropriate rating must be used. A line filter can
be optionally installed in order to ensure compliance with the
limits stipulated for Category C2 in EN 61800-3.
For further information about configuring a drive system with
SINAMICS S120, refer to section configuration notes.
Power Modules, Motor Modules and Line Modules are available
in booksize, booksize compact, blocksize and chassis format:
•
Power Modules in blocksize and chassis formats,
•
Motor Modules and Line Modules in booksize, booksize
compact and chassis formats.
Cooling methods
There are two cooling options available depending on the type
of construction:
Internal air cooling
In this standard solution, the power loss from the electronics and
power units of the drive components is removed by natural cool-
ing or by a forced-ventilation system and routed to the interior of
the control cabinet.
Liquid cooling
For liquid-cooled devices in chassis format, the power semicon-
ductors are mounted on a heat sink through which the cooling
medium flows. Most of the heat produced by the unit is absorbed
by the cooling medium and can be dissipated outside the con-
trol cabinet.
Customized application
The devices can be purchased in the different formats as a com-
plete system solution. Users profit from the know-how of the drive
experts and need not spend valuable time calculating the thermal
design requirements of the application. Especially in applications
involving devices with liquid cooling in chassis format, users are
provided with a technically sound solution and can reduce their
engineering costs. The system solution extends up to complete
control cabinets with cooling system and temperature/conden-
sation control.
Further information is available on request.
Energy efficiency
The SINAMICS S120 drive system saves energy by recovering
energy from the axes and using it within the DC link group of a
multi-axis configuration and by feeding it back into the supply
system. Even at full infeed capacity, no unnecessary heat is
generated in the control cabinet. Because the Active Line
Modules prevent capacitive and inductive reactive currents,
SINAMICS
S120 also ensures that no unnecessary power losses
occur in the power supply and that no current harmonics occur.
This not only prevents detrimental effects on other loads, but
it also reduces the heat generated in the control cabinet.
System components
System components are divided into the following categories:
•
DC link components
e.g. Braking Modules and braking resistors
•
Output-end power components
e.g. motor reactors
•
Supplementary system components
e.g. Terminal Modules, Operator Panel and Communication
Boards
•
Encoder system interface
for connecting various encoder types to SINAMICS S120
. . .
Motor
Module
Active
Interface
Module
Active Line
Module
Switch disconnector
and fuses or
circuit-breaker
G_D211_EN_00035b
Line filter
M
3
=
G_D211_EN_00341
Internal
air cooling
Liquid
cooling
© Siemens AG 2017