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Siemens CR 1 · 2015
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Overview
(continued)
Drive systems
SINAMICS S120 built-in devices
Active Line Modules
Active Line Modules can supply energy and return regenerative
energy to the supply system. Braking Modules and braking re-
sistors are required only if the drives need to be decelerated in
a controlled manner after a power failure – i.e. when energy can-
not be regenerated into the line supply. In contrast to Basic Line
Modules and Smart Line Modules, however, Active Line Modules
generate a regulated DC voltage which remains constant des-
pite fluctuations in the line voltage. In this case, the line voltage
must remain within the permissible tolerance range. Active Line
Modules draw a virtually sinusoidal current from the supply
which limits any harmful harmonics.
In order to operate an Active Line Module, it is absolutely essen-
tial to use the Active Interface Module for the appropriate rating.
A line filter can be installed optionally to restrict conducted inter-
ference to Class C2 limits (EN 61800-3).
Please refer to the System Description for more information
about designing a drive system with SINAMICS S120.
Power Modules, Motor Modules and Line Modules are available
in booksize, booksize compact, blocksize and chassis formats:
•
Power Modules in blocksize and chassis formats
•
Motor Modules and Line Modules in booksize,
booksize compact and chassis formats.
Cooling methods
Depending on the format, there are several cooling options for
crane applications:
SINAMICS S120 booksize, cooling methods
Internal air cooling
In this standard solution, the power loss from the electronics and
power units of the drive components is removed by natural coo-
ling or by a forced-ventilation system and routed to the interior of
the control cabinet.
External air cooling
External air cooling uses the "through-hole" method. The compo-
nents' power unit heat sinks pass through the mounting surface
in the control cabinet and can thus release the heat losses of the
power circuit to a separate external cooling circuit. The only heat
loss that remains in the cabinet is emitted by the electronics. De-
gree of protection IP54 can be achieved at this "mechanical in-
terface". The heat sink, with its cooling fins and the fan unit (part
of the scope of supply), protrudes through the back into a sepa-
rate ventilation area, which can also open outwards.
Cold-plate cooling
Units designed with cold-plate cooling can pass the power unit
heat losses to an external heat sink via a thermal interface on the
unit's rear panel. This external heat sink is water-cooled, for ex-
ample.
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 ge-
nerated 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
•
Load-side power components
e.g. motor reactors
•
Supplementary system components
e.g. Terminal Modules, Operator Panels and Communication
Boards
•
Encoder system interface
for connecting various types of encoders 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
=
internal
air cooling
external
air cooling
cold-plate
cooling
G_D211_EN_00303
© Siemens AG 2015