Dc Link Options; Capacitor Module With 2.8 Mf, 4.1 Mf Or 20 Mf - Siemens 6SN1123-1AA00-0DA2 Configuration Manual

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05.01
6.7

DC link options

6.7.1

Capacitor module with 2.8 mF, 4.1 mF or 20 mF

Description
The capacitor modules are used to increase the DC link capacitance. This
means that on one hand, a brief power failure can be buffered and on the other
hand, it is also possible to store the braking energy.
A differentiation is made between the modules as follows:
S
S
The modules are available in the following versions:
S
S
The capacitor modules have a ready display; this is lit from a DC link voltage of
approximately 300 V and above. This also means that if an internal fuse rup-
tures, it can be identified. This does not guarantee safe and reliable monitoring
of the charge state.
The module with 2.8 mF or 4.1 mF is implemented without pre–charging circuit
and can – because it is directly connected to the DC link – absorb dynamic en-
ergy and therefore operate as dynamic energy storage device. For these mod-
ules, the charge limits of the line supply modules must be carefully taken into
consideration.
For the 20 mF module, the pre–charging is realized through an internal pre–
charging resistor; this is designed to limit the charge current and to de–couple
the module from the central pre–charging function. This module cannot dynami-
cally absorb any energy as the pre–charging resistor limits the charge current.
When the power fails (line supply failure), a diode couples this capacitor battery
to the system DC link so that it can be buffered by the capacitors.
Note
The capacitor modules may only be used in conjunction with the SIMODRIVE
611 line supply infeed units.
The central modules are suitable for internal and external cooling.
© Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
Modules with 2.8 mF and 4.1 mF ––> are used as dynamic energy storage
devices
Module with 20 mF ––> is used to buffer line supply dips
Central modules: 4.1 mF and 20 mF
– SIMODRIVE housing type – integrated into the system group.
Distributed modules: 2.8 mF and 4.1 mF
– New housing types are mounted decentrally in the control cabinet and
are connected to the SIMODRIVE DC link using an adapter terminal and
cable.
6 Infeed Modules
6.7 DC link options
6-183
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