Auxiliary Power Supply Modules; General Information; Description - Siemens SINAMICS S120 Equipment Manual

5.8

Auxiliary Power Supply Modules

5.8.1

General information

Hazardous voltages are present in certain parts of this equipment during operation of the
cabinet unit.
Only qualified personnel may work on the cabinet.
Such personnel must be thoroughly familiar with all the warnings and maintenance
procedures for the cabinet described in the documentation provided.
The successful and safe operation of this cabinet is dependent on correct transport, proper
storage and installation, as well as careful operation and maintenance.
National safety regulations must be observed.
5.8.2

Description

Note
Refer to the layout diagrams and circuit diagrams provided on the enclosed customer CD for
the arrangement of components and interfaces, and for wiring.
Auxiliary Power Supply Modules supply power to the auxiliary voltage busbar system of the
SINAMICS S120 Cabinet Modules as well as to other external loads. Among other things,
the fans of the SINAMICS S120 devices installed in the Cabinet Modules are connected to
this busbar system. In addition, the auxiliary voltage busbar system supplies the electronics
modules with external 24 V DC. This is required when the DC link is not charged in order, for
example, to maintain PROFIBUS communication.
The 230 V AC power supply can also be fed in externally via an uninterruptible power supply
(UPS) and terminal -X46.
NOTICE
The same rated voltage must be fed into the supply infeed of the Auxiliary Power Supply
Module as for the connected Cabinet Modules, as the voltage fed into the Auxiliary Power
Supply Module supplies the entire system with auxiliary voltage via the auxiliary voltage
busbar system.
If a different voltage than that of the connected Cabinet Modules is fed in, there is a risk of
an insufficient energy supply to the device fans or too high a voltage, which can cause
damage to the system.
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A
DANGER
Cabinet Modules
5.8 Auxiliary Power Supply Modules
221