Auxiliary Voltage Distribution - Siemens SINAMICS G130 Engineering Manual

SINAMICS S120 Cabinet Modules
Engineering Information

Auxiliary voltage distribution

To simplify the auxiliary voltage supply to S120 Cabinet Modules, the individual modules are fitted with a special
busbar system. This auxiliary voltage busbar is ready fitted and wired in the delivered units and the necessary
connections from this busbar into the relevant cabinet are pre-assembled.
The standard busbar assignments are as follows:
Busbar Voltage
1 and 2 Line voltage (2 phases for fan supply via transformer)
- for 380 V – 480 V 2AC: 380 V to 480 V
- for 500 V – 690 V 2AC: 500 V to 690 V
3-4 230 V AC e.g. for distribution to circuit breaker, Booksize Base Cabinet
5-6 24 V DC for electronics power supply
The existing busbars in the individual modules can be interconnected by means of special busbar links supplied with
the modules.
The busbar is fitted with Faston terminals throughout. The busbar Infeed can be connected by means of special
Infeed plugs or with standard Faston connectors. Infeed plugs rated to match the current of the auxiliary voltage
busbar are supplied with the Line Connection Module, but can also be ordered separately.
Voltages to supply additional components mounted in the cabinet can be picked off at any point along the busbar.
Connectors, usually of the standard Faston type, can also be used for this purpose. In this case, separate fuse
protection for the pick-off must be provided.
The voltages on the auxiliary voltage busbar must be provided by an external auxiliary power supply. The Auxiliary
Power Supply Module is one possible source. The maximum load rating of the busbar is 100 A (80 A UL). If the total
power requirement exceeds the maximum load rating, it is advisable to split the busbar line into segments and select
additional Infeed points.
The auxiliary voltage busbars are available in the following cabinet types:
•
Smart Line Modules
•
Active Line Modules
•
Booksize Base Cabinet
•
Motor Modules Chassis format
•
Central Braking Modules
•
Auxiliary Power Supply Modules
Cabinet Modules without an auxiliary voltage busbar are either supplied with cables for connecting to busbars in
adjacent cabinets or feature the appropriate interfaces. The selection is function-dependent, i.e. a busbar where
general disconnection of the auxiliary voltage is required, or a terminal if the preferred option, for example, is to
supply the auxiliary voltage separately via an emergency power supply. It is, of course, always possible to connect a
terminal to the auxiliary voltage busbar.
SINAMICS Engineering Manual – May 2008
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