Auxiliary Power Supply System; General Information - Siemens SINAMICS S120 Manual

4.6.5

Auxiliary power supply system

4.6.5.1

General information

Availability
To facilitate the auxiliary voltage supply to S120 Cabinet Modules, the individual modules are
fitted with a special, standardized auxiliary voltage supply system. This system is delivered
pre-installed. The cabling required from the auxiliary power module into the relevant Cabinet
Module are factory-installed.
In the following S120 Cabinet Modules, two further voltage taps are available to the
customer on the auxiliary power module for each voltage level:
● Smart Line Modules
● Active Line Modules
● Booksize Base Cabinets
● Motor Modules in chassis format
● Central Braking Modules
Description
The auxiliary power supply system installed in the Cabinet Module is used to distribute the
voltages provided by an auxiliary power supply.
Ideally, these voltages are generated by an Auxiliary Power Supply Module. Other ways to
supply power is to use option K76 "Auxiliary voltage generating unit in the Line Connection
Module" or to feed the auxiliary voltages to the auxiliary power supply system from an
external source.
The maximum load capability of the auxiliary power supply system is 80 A. If the total power
requirement of the cabinet line-up exceeds the maximum load capability, the auxiliary power
supply system must be divided into segments and several infeed points selected.
The following diagram shows the mechanical design of the auxiliary power supply system.
The standard assignment with the three auxiliary voltages is shown in the tables below.
Cabinet Modules
Manual, 03/2013, A5E03263538A
Electrical installation
4.6 Connections
81