Overview Of Devices Required For Operation; General; Line Disconnection Devices; Overcurrent Protection By Line Fuse Or Circuit-Breaker - Siemens SINAMICS S120 Equipment Manual

Cabinet Design and EMC

7.4 Overview of devices required for operation

The shielding between the motor and the Power Module or Motor Module must not be
interrupted by additional components (e.g. fuses, contactors, reactors, or filters).
Automation devices and SINAMICS S120 devices should be connected to different power
supply networks. If only a joint supply is available, the automation devices used should be
isolated from the supply by means of isolating transformers.
Devices for controlling and monitoring the drives should be set up separately. A separate
cabinet that is separated from the drive cabinet by means of a partition is recommended
here. If this is not possible, suitable steel plates can be used.
7.4 Overview of devices required for operation
7.4.1

General

The following components are required for connection to the power supply network:
• Line disconnecting device
• Line fuse
• Line contactor (required with electrical isolation)
• Line reactor (for Power Module and Basic Line Module; see section 2.1 and 2.2)
7.4.2

Line disconnection devices

A line disconnecting device for the electrical equipment may be used for correct isolation of
the drive line-up from the power supply. This line isolation device must be for electrical
equipment of machinery in conformance with the requirements of EN 60204-1, Section 5.3.
The relevant technical specifications of the devices used must be taken into account during
selection. All consumers of the electrical equipment that are located downstream of the line
disconnecting devices must be included in the selection.
7.4.3

Overcurrent protection by line fuse or circuit-breaker

The cables for the drive line-up power supply must be protected against overcurrents. NH, D,
and DO-type fuses with a gL characteristics or suitable circuit-breakers can be used for this
purpose.
7.4.4

Line contactor

Line contactors are required to provide electrical isolation between the drive line-up and the
line supply.
For selection of the line contactor, the characteristic values in the technical specifications
apply. The cable routing, the bundling factor, and the factor for the ambient temperature
according to EN 60204-1 must be taken into account when the conductors to be connected
are rated.
Caution
Line contactors must not be switched under load.
To limit the opening overvoltage, the contactor coils should be connected to an overvoltage
limiter (e.g. flywheel diode or varistor).
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SINAMICS S120 Equipment Manual, Edition 04/2007, 6SL3097-2AM00-0BP2
Chassis Power Units Liquid Cooled