Siemens SINAMICS G130 Engineering Manual page 282

SINAMICS S120 Cabinet Modules
Engineering Information
Cable installation conditions
Three-wire or four-wire cables should be used where possible to connect Motor Modules in parallel for the purpose of
increasing the output power rating. In this case, a specific clearance must be left between the cables of the individual
subsystems. The minimum clearance required is 50 mm. A three-phase system (U2, V2, W2) must be connected to
each 3-wire or 4-wire cable. Several motors can also be connected to one inverter output. However, as certain
restrictions regarding cable design apply, configurations of this must be individually checked (see chapter
"Fundamental Principles and System Description", section "Motor reactors").
If the application cannot accommodate the minimum required cable length specified above, an appropriate motor
reactor must be installed. Alternatively, motors with two electrically isolated winding systems can be used.
The latter option should be preferred for drives with higher power outputs as the motor terminal boxes may be subject
to current limitations in this case.
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Use of motor reactors
Please note the supplementary conditions applicable to parallel connections, such as the control of motors with only
one common winding system. These are described in the section "Parallel connections of converters" of the chapter
"Fundamental Principles and System Description".
SINAMICS Engineering Manual – May 2008
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© Siemens AG
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Use of asynchronous motors with two
electrically isolated winding systems