Coil Load; Motor Voltage And Type Of Circuit; Dimensioning Motor Cables - Siemens SINAMICS G180 Installation And Operating Instructions Manual

Electrical connection
6.6 Motor connection
6.6.2

Coil load

Note
Voltage increases due to switching flanks
The switching flanks in the voltage produced by the inverter also load the motor insulation.
Excess voltages occur.
If you observe the instructions in this section, voltage peaks at the motor of more than 1,560
V do not occur. Motors which are dimensioned for inverter operation therefore do not cause
any problems. If you would like to connect older motors or motors which are not suitable for
inverter operation, please consult the motor manufacturer.
Pay attention to the exact compliance with the peak voltage in the motor for explosion-protected
motors.
6.6.3

Motor voltage and type of circuit

Operate the motor as "star" or "delta" type of circuit according to the parameterization of the
inverter.
In most cases, the parameterized motor voltage on the inverter is identical to the mains voltage.
Check the parameter "P-MOTOR DATA/V-motor".
6.6.4

Dimensioning motor cables

● Voltage load
● Current load
● Use shielded mains power cables or cables with concentric protective earth conductor, type
Note the information in section "Correct EMC installation and connection" (Page 37).
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Use cables with at least U
– Dimension the cable cross section according to the applicable standards, e.g. VDE 0298.
– Determine the current of the motor cable according to the inverter output current which
you can find on the rating plate.
NYCWY, in order to comply with EMC directives.
/U = 0.6 kV/1 kV.
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Installation and operating instructions Sinamics G180
Operating Instructions, 05/2013, 4BS0751-001