4.9 Connect the line supply, motor and braking resistor
WARNING
Electric shock when the motor terminal box is open
As soon as the converter is connected to the line supply, the motor connections of the converter
may carry dangerous voltages. When the motor is connected to the converter, there is danger
to life through contact with the motor terminals if the motor terminal box is open.
• Close the motor terminal box before connecting the converter to the line supply.
Note
Fault protection when insulation fails in the motor circuit at the output side
In case of insulation failure in the motor circuit, the overcurrent trip of the converter meets the
requirements of IEC 60364-4-41:2005/AMD1:2017 Section 411 and Annex D for protection
against electric shock.
• Observe the installation specications for this converter.
• Ensure the continuity of the protective conductor.
• Observe the applicable installation standards.
4.9.1 Permissible line supplies
The converter is designed for the following line supplies according to IEC 60364-1 (2005).
• TN system
• TT system
• IT system
General requirements on line supply
The plant builder or machine manufacturer must ensure for operation with rated current
I
rated
that the voltage drop between the transformer input terminals and the converter when
operated with its rated values is less than 4% of the transformer rated current
Restrictions for installation altitudes above 2000 m
Above an installation altitude of 2000m, the permissible line supplies are restricted.
Restrictions for special ambient conditions (Page432)
Installing
4.9Connect the line supply, motor and braking resistor
SINAMICS G120C Converters
64 Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK
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