Connecting The Line Supply And Motor - Siemens SINAMICS G120 Operating Instructions Manual
Low voltage converters
built-in and wall mounting units with cu230p-2 control units
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- List manual (1256 pages) ,
- Manual (732 pages) ,
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4.4
Connecting the line supply and motor
Risk of electric shock and fire from a network with an excessively high impedance
Excessively low short-circuit currents can lead to the protective devices not tripping or tripping
too late, and so causing electric shock or a fire.
● In the case of a conductor-conductor or conductor-ground short-circuit, ensure that the
● You must use an additional residual-current device (RCD) if a conductor-ground short
Risk of electric shock and fire from a network with an impedance that is too low.
Excessively high short-circuit currents can lead to the protective devices not being able to
interrupt these short-circuit currents and being destroyed, and so causing electric shock or a
fire.
● Ensure that the uninfluenced short-circuit current at the line terminal of the inverter does
Electric shock when the motor terminal box is open
As soon as the inverter is connected to the line supply, the motor connections of the inverter
may carry dangerous voltages. When the motor is connected to the inverter, 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 inverter to the line supply.
Restrictions for installation altitudes above 2000 m
Above an installation altitude of 2000 m, the permissible line supplies are restricted.
Converter with the CU230P-2 Control Units
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE
WARNING
short-circuit current at the point where the inverter is connected to the line supply at least
meets the minimum requirements for the response of the protective device used.
circuit does not reach the short-circuit current required for the protective device to respond.
The required short-circuit current can be too low, especially for TT systems.
WARNING
not exceed the breaking capacity (SCCR or Icc) of the protective device used.
WARNING
Restrictions for special ambient conditions (Page 510)
4.4 Connecting the line supply and motor
Installing
83
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