Connecting The Line Supply, Motor, And Inverter Components; Tn Line System - Siemens SINAMICS G120 Operating Instructions Manual
Low voltage converters
chassis devices with cu240b-2 and cu240e-2
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Also See for SINAMICS G120:
- List manual (1256 pages) ,
- Manual (732 pages) ,
- Operating instructions manual (550 pages)
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4.4
Connecting the line supply, motor, and inverter components
Danger to life through electric shock as well as fire hazard due to protective devices that either
do not trip or trip too late
Overcurrent protective equipment that trips too late or not all can cause electric shock or fire.
● In the case of a conductor-conductor or conductor-ground short-circuit, ensure that the
● You must additionally use a residual-current protective device (RCD) if, for a conductor-
● It is not permissible that the short-circuit current exceeds the SCCR or the I
Danger to life as a result of a hazardous voltage at the motor connections
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 terminal box is open.
● Close the terminal box of the motor 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.
4.4.1
TN line system
A TN line system transfers the PE protective
conductor to the installed plant or system us‐
ing a cable.
Generally, in a TN line system the neutral
point is grounded. There are versions of a TN
system with a grounded line conductor, e.g.
with grounded L1.
A TN line system can transfer the neutral con‐
ductor N and the PE protective conductor ei‐
ther separately or combined.
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2017, FW V4.7 SP6, A5E34259001B AD
WARNING
short-circuit current at the point where the inverter is connected to the line supply
corresponds as a minimum to the requirements of the protective equipment used.
ground short circuit, the required short-circuit current is not reached. Especially for TT line
systems, the required short-circuit can be too low.
and the disconnecting capacity of the protective equipment.
DANGER
Restrictions for special ambient conditions (Page 474)
4.4 Connecting the line supply, motor, and inverter components
Installing
of the inverter
CC
69
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