Connecting The Line Supply And Motor - Siemens SINAMICS G120 Operating Instructions Manual

4.4.2

Connecting the line supply and motor

Preconditions
Once the inverter has been properly installed, the line and motor connections can now be
established. The following warning information must be observed here.
Line and motor connections
The inverter must be grounded on the line supply and motor side. If the inverter is not
correctly grounded, this can lead to extremely hazardous conditions which, under certain
circumstances, can result in death.
The device must be disconnected from the electrical power supply before any connections
with the device are established or in any way altered.
The inverter terminals can be at hazardous voltages even after the inverter has been
switched off. After disconnecting the line supply, wait at least 5 minutes until the device has
discharged itself. Only then, carry out any installation and mounting work.
When connecting the inverter to the line supply, ensure that the motor terminal box is
closed.
Even if the LED or other indicators do not light up or remain inactive when a function is
switched from ON to OFF, this does not necessarily mean that the unit has been switched
off or is de-energized.
The short-circuit ratio of the power supply must be at least 100.
Make sure that the inverter is configured for the correct supply voltage (it is not permissible
that the inverter is connected to a higher supply voltage).
SINAMICS G120C Inverter
Operating Instructions, 01/2011, FW 4.4, A5E02999804A AB
WARNING
Installing
4.4 Connecting the inverter
33