Siemens SINAMICS G120P, Operating Instructions Manual

Page: 65 / 496

Electrical installation
4.6 Power connections
Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A
65
NOTICE
Material damage due to loose power connections
Insufficient tightening torques or vibrations can result in faulty electrical connections. This
can cause fire damage or malfunctions.
•
Tighten all power connections with the specified tightening torques, e.g. line supply
connection, motor connection, DC-link connections.
• Check regularly all power connections by retightening them with the prescribed
tightening torque. This applies in particular after transport.
Note
PE connection of the motor
The PE connection on the motor must be guided back directly to the cabinet unit and
connected there.
Direction of motor rotation
EN 60034-7 defines the two ends of an electric motor as follows:
● DE (Drive End): usually the drive end of the motor
● NDE (Non-Drive End): usually the non-drive end of the motor
An electric motor will rotate clockwise if the shaft is turning clockwise when looking at the DE
side.
For electric motors with 2 shaft ends, the direction of rotation must be determined based on
the shaft end specified as the drive end.
Note
Siemens motors with 2 shaft ends
For Siemens motors with two shaft ends, the drive side (DS) is the shaft end nearest to the
terminal box.
For clockwise rotation, the electric motor must be connected according to the following table.
Table 4- 4 Cabinet unit and motor connection terminals
Cabinet unit (connection terminals) Motor (connection terminals)
U2/T1 V
V2/T2 V
W2/T3 W
In contrast to the connection for the clockwise phase sequence, two phases have to be
reversed with a counter-clockwise phase sequence (looking at the drive shaft).