Connecting The Motor - Siemens SINAMICS G120C Operating Instructions Manual

4.8.3

Connecting the motor

Connecting a motor using a star or delta connection
With SIEMENS motors, you will see a diagram of
both connection types on the inside of the cover
of the terminal box:
• Star connection (Y)
• Delta connection (Δ)
The motor rating plate provides information about
the correct connection data.
Examples for operating the inverter and motor on a 400 V line supply
Assumption: The motor rating plate states 230/400 V Δ/Y.
Case 1: A motor is normally operated between standstill and its rated speed (i.e. a speed
corresponding to the line frequency). In this case, you need to connect the motor in Y.
Operating the motor above its rated speed is only possible in field weakening, i.e. the motor
torque available is reduced above the rated speed.
Case 2: If you want to operate the motor with the "87 Hz characteristic", you need to connect
the motor in Δ.
With the 87 Hz characteristic, the motor's power output increases. The 87 Hz characteristic
is mainly used with geared motors.
SINAMICS G120C converter
Operating Instructions, 07/2015, FW V4.7 SP3, A5E34263257B AC
Installing
4.8 Connecting the inverter
63