Siemens SINAMICS S120 Function Manual page 320

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Function modules

7.10 Connecting the motors in parallel

Counter-example:

The gear ratios used to couple the motors with the load are large and the backlash and

elasticity in the drive train are therefore high. If the load then causes one of the motors to

rotate, but the other is still stationary, the drive without an encoder will stall.

If a motor is defective, the individual motor will be shut down on overcurrent by the motor

circuit breaker. The power unit will be shut down by the control (if available) or, in the case of

a turn-to-turn fault in the motor, the power unit will switch to fault status. The motor must then

be decoupled from the parallel grouping. Parameter p0306 is changed by the DDS/MDS

Overview of important parameters (see SINAMICS S120/S150 List Manual)

● p0306[0...n] Number of motors in parallel connection

● p0307[0...n] Rated motor power

● p0640[0...n] Current limit

● p2002 Reference current

Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5

Drive functions