Siemens SINAMICS S120 Commissioning Manual page 99

Figure 2-21
Determining the commutation angle using an oscilloscope
Once the oscilloscope has been connected, the drive must first pass the zero mark so that
fine synchronization can be carried out.
The angular, commutation offset can be determined by measuring the EMF and normalized
electrical pole position via an analog output.
Figure 2-22
Definition of channels (Ch1 ... Ch4):
● Ch1: EMF phase U to neutral point
● Ch2: EMF phase V to neutral point
● Ch3: EMF phase W to neutral point
● Ch4: Normalized electrical angular pole position via analog output
Commissioning
Commissioning Manual, (IH1), 07/2007 Edition, 6SL3097-2AF00-0BP7
The positive direction of the drive (clockwise rotating field)
Oscillogram
2.10 Commissioning linear motors (servo)
Commissioning
99