Siemens Sinamics s120 Commissioning Manual page 210

Commissioning
3.13 Commissioning of SIMOTICS L-1FN3 linear motors
Determining the angular commutation offset by making a measurement
In the event of a fault and for a parallel connection, you must check the angular commutation
offset as follows.
1. The drive with an incremental measuring system must be fine synchronized. To do this,
connect the motor and enable the controller for coarse synchronization.
2. Then move the drive over the zero mark.
3. Remove power from the drive as described for the "Checking the phase voltage and the
pole position angle using an oscilloscope" technique.
Please note that for this technique, it is not permissible that the control voltage for the
Control Unit is shut down; however the infeed must be disconnected from the line supply.
You can determine the angular commutation offset by measuring the EMF and the
normalized electrical pole position angle via the analog output. The normalized electrical
pole position angle allows you to parameterize the test socket connections T0 to T2 and
retrieve the signals (see Chapter "Measuring sockets (Page 355)").
Definition of channels (Ch1 ... Ch4):
● Ch1: EMF phase U with respect to the neutral point
● Ch2: EMF phase V with respect to the neutral point
● Ch3: EMF phase W with respect to the neutral point
● Ch4: Normalized electrical angular pole position via analog output
Image 3-60 Setting measuring socket T0 on CU320
210
STARTER Commissioning Manual
Commissioning Manual, (IH1), 07/2016, 6SL3097-4AF00-0BP5