Checking The Angular Commutation Offset By Making A Measurement - Siemens SINAMICS S120 Commissioning Manual

2.13.6.2

Checking the angular commutation offset by making a measurement

Risk of electric shock when working on the DC link!
After opening the line switch, hazardous DC link voltages can always be present.
Observe the warning information on the component!
Check the voltage using a voltmeter (CAT III) between the motor terminals U - V; V - W; U -
W (DC voltage measuring range up to at least 600 V).
Checking the EMF voltages
If you have commissioned the built-in torque motor according to the appropriate instructions,
and in spite of this, unexpected messages are output, then initially you must check the
individual EMF voltages of the built-in torque motor. To do this, the following techniques are
described:
● Technique, "Recording the phase voltage and pole position angle using an oscilloscope"
● Technique, "Tracing the phase voltage and pole position angle" using the trace function
Technique, "Recording the phase voltage and pole position angle using an oscilloscope"
1. Switch the drive line-up into a no-current condition.
2. After the DC link has completely discharged, disconnect the motor cables from the
3. Form an artificial neutral point using 1 kΩ resistors (for a parallel connection, for each
4. Turn the rotor with the most constant speed possible in the clockwise direction. The rotor
Commissioning Manual
Commissioning Manual, (IH1), 01/2013, 6SL3097-4AF00-0BP3
DANGER
of the STARTER commissioning tool
converter.
If motors are connected in parallel, then disconnect them.
motor).
Figure 2-56 Arrangement for checking using measurements
is turning in a clockwise direction if, when viewing the DE flange, it rotates clockwise (see
also the Configuration Manual "SIMOTICS T-1FW6" built-in torque motors, Chapter
"Technical features").
2.13 Commissioning SIMOTICS 1FW6 built-in torque motors
Commissioning
195