Siemens Sinamics S120 Function Manual page 111

When the motors are not braked, the motor rotates or moves as a result of the current
impressed during the measurement. The magnitude of the motion depends on the
magnitude of the current and the moment of inertia of the motor and load.
Note
Siemens standard motors
When using standard Siemens motors, the automatically pre-selected setting should be kept.
Notes regarding pole position identification
The relevant technique can be selected using parameter P1980. The following techniques
are available for pole position identification:
● Saturation-based 1st + 2nd harmonics (p1980 = 0)
● Saturation-based 1st harmonic (p1980 = 1)
● Saturation-based, two-stage (p1980 = 4)
● Motion-based (p1980 = 10)
● Elasticity-based (p1980 = 20)
The following supplementary conditions apply to the saturation-based motion technique:
● This technique can be used for both braked and non-braked motors.
● It can only be used for a speed setpoint = 0 or from standstill.
● The specified current magnitudes (p0325, p0329) must be sufficient to provide a
● For motors without iron, the pole position cannot be identified using the saturation-based
● For 1FN3 motors, it is not permissible to traverse with the 2nd harmonic (p1980 = 0, 4).
● With 1FK7 motors, a two-stage procedure must not be used (p1980 = 4). The value in
For the motion-based technique, the following supplementary conditions apply:
● The motor must be free to move and it may not be subject to external forces (no
● It can only be used for a speed setpoint = 0 or from standstill.
● If there is a motor brake, then this must be open (p1215 = 2).
● The specified current magnitude (p1993) must move the motor by a sufficient amount.
For the elasticity-based technique, the following supplementary conditions apply:
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
WARNING
significant measuring result.
technique.
p0329, which is set automatically, must not be reduced.
hanging/suspended axes).
Servo control
3.13 Pole position identification
109