Pole Position Identification - Siemens Sinamics S120 Function Manual

Servo control

3.13 Pole position identification

Overview of important parameters (see SINAMICS S120/S150 List Manual)
● r0047 Status identification
Standstill measurement
● p1909[0...n] Motor data identification control word
● p1910 Motor data identification, stationary
Rotating measurement
● p1958[0...n] Rotating measurement ramp-up/ramp-down time
● p1959[0...n] Rotating measurement configuration
● p1960 Rotating measurement selection
3.13 Pole position identification
For synchronous motors, the pole position identification determines its electrical pole
position, that is required for the field-oriented control. Generally, the electrical pole position is
provided from a mechanically adjusted encoder with absolute information.
A one-off pole position identification run is required for motors with encoders that are either
not calibrated or have not been adjusted.
● Select a technique using p1980
● Start the one-off pole position identification by setting p1990 = 1,
For Siemens 1FN1, 1FN3 and 1FN6 linear motors, p1990 is automatically set to 1 after
commissioning or after an encoder has been replaced.
For the following encoder properties, pole position identification is not required:
● Absolute encoder (e.g. EnDat, DRIVE-CLiQ encoder)
● Encoder with C/D track and pole pair number ≤ 8
● Hall sensor
● Resolver with a multiple integer ratio between the motor pole pair number and the
● Incremental encoder with a multiple integer ratio between the motor pole pair number and
The pole position identification is used for:
● Determining the pole position (p1982 = 1)
● Determining the angular commutation offset during commissioning (p1990 = 1)
● Plausibility check for encoders with absolute information (p1982 = 2)
108
the value in p1982 is not taken into consideration.
encoder pole pair number
the encoder pulse number
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Drive functions