Pole Position Identification - Siemens SINAMICS S120 Function Manual

4.14

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.
1. Select a procedure with p1980.
2. 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 commutation angle offset during commissioning (p1990 = 1)
● Plausibility check for encoders with absolute information (p1982 = 2)
Motor motion through measurement on non-braked motors
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
Use default setting
When using standard Siemens motors, the automatically pre-selected setting should be kept.
Drive functions
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
The value in p1982 is not taken into account.
encoder pole pair number
the encoder pulse number
WARNING
Servo control
4.14 Pole position identification
149