Servo control
4.14 Pole position identification
Drive functions
158 Function Manual, 11/2017, 6SL3097-4AB00-0BP5
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.
The value in p1982 is not taken into account.
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
encoder pole pair number
● Incremental encoder with a multiple integer ratio between the motor pole pair number and
the encoder pulse number
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)
Unplanned motor motion when carrying out measurements at motors that are not braked
When the motors are not braked, the motor can move as a result of the current impressed
during the measurement. This can result in death or severe injury.
• Ensure that nobody is in the hazardous zone - and that the mechanical system can
freely move.
Note
Use default setting
When using standard Siemens motors, the automatically pre
-selected setting should be kept.
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