Pole Position Identification; Operation Without An Encoder; Operation With Encoder - Siemens SINAMICS S120 Function Manual
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5.14 Pole position identification
5.14
Pole position identification
For synchronous motors and synchronous reluctance motors, the pole position identification
determines its electrical pole position that is required for the field-oriented control. When
operated with one encoder, which is not adjusted to the pole position, then the identification
is used to calibrate and align the encoder.
5.14.1
Operation without an encoder
In encoderless operation, select the pole position identification using parameter p1780.6.
You must identify the pole position each time that you switch on the motor to operate it
without an encoder.
You set the technique that is suitable for the motor using parameter p1980 - and the current
using p0325 and p0329.
Note
Pole position identification is only possible at standstill
The shaft can move during pole position identification.
The pole position identification is used during the motor data identification to determine the
motor data. Faults F07968 or F07969 can occur during the motor data identification.
5.14.2
Operation with encoder
For operation with one encoder, which does not provide an absolute pole position (e.g. an
incremental encoder with zero mark), the encoder must be adjusted and the pole position
identified. The pole position identification is used for this purpose.
For encoders without position information (e.g. incremental encoders without zero mark),
pole position identification must be carried out each time that the motor is switched on. If the
position information is available, then pole position identification is only carried out once
when switching-on for the first time after the power returns.
Sequence: The encoder is adjusted once (commutation angle offset determined)
Precondition: The motor must be able to freely rotate.
1. After exiting commissioning, for encoders where the adjustment is possible, the
commutation angle offset is automatically activated (p1990 = 1).
Alarm A07971 is output.
2. The commutation angle is determined when the drive is switched-on for the first time. The
shaft is slowly turned to do this. Alarm A07975 is output.
3. After the commutation angle has been determined, the drive automatically switches-off
and writes the commutation angle (p0431).
Alarm A07971 disappears.
258
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
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