Automatic Encoder Adjustment - Siemens Sinamics S120 Function Manual

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Fine adjustment

● Start the fine adjustment with the motor rotating with p1905 = 90. The measurement

Rotating measurement

During the rotating measurement, the motor speed must exceed 40% of the rated speed.

The torque must remain below half of the rated torque.

● At the end of the measurement, p1905 is set to 0. An additional alarm notifies the

To backup the new values, carry out a "RAM to ROM" after the adjustment.

The adjustment result is also valid, if, when the system/machine starts, the motor is driven by

other motors in the group of motors through the material web coupling. By correctly

evaluating the encoder, the Control Unit identifies the pole position and speed of the motor.

1FW4 permanent-magnet synchronous motors

1FW4 motors have been optimized for operation with this function. When commissioning

with the STARTER commissioning tool, all of the required data are automatically transferred

to the Control Unit. (see also SINAMICS S120 Commissioning Manual)

Automatic encoder adjustment

The pole wheel-oriented closed-loop control of the synchronous motor requires information

about the pole wheel position angle. Automatic encoder adjustment must be used under the

following conditions:

● The pole wheel position encoders are not mechanically adjusted

● After a motor encoder has been replaced

Drive functions

Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2

4.18 Instructions for commissioning permanent-magnet synchronous motors

takes approximately 1 minute. The actual steps of the fine encoder adjustment are

displayed using alarm A07976. During the measurement, the difference between the

encoder and the EMF model is determined. The fine adjustment can also be carried out

in no-load operation (idle operation).

operator that the result from p0431 will be written to the RAM at the next pulse inhibit.

Vector control

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