Automatic Encoder Adjustment - Siemens SINAMICS S120 Function Manual

2. To backup the new values, carry out a "RAM to ROM" after the adjustment.
4.18.2

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 in the
following cases:
● The pole wheel position encoders are not mechanically adjusted
● After a motor encoder has been replaced
Automatic encoder adjustment only makes sense for encoders with absolute position
information and/or zero mark. The following encoder types are supported:
● Sin/Cos encoder with A/B-, R-track as well as with A/B-, C/D-, R-track
● Resolver
● Absolute encoder (e.g. EnDat, DRIVE-CLiQ encoder, SSI)
● Incremental encoder with zero mark
Drive functions
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
4.18 Instructions for commissioning permanent-magnet synchronous motors
NOTICE
Maintain the minimum motor speed
During the rotating measurement, the motor speed must exceed 40% of the rated
speed. The torque must remain below half of the rated torque.
The parameter setting p1905 = 0 is made automatically at the end of the measurement,
which completes the fine adjustment. An additional alarm informs you that the result from
p0431 will be written to the RAM at the next pulse inhibit.
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.
Note
1FW4 permanent-magnet synchronous motors
1FW4 motors are optimized for operation with this function. When commissioning with the
STARTER commissioning tool, all of the required data is automatically transferred to the
Control Unit (see also SINAMICS S120 Commissioning Manual).
Vector control
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