Automatic Encoder Adjustment; Pole Position Identification - Siemens Sinamics s120 Commissioning Manual

Commissioning
3.16 Commissioning permanent-magnet synchronous motors
3.16.2

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
Encoder adjustment using a zero mark
If an incremental encoder with zero mark is being used, after the zero mark has been
passed, the position of the zero mark can be calibrated. Commutation with the zero mark is
activated via p0404.15.
Commissioning the encoder
Automatic encoder adjustment is activated with p1990 = 1. When the pulses are enabled the
next time, the measurement is carried out and the angular difference determined (p1984) is
entered into p0431. For p1990 = 2 the determined angular difference (p1984) is not entered
into p0431 and has not effect on the closed-loop motor control. Using this function, the
angular difference - entered into p0431 - can be checked. For extremely high moments of
inertia, the run time can be scaled higher using p1999.
Danger to life as a result of motor movement during measurement
The measurement can trigger rotation or movement of the motor. This can cause death or
serious injury.
• Ensure that nobody is in the danger zone of the motor.
3.16.3

Pole position identification

The pole position identification routine is used to determine the rotor position at start up. This
is required when no pole position information is available. If, for example, incremental
encoders are used or operation without encoder is employed, then pole position identification
is started automatically. For operation with encoder, pole position identification can be
started via p1982 = 1, or via p1780.6 = 1, for operation without encoder .
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WARNING
STARTER Commissioning Manual
Commissioning Manual, (IH1), 07/2016, 6SL3097-4AF00-0BP5