Pole Position Identification - Siemens SINAMICS S120 Function Manual
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Vector control
4.18 Instructions for commissioning permanent-magnet synchronous motors
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.
Dangerous motor rotation or motion through measurement
The measurement causes the motor to rotate. The motor turns through a minimum of one
complete revolution.
Do not enter the working area of the motor.
Overview of important parameters (see SINAMICS S120/S150 List Manual)
• p0404.15
• p0431[0...n] Commutation angle offset
• p1990
• p1999[0...n] Commutation angle offset calibration and PolID scaling
4.18.3
Pole position identification
The pole position identification routine is used to determine 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 .
If possible, pole position identification should be carried out in decoupled state. If there is no
large moment of inertia and there is only negligible friction, then the identification can also be
carried out in coupled state.
If there is negligible friction and high moment of inertia, then the dynamic response for the
speed encoder can be adjusted to the moment of inertia by increasing p1999.
If there is high friction torque or an active load, then an adjustment is only possible in
decoupled state.
226
WARNING
Encoder configuration; commutation with zero mark (not induction motor)
Encoder adjustment, determine commutation angle offset
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
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