Siemens Sinamics s120 Commissioning Manual page 233

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.
Traversing
Four pole position identification techniques can be selected:
● p1980 = 1, voltage pulsing, first harmonic
This technique functions for magnetically isotropic motors if adequate iron saturation can
be achieved.
● p1980 = 4, voltage pulsing, 2-stage
This technique functions with motors that are magnetically anisotropic. During the
measurement, the motor must be at a standstill. The measurement is carried out the next
time that the pulses are enabled.
Note
Using this type of identification, the motor can emit a significant amount of noise.
● p1980 = 6, voltage pulsing, 2-stage inverse
● p1980 = 10, DC current impression
This technique functions for all motors; however, it takes more time than the
measurement selected via p1980 = 4. During the measurement, the motor must be able
to rotate. The measurement is carried out the next time that the pulses are enabled. For
extremely high moments of inertia, the run time can be scaled higher via p1999.
STARTER Commissioning Manual
Commissioning Manual, (IH1), 07/2016, 6SL3097-4AF00-0BP5
WARNING
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 Commissioning permanent-magnet synchronous motors
Commissioning
233