Pole Position Adaptation - Siemens SINAMICS S120 Function Manual

For a positive direction of rotation, the positive edge of the zero mark is evaluated and for a
negative direction of rotation, the negative edge. As a consequence, for encoders where the
zero mark is wider than one pulse, it is possible to parameterize them with equidistant zero
marks (p0404.12 = 1), i.e. the zero mark checks (F3x100, F3x101
x = encoder number (x = 1, 2 or 3)
1)
Commissioning the function
Set parameter p0437.1 = 1 to activate the function.
The factory setting p0437.1 = 0 keeps the operation at the known zero mark detection.
Setting the zero mark distance
Under unfavorable conditions, if the drive oscillates around the zero mark for one revolution, a
zero mark error can occur with the rough order of magnitude of the zero mark width. This
behavior can be avoided using the appropriate value of parameter p4686 (zero mark minimum
length). You can assign ¾ of the zero mark width to parameter p4686 in order to achieve the
most rugged behavior possible.
In order that the drive, for small inaccuracies, does not output fault F3x100 (N, A) "Encoder x:
Zero mark distance error"
permitted. The parameter p4680 (zero mark monitoring tolerance permissible) makes the
system less sensitive to the occurrence of fault F3x100
adaptation) and p0437.2 = 0 (no pulse number correction for faults) are set.
x = encoder number (x = 1, 2 or 3)
1)
8.21.6

Pole position adaptation

Overview
If zero marks repeatedly return (e.g. due to a dirty encoder disk), the drive adds the missing
pulses to the pole position to correct the pole position error. If too many pulses are added (e.g.
due to EMC interferences), then these will be subtracted when the zero mark is exceeded.
Function description
When the pole position adaptation is activated, the incorrect pulses on the A/B track are
corrected in the pole position for commutation. The tolerance bandwidth for the zero mark is
±30° electrical. The rate of correction is ¼ of an encoder pulse between two zero marks; this
means that sporadically missing or superfluous pulses are corrected.
Note
When the "Commutation with zero mark" function (p0404.15 = 1) is activated, then the system
waits until fine synchronization has been completed before making a correction (r1992.8 = 1).
Drive functions
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
, a small, adjustable deviation of the zero mark distances is
1)
Basic functions
8.21 Tolerant encoder monitoring
) are activated.
1)
, if p0430.22 = 0 (no pole position
1)
373