Edge Evaluation Of The Zero Mark - Siemens SINAMICS S120 Function Manual

Basic functions
7.19 Tolerant encoder monitoring
7.19.5

Edge evaluation of the zero mark

This functionality is suitable for encoders, where the zero mark ≥ 1 pulse wide. In this
particular case, errors would otherwise occur as a result of the edge detection of the zero
mark.
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
Commissioning
1. Set parameter p0437.1 = 1 to activate the "edge evaluation of the zero mark" function.
The factory setting p0437.1 = 0 keeps the operation at the known zero mark detection.
Parameterization
● 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"
distances is permitted:
"p4680 zero mark monitoring tolerance permissible"
This parameter makes the system less sensitive to issuing F3x100
pole position adaptation) and p0437.2 = 0 (no pulse number correction for faults) are set.
x = encoder number (x = 1, 2 or 3)
1)
338
a small, adjustable deviation of the zero mark
1)
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
) are activated.
1)
, if p0430.22 = 0 (no
1)
Drive functions