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

Parameterization
● In parameter p0438 (squarewave encoder filter time) enter the filter time in the range
● You can see the active, effective filter time in parameter r0452.
Effect
You can calculate the influence of the filter time on the maximum possible speed as follows:
n_max [rpm] = 60 / (p0408 · 2 · r0452)
Here, p0408 is the pulse number of the rotary encoder.
Example
Specifications:
● p0408 = 2048
● r0452 = 10.24 [μs]
n_max is then calculated as follows:
● n_max = 60 / (2048 · 2 · 10.24 · 10
As a consequence, with this filter time you can operate the motor up to a maximum of 1430
rpm.
x = encoder number (x = 1, 2 or 3)
1)
6.18.5

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
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
from 0 to 100 μs. The hardware filter only supports values 0 (no filtering), 0.04 μs,
0.64 μs, 2.56 μs, 10.24 μs and 20.48 μs
If a value is set that does not match one of the discrete values specified above, the
firmware automatically sets the next closest discrete value. The drive does not output an
alarm or fault message.
Note
The zero mark alarms F3x100, F3x101 and F3x131
mark with a width of ¼ encoder pulse at half n_max speed, are suppressed when the
hardware filter is activated.
6.18 Tolerant encoder monitoring
, that are already output for a zero
1)
) = 1430 [rpm]
-6
Basic functions
) are activated.
1)
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