Distance-Coded Zero Marks - Siemens SINAMICS S120 Commissioning Manual
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Also See for SINAMICS S120:
- Function manual (1094 pages) ,
- Diagnostic manual (947 pages) ,
- Manual (848 pages)
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A.6.7
Distance-coded Zero Marks
Description
Distance-coded measuring systems are used in preference where from the commissioning
viewpoint, homing is not possible or is not accepted, but traversing to determine the absolute
position is permitted.
The principle of the distance-coding is based on the counting of the zero mark distances
between two tracks with equidistant, but different, zero mark separations (Nonius principle).
● After switching on the measuring, the axis is in a non-homed/unsynchronized state. An
absolute position is NOT available.
● The absolute position can be calculated after traveling over at least two non-faulty zero
marks.
● The traversing range is limited as function of the zero mark distance.
The closed-loop control for velocity and position is closed using the incremental tracks. The
distance-coded zero marks are evaluated:
● After switch-on to determine the machine position
● Cyclically to monitor the incremental track against the absolute track
The following figure illustrates the distance-coded zero marks for a linear traversing motion.
Figure A-9
Commissioning with Startdrive
Commissioning Manual, 11/2017, 6SL3097-4AA10-0BP1
Linear traversing motion with distance-coded zero mark
A.6 Overview of measuring systems / encoders
Appendix
429
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