Siemens SINAMICS S120 Commissioning Manual page 415

Incremental tracks
This field is already preassigned for most encoders. The number of pulses per revolution can
also be specified in bits in the encoder data sheets. Encoder pulse number = 2
can obtain the resolution from the bit.
Enter the number of pulses per revolution for your encoder.
Coarse synchronization
With the coarse synchronization you define how the pole position identification is to be
carried out. The following options can be selected:
● C/D track
The flux position can be determined using the C/D track and the zero mark, which is
adjusted to the magnetic position of the rotor. As the C/D track only has one encoder
pulse per mechanical revolution, the accuracy of this determination method is only
adequate for starting. Therefore, you must carry out a fine synchronization.
● Hall sensor (only for linear motors)
Hall sensors are used that measure the magnetic flux in the air gap. Two sensors are
used, which supply information equivalent to the C/D track.
● None
Zero marks
Zero marks serve as reference signal for incremental encoders. The following zero signals
can be selected for your encoder:
● No zero mark
● Equidistant zero marks (evaluate several zero marks)
– The number of pulses between the two equidistant zero marks are displayed at "Zero
– At "Number of zero marks", enter how many zero marks you want to evaluate.
● Irregular zero marks
Select this option if you do not want to evaluate the zero marks at each revolution, i.e.
you want to evaluate them irregularly.
● Distance-coded zero marks (Page 429)
Gear ratio / measuring gearbox
Gearboxes or measuring gearboxes are relevant only for some motor types, e.g. for 1FW3
torque motors. The gear ratio is the ratio of encoder revolutions (p0432) to the number of
motor or load revolutions (p0433) and is also termed the transmission ratio.
This information is contained in the motor data sheet.
Commissioning with Startdrive
Commissioning Manual, 11/2017, 6SL3097-4AA10-0BP1
mark distance".
A.6 Overview of measuring systems / encoders
Appendix
. You
resolution
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