Mechanical System - Siemens SINAMICS S120 Commissioning Manual

Fine synchronization
The pole position identification (PolID) technique provides coarse synchronization. If zero
marks are present, after traversing the zero mark(s), the pole position is calibrated
automatically with the zero mark position (fine synchronization). The zero mark position must
be calibrated mechanically or electrically (p0431). If the encoder system permits this
calibration, a fine synchronization is recommended (p0404.15 = 1) because it avoids
measurement spreads and permits an additional test of the determined pole position.
Suitable zero marks are:
● A zero mark in the complete traversing range
● Equidistant zero marks
● Distance-coded zero marks
4.8.3.9

Mechanical system

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In the "Mechanical system" screen form, check the settings of the position control and adjust
them if necessary. Depending on the encoder type selected for position control and the
motor encoder, various configurations are displayed for the mechanical system.
The "Position tracking" option allows the load position to be reproduced when using
gearboxes. This option can also be used to extend the position range. The position tracking
of the load gear however, is only relevant for a motor encoder (encoder 1).
Parameterizing encoder selection for position control
An encoder is assigned to the position control during commissioning. This encoder setting is
shown in a drop-down list at the top right in the "Mechanical system" screen form. You can
change the encoder assignment in this screen form before parameterizing the position
control. The following options are available:
1. Select the required encoder in the "Encoder system" (p2502) drop-down list.
– No encoder
– Encoder 1
– Encoder 2
– Encoder 3
2. Enter the motor revolutions for the gear ratio between the motor shaft and load shaft in
the "Number of motor revolutions" (p2504) field.
3. Enter the load revolutions for the gear ratio between the motor shaft and load shaft in the
"Number of load revolutions" (p2505) field.
4. Enter the neutral length unit LU per load revolution in the "LU per load revolution" (p2506)
field.
Commissioning with Startdrive
Commissioning Manual, 12/2018, 6SL3097-5AA10-0BP0
"Drive axis > Parameters > Basic parameterization > Mechanical system"
4.8 Basic parameterization of the drive objects
Commissioning
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