Setting The Backlash - Siemens SINAMICS G120 Function Manual
Low-voltage inverter; basic positioner (epos) for cu250-2 control units
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3.4.2.4
Setting the backlash
Description
Backlash (also called play, dead travel on reversing etc.) is the
distance or the angle that a motor must travel through when the
direction of rotation reverses until the axis actually moves in the
other direction.
With the appropriate setting, the inverter corrects the positioning error caused by the
backlash when reversing.
The inverter corrects the backlash under the following condition:
● For an incremental encoder, the axis must be referenced.
See also section: Referencing (Page 53).
● For an absolute encoder, the axis must be adjusted.
See also section: Absolute encoder adjustment (Page 69).
Measuring backlash
Procedure
To measure the backlash, proceed as follows:
1. Move the axis to position A in the machine. Mark this position in the machine and note
down the actual position value in the inverter, see also Section: Checking the actual
position value (Page 36).
2. Move the axis a little bit more in the same direction.
3. Move the axis in the opposite direction until the actual position value in the inverter shows
the same value as at position A. Due to the backlash when reversing, the axis is now at
position B.
4. Measure the position difference Δ = A - B in the machine.
Figure 3-3
You have measured the backlash.
Basic positioner
Function Manual, 04/2015, FW V4.7 SP3, A5E34257659B AB
Measuring backlash
Basic positioner
3.4 Commissioning
Backlash in a spindle
37
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