6.2.4 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.
Backlash in a spindle
With the appropriate setting, the converter corrects the positioning error caused by the backlash
when reversing.
The converter corrects the backlash under the following condition:
• For an incremental encoder, the axis must be referenced.
Referencing (Page 56)
• For an absolute encoder, the axis must be adjusted.
Absolute encoder adjustment (Page 68)
Measuring backlash
Procedure
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 converter.
Checking the actual position value (Page 40)
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 converter 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 dierence Δ = A ‑ B in the machine.
Figure 6-1 Measuring backlash
You have measured the backlash.
❒
Commissioning
6.2 Normalizing the encoder signal
Basic positioner
Function Manual, 09/2020, FW V4.7 SP13, A5E34257659B AG 41
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