Siemens SIMOVERT MASTERDRIVES Manual page 201

05.2006
Siemens AG 6SE7087-6QX70 (Version AG)
SIMOVERT MASTERDRIVES
Reversal backlash compensation (U872)
To activate reversal backlash compensation, parameter U872 must be
<> 0.
Reversal backlash compensation is used to compensate for mechanical
reversal backlash. In the case of an indirect measuring system (path
encoder on motor), the mechanical backlash is first traveled before the
effective (real) axis movement begins. The result is position errors.
There is no minimum travel distance.
Reversal backlash
The sign gives the preferred position for the reversal backlash
compensation.
This means:
Positive value = positive preferred position → on the first positive
movement after switching on the converter, no reverse backlash is
taken into account.
Negative value = negative preferred position → on the first negative
movement after switching on the converter, no reverse backlash is
taken into account.
Parameter value = 0:
No reversal backlash compensation takes place.
Compendium Motion Control
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Spindle
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Functions
7-35