Siemens simovert masterdrives

09.2008 Functions
Siemens AG 6SE7087-6QX70 (Version AK)
SIMOVERT MASTERDRIVES Compendium Motion Control 7-35
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
Spindle
+
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.