KEB COMBIVERT F5 Reference Manual page 205

LP - Positioning Parameters
7) If the Inverter Status or Fault Log indicates 'Position Not Accessible' , the
drive will attempt to increase the deceleration and jerks in an attempt to prevent
overshooting the floor. If the car under or overshoots the floor, the position is
not accessible. Increase the rate of deceleration and/or jerk and then re-learn
the position. If this still does not resolve the problem, it may be necessary to
move the slowdown point further away from the floor.
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