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In Lexium range drive the permissible range of motor shaft movement if absolute position is to be retained while servo drive is powered off.

Permissible range of motor shaft movement is +/ - 0.25 revolution from the position at which motor shaft position was
at the moment servo drive was powered OFF. I
f movement of motor shaft crosses this limit while servo drive is powered OFF,
upon re-applying power to servo drive, servo drive will trip on fault code E 734C that indicates that absolute position of motor
shaft detected is not with in permissible range.
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