probst FTZ Series Operating Instructions Manual page 15

Adjustments
The gripping range must be adjusted always in the right way (look adjustment of the gripping width).
Otherwise there is no warranty that the tension force is sufficient to grip the gripping good safety and
there is no danger, that it will be slide down.
At the adjusting of the gripping range must be accounted, that the lower nut on the threaded rod (1) do not drive on block
during the gripping action (lifting of a gripping good). That means, to keep a minimum distance from 50 mm between the
nut (3) and the bottom part (2). Otherwise is the buffer of the tension force to low.
5310.0363 V4
14 / 21
GB