13
Detecting a ”rehit”
At hand-held applications, there is always a risk that the operator
starts a tightening on an already tightened bolt. This can disturb the
station’s batch counting.
Power Focus has a rehit detection based on tool speed in the fi rst
stage, and tightening angle in the fi nal stage.
To NOT be judged as a rehit, the tightening must reach 25% of Step
1 Speed (P131) in the fi rst stage, OR have an angle between First
(P111) and Final Target (P113) of at least 121 degrees.
A rehit will render a NOK tightening result, although the torque and
angle might have fallen inside the set monitoring windows. The rehit
event can be put out on a relay or the fi eldbus for external process
control devices.
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