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11.1.4 Fasten / Loosen to external Stop-Signal
The screwdriving strategy Fasten/Loosen to External Stop-Signal is a screwdriving proc-
ess with switch off to external signal.
Figure 47: Fasten / Loosen to external Stop-Signal
Sequence of the Screwdriving Strategy:
• at the start of the screwdriving start of the screwdriver with pre-selected speed and
time monitoring
• cyclic torque and rotation angle measurement completed
• External stop signal monitored
Switching -Off Criteria:
The screwdriving sequence is completed when
• an external Stop-Signal is received
• the maximum angle is exceeded
• the maximum torque is exceeded
the maximum allowable screwdriving time (time supervision) has run out
Evaluation:
O.K. Evaluation
The screwdriving level is evaluated as OK, if:
• switching off occurs via the external stop signal.
• Torque and angle are within the permissible limits.
NOT O.K. Evaluation
The screwdriving level is evaluated as not OK, if:
• the torque and angle of rotation is outside the set limits.
• the screwdriving time is exceeded.
Parameters:
• Maximum allowable time to reach the shut-off angle (time supervision)
• Shut-Off Angle min / max
• Torque min/max
• Speed
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