Deprag AST11-1 Operating Instruction Booklet page 86

Switching off criteria:
The screwing process is ended once the
• cut-out torque is reached
• a monitoring criteria is reached
• the maximum screwing time (monitoring time) is expired
Analysis:
OK evaluation:
The screwing level is considered OK (fault free), if the switching off occurs via
the differential moment and the value of the torque is in the set limits.
On the angle of rotation monitoring option the reached angle must be within the
set limits.
Not OK analysis:
The screwing level is evaluated as Not OK (faulty) if the torque is outside the
set limits.
On an active angle of rotation the screwing level is evaluated as Not OK, if the
angle of rotation is outside the indicated limits.
The screwing level is also evaluated as Not OK when the monitoring time is ex-
ceeded.
Parameter:
The following parameters are used in the screwing sample:
• Supervision time
Maximum time until the screwing level is aborted
• Differential torque
Input of the differential end moment
The actual target moment/torque results from the sum of the torque of the previous
level and the differential moment.
• Differential torque lower limit
Lower limit of the differential end moment. The actual torque lower limit results from
the sum of the torque of the previous level and the lower limit of the differential mo-
ment.
• Differential torque upper limit
Upper limit of the differential end moment. The actual torque upper limit results from
the sum of the torque of the previous level and the upper limit of the differential mo-
ment.
• Speed 1
Input of the rotation speed that should be used for the screwing application.
• Threshold torque Speed 2
Input of the differential torque at which the torque decrease on the second rotation
speed occurs. The actual swell torque for the rotation speed decrease results from
the sum of the torque of the previous level and the differential moment.
• Speed 2
Input of the rotation speed that should be used for the screwing application.
• Torque holding time
A holding time can be defined to keep the torque for this time.
• Final values type: differential torque / total torque
Selectively the end torque can be displayed as difference between the total torque
and the torque of the previous level or as total torque in the end values.
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