Deprag AST40-1 Operating Instruction Booklet page 122

Analysis:
OK evaluation:
The screwdriving sequence is considered OK (fault free), if the shut-off occurs
via torque and and the differential value is whithin the preset limits.
If the Angle monitoring option is active the final angle value must be within the
preset limits.
The screwdriving sequence is considered OK (fault free), if the shut-off occurs
via the differential torque calculated from the friction torque and the value of the
torque is whithin the preset limits.
Not OK analysis:
The screwdriving level is evaluated as Not OK (faulty) if the final torque is
outside the preset limits or the determined friction value is outside the indicated
limits.
If angle monitoring is active the screwdriving sequence is evaluated as Not OK,
if the angle of rotation is outside the preset limits.
The screwdriving sequence is also evaluated as Not OK when the screwdriving
time monitoring is exceeded.
Parameter:
Parameter:
The following parameters are used in the screwdriving sequence:
• Maximum time
Maximum time until the screwdriving sequence step is aborted
• Threshold torque for angle monitoring
Input of the torque value from where the angle monitoring should start
• Start angle friction measurement
Input of an angle value that should be realized after reaching the threshold torque
value, prior to activating the friction value monitoring.
• Screwdriver RPM 1
Input of the rotation speed that should be used for the first sequence step of the
screwdriving application.
• Friction measurement angle
Lower threshold of the angle range in which the friction monitoring should be active.
• Friction value creation: Mean value/maximum value
selectively the maximum value or mean value of the friction value can be used to
determine the friction torque.
• Minimum friction torque
Minimum torque limit during the friction monitoring range.
• Maximum friction torque
Maximum torque limit during the friction monitoring range.
• Minimum friction value
Minimum torque limit for the calculated friction torque value (variable)
• Maximum friction value
Maximum torque limit for the calculated friction torque value (variable).
• Note: The limits of the calculated friction torque can be set to a value that is tighter
than the limits of the individual friction values.
• Threshold torque for the start of screwdriver RPM 2
Input of the differential torque at which screwdirver RPM 2 should start. The actual
threshold torque value screwdriver RPM 2 is derived from the calculated friction
torque and the differential torque
• Screwdriver RPM 2
Input of the rotation speed that should be used for the screwdriving application.
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