Atlas Copco PowerMACS 4000, User Manual

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Tightening
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6.5.2.11 RA - Release angle
Step type Id: 12
Parameters: T (Torque), Mask1, Mask2, DIR (Direction).
Function : Run until torque decreases below 0.3 * peak torque (measured during the step).
First run for Mask1 seconds in the DIR direction then measure the torque. Should the
measured torque be less than T the step is stopped with status OK.
Start monitoring of peak torque and continue to run for Mask2 seconds in the DIR direction.
During this time the step is not shut off regardless of the measured torque.
From this point continue to run in the DIR direction until the measured torque is less than
0.3 * the peak torque (measured from that the timer Mask2 was started).
The Release angle can be reported from this step. It is measured from the point where the
torque reaches its highest value to the point where the projected torque vs. angle curve
should have crossed the angle axis if not shut off. Please note that the peak torque is not
checked for during Mask1.