Atlas Copco PowerMACS 4000, User Manual

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Tightening
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Two result variables are produced. "Bolt YP T", which is how much the torque increases
after the yield point, is calculated as
"Bolt YP T" = T
Cycle End
– T
YP
where T
Cycle End
is the Cycle End Torque (as described by Bolt Monitoring).
The second variable, "Bolt YP A" represents how much the angle is increased from the yield
point to the cycle end. It is calculated as:
"Bolt YP A" = A
Cycle End
– A
YP
The function checks that "Bolt YP T" is within the limits
YTH and YTL and that "Bolt YP A" is
within the limits YAH and YAL . Note that YTH and YTL can be negative.
All limits, that is, YTH , YTL , YAH and YAL , are optional. Leaving them blank disables the
respective check but the values are still calculated and reported.
If
Fatal is not checked a value outside the specified limits is considered to be a repairable
error. If a value cannot be calculated and at least one limit is specified for the check in
question it is always considered
Fatal . This is for example the case if the yield points are
not found or if the buffer is empty.