Atlas Copco PowerMACS 4000, User Manual

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Tightening
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Astart is defined as the angle where Tstart is reached for the first time when monitoring is
running and values are added to the buffer. If Tstart is empty Astart is the cycle angle when
monitoring is started (hence it is possible to measure negative angles).
Astop is defined as the angle where torque decreases below
Tstop (Astop
2
in the picture)
during the overshoot time . When torque exceeds Tstop , Astop is always reset to an
undefined value and a new Astop has to be found for the check to evaluate correctly. An
AStop found is valid as long as the torque does not exceed
Tstop later during the cycle.
Found positions are erased and reset if the buffer is cleared passed the found positions
(when a step is run in backward direction).
If both
Tstart and Tstop are empty the angle will be measured from monitoring start to
monitoring end. That is, Astart is defined as the cycle angle when monitoring is started and
Astop is the last measured cycle angle while monitoring is running (Aend
2
in the picture).
Astop is measured during all steps except for the SR step.
Both limits, that is,
AH and AL , are optional. Leaving them blank disables the check but the
result 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 the check is always
considered
Fatal . This is for example the case if Astart or Astop are not found or if the
buffer is empty.
Monitoring buffer selects which monitoring buffer the check should use.