Atlas Copco PowerMACS 4000, User Manual

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Tightening
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6.5.5.5 Cycle RM
To enable Reject Management also on Monitoring errors all Monitoring checks can be configured as either
Fatal or Repairable.
When all bolts have reported Cycle End to the station and nothing is to be repaired the station orders the
bolts to do monitoring of the cycle. Then the bolt starts evaluation of the Monitoring conditions. The
spindles will report the result of the Monitoring checks to the station and if at least one not already
terminated spindle reports Repairable or Fatal reject management will be executed. The station uses the
status and RM settings of all not terminated rejected bolts to determine the reject action. The station
change state to Evaluating when monitoring starts, but re-enters state Running if Reject Management is
started.
Note 1 For configuration of Reject Action on a CE step only the First failure and Fatal failure settings
are available.
Note 2 No terminated spindles are involved in reject action for the cycle. This includes OK spindles that
are terminated after the last step before CE without termination step and thus keeps status OK.
Monitoring check results always affect the status of the individual bolt. OK or OKR bolts become
NOK if monitoring fails and no reject management is done.
Bolts that have been terminated before they reach the CE step will not participate in Reject Management
executed on the CE step. Bolts that have status NOK before the Monitoring checks are evaluated are
considered Repairable. There are only two possibilities for a bolt to reach the CE step with status NOK.
The first is that it as a reject bolt has been ordered to Continue (failing step was not repaired). The second
is that it as reject bolt has been ordered to Retry, but had no retry configured (failing step was not
repaired).
The status reported to the station after monitoring is constructed using the bolt status after executing the
ordinary steps and the result from evaluating monitoring. A cycle that is NOK before monitoring cannot
become OK due to correct monitoring checks.
However, a bolt that has status NOKRM before monitoring is evaluated will keep the NOKRM status also if
one or more monitoring checks fail.
The below table shows the possible outcome for the bolts involved in RM on the CE step (that is, all not
already terminated bolts):
Status before
evaluation of
Monitoring
checks Result of
Monitoring
checks Reject Management action
taken Best possible status after
repair
OK Acceptable None OK
Repairable According to First failure settings OKR
Fatal According to Fatal failure settings NOK
OKR Acceptable None OKR
Repairable According to First failure settings OKR
Fatal According to Fatal failure settings NOK