Final Control Element Summary - ABB 800xA Operation

Final Control Element Summary

2.
3.
4.
5.
6.
The filtered sum is compared to certain severity levels and is presented in System
800xA alarm list.
In order to get reliable diagnoses, it is very important that the CLAM
configuration parameters are properly configured.
Final Control Element Summary
The Final Control Element Summary calculation is described in
Figure 52. Final Control Element Summary Calculation
Performance indices for stiction/backlash, leakage and non-linearity are thresholded
and multiplied with predefined weights.
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The indices are compared with certain thresholds. If the threshold is exceeded,
the resulting signal is set to one and to zero if not.
The thresholded signals are combined into pre-conditions/diagnoses.
The pre-conditions are multiplied with pre-defined weights. All weights are
normalized with the sum of all weights so that the weighted signals sum to one
if all pre-conditions are true.
The weighted signals are then summed together and the result is a numerical
value of the loop health.
The sum is filtered according to the formula D
Filter)*Dpast. This means that the temporary errors will not affect the result as
much as those which are present for a longer period of time.
Section 8 Control Loop Asset Monitor (CLAM)
current
= Filter*D + (1-
Figure 52.
3BUA000150-600