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Performance indices
Sl.No
Name
10.
Outlier Index
11.
Noise Level Index
12.
Ratio Control error
vs. controller
output Index
13.
Automatic Mode
Index
14.
Saturation Index
15.
Cascade Mode
Index
98
Section 8 Control Loop Asset Monitor (CLAM)
Table 9. Indices used in CLAM
Description
Simple algorithm for detecting outliers by using
a sliding window, checking if single outliers
exceed the standard deviation significantly. [0-
1000 ‰]. Nominal 0 ‰ (no outlier).
Quantifies the amount of noise in the control
error signal. The actual noise level is compared
to the standard deviation of the control error. [0-
100 %]. Good operation if Index>50 %.
Quantifies the standard deviations of the
control error and the controller output. Too little
control effort resulting in large variation in the
process value is indicated with a large value
and heavy control effort with very efficient
control is indicated with a small value. [0-Inf].
Nominal: all values that are not extremely large
or small.
Quantifies the amount of time the control loops
is in automatic mode. Nominal 100 %.
Quantifies the times where the controller output
stays below 3% or above 97 % of the controller
output range for a significant amount of time.
[0-100%] Nominal 0 %.
Cascade mode index not directly related to
control performance. The index describes if the
loop setpoint is changed continuously or
stepwise (or not at all). [0-100 %] of samples in
data batch.
Index class
Data validity
Loop modes
Loop modes
Loop modes
Loop modes
Loop modes
3BUA000150-600
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