ABB 800xA Operation page 148

Methodology
will be replaced with the current COPS, if it persists for more than three times the
Asset Monitor Sample Interval (AMSI).
Similarly, ACDs will be created if Unew has gone down by a percentage that is
configured by the user or more of Ubaseline, informing plant operations personnel
that the heat exchanger heat transfer efficiency has declined or fallen significantly
(based on the drop of Unew from Ubaseline), and should be investigated further.
Also ACDs will be created if Unew has gone up by a percentage that is configured
by the user or more of Ubaseline, indicating that the heat transfer efficiency has
improved or significantly improved (based on the rise of Unew from Ubaseline).
If any one or more BOPS go stale during Monitoring, an ACD is created informing
the plant operations personnel that one or more BOPS have gone stale. At this point
the Asset Monitor automatically goes back to Training.
Logging Function
If the Logging (Enable_Logging_Data) is enabled at configuration, the following
two additional functions will take place during training and operation of the Heat
Exchanger Asset Monitor:
•
•
Refer to
Optional Reporting
Optionally (to be specified at Asset Monitor configuration time), the Heat
Exchanger Asset Monitor can also send an ACD reporting any of the following
identified conditions:
•
•
148
Heat Exchanger Asset Monitor will execute once per minute, regardless of E
calculation/comparison period.
During each execution, all field inputs and calculated variables of interest will
be recorded in a flat text file by appending a comma delimited line of data to
the existing log file.
Log File Description (.csv file)
Staleness: If any one or more of the trained BOPS goes stale, an ACD is
created.
If Delta Tx has exceeded a high or low limit specified at configuration time.
Section 9 Heat Exchanger Asset Monitor (HXAM)
on page 176 for details on the Log File.
3BUA000150-600