Emerson Process Management ControlWave XFC - Manual (Page 111)

CI-ControlWave XFC Appendix F / F- 9
Alarm at a level of %
The Alarm at a level of % setting can be configured as percentage of Volume (MCF) or
Energy (MMBTU). This feature allows the ControlWave XFC to provide an alarm
(logical nomination alarm) or indication to an operator or computer that a specified
amount of target has been reached. The number entered (1 to 100) sets the percentage
at which the logical nomination alarm will occur. The status of this setting, i.e., whether
or not a nomination alarm has occurred, can be determined via the Alarm Status signal
(see Figure F-8).
Alarm Status
When the amount specified in ‘Alarm at a Level of (%)’ is reached, the value of the
signal will be set true.
CURRENT NOMINATION PERIOD - This section allows the operator to view the
following information associated with a nomination which is currently in progress:
Start: day/hour
The actual time and day of the month when the current nomination period started is
displayed. This may be the programmed time or the time at which an operator manually
started a period.
Stop: day/hour
The programmed end time and day of the month at which the current nomination
period will end. If using the Fast approach mode, the period may end sooner, i.e., when
the target is reached. If using the daily nomination feature, the stop date (day) will
show 0 to indicate that only the hour matters.
Target value (x 1000)
The Target value provides the value of Volume/Energy to be delivered during this
period.
Amount Delivered (x 1000)
The Amount Delivered reading provides the actual amount of volume/energy delivered
so far during this period.
Percent elapsed time
This signal shows the percentage of time which has elapsed for the current nomination
period, e.g., 4 hours into a 100 hour nomination period would cause this value to be 4.0.
Percent Delivered
This signal provides the percentage of target delivered to this point in the current
nomination period.
NEXT NOMINATION PERIOD - This section allows the operator to set/view the
following parameters associated with the next nomination which is to be programmed
(has been programmed): Note: New entries must be made prior to the ending of the
current nomination period.
Start: day/hour
The actual start day of the month (1-31) and start hour (0-23) when the next nomination
period is to start is displayed or entered. The start day is ignored if the daily nomination
feature is enabled.