Future Design MCT-MC 4.3, Руководство пользователя

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MCT-MC
4.3
Basic Operation - 61 - FDC MCT-MC
Once all settings have been made, press the “Return” button to return to the channel selection screen. Press
the “Save” button to store the current channel and axis entries or the “Cancel” button to exit chart setup without
altering the current chart settings. If channel selections or the time period for the chart has changed, all current
chart data will be cleared when the new entries are saved. The chart will then begin plotting new data according
to the new settings.
5.7 System Alarms
When an alarm condition occurs, the alarm icon flashes in the MC icon bar to provide a visual indication of an
alarm condition. An audible alarm will also sound if the alarm requires immediate operator attention such as a
loop communications failure or a process alarm set point has been exceeded. For more information on
adjusting the audible alarm volume, see Section 10.12.3, Alarm Volume.
NOTE: The MC loop controls can provide up to 3 alarm outputs each (for a total of 30 alarms). Depending
upon the configuration of the MC, some outputs may perform specific control or event functions. The
use of each output, and what it controls, is determined by the system designer. If there are questions
or concerns about the configuration and operation of your MC controller, contact your OEM for further
information. Only your OEM can address equipment related issues.
For information on alarm operation, see Section 9.4, Alarm Settings.
5.7.1 Alarm Monitor
The Alarm screen is accessed from the home “View” menu. It can also be displayed by pressing the alarm icon
whenever a new alarm occurs. It displays all current and/or previously acknowledged alarms according to time
and date of occurrence. Once the alarm is reset, the alarm icon will be hidden; however, the alarm condition
may still be present.
The alarm will be removed from the list when cleared by the operator by pressing the “Clear” button. Only
alarms that are not currently active in the system can be cleared from the alarm list.
IMPORTANT: If a loop control is in manual mode or in automatic tune and the reset button is preset, the alarm
reset will terminate automatic tune or manual mode and place the loop back into normal
operation.
Upon alarm reset, if the process no longer exceeds the alarm set point, but the loop control
alarm output has not yet reset due to the alarm hysteresis, the alarm reset will ignore the alarm
hysteresis and the alarm output will immediately go to the non-alarm output state.