User Guide - Eurotherm Ltda

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nanodac RECORDER/CONTROLLER: USER GUIDE4.4.3 Alarm 1 Menu (Cont.)Hysteresis For absolute and deviation alarms, this provides a means of preventing multiple alarmtriggering, if the process value is drifting close to the trigger value.AmountFor rate-of-change alarms only. The alarm becomes active if the process value rises(Rise ROC) or falls (Fall ROC) by more than the specified ‘Amount’ within the time perioddefined in ‘Change Time’, below. The alarm remains active until the rate of changefalls below the value (Amount/Change Time) in the relevant sense.Change Time Settable to 1 second, 1 minute or 1 hour. See ‘Amount’ (above).Average Time For rate-of-change alarms only. This allows an averaging period (for the process value)to be entered to reduce nuisance trips due to signal noise, or if the rate of change ishovering around the trip value.LatchNone: the alarm remains active until the monitored value has returned to a non alarmstate, when it becomes inactive.Auto: The alarm remains active until the monitored value has returned to a non alarmstate and the alarm has been acknowledged. Acknowledgement can take place eitherbefore or after the value has returned a non alarm state.Manual: The alarm remains active until the monitored value has returned to a non alarmstate and the alarm has been acknowledged. Acknowledgement is permitted only afterthe value has returned a non alarm state.Trigger: Not enunciated, this mode is used only to initiate an action defined by userwiring either using iTools or using the user interface.BlockAlarms with ‘Block’ set to ‘On’ are inhibited until the monitored value has entered the'safe' condition after a start-up. This prevents such alarms from becoming active whilstthe process is brought into control. If a latching alarm is not acknowledged then thealarm is re-asserted (not blocked), unless the alarm’s threshold or reference value ischanged, in which case the alarm is blocked again.DwellInitiates a delay between the trigger source becoming active, and the alarm becomingactive. If the trigger source returns to a non alarm state before the dwell time haselapsed, then the alarm is not triggered and the dwell timer is reset.Acknowledge Select ‘yes’ to acknowledge the alarm. Display returns to ‘No’.ActiveRead only. Shows the status of the alarm as ‘Yes’ if it is active, or No, if inactive. The active/inactivestate depends on the Latch type (above) and acknowledgment status ofthe alarm. Always shows ‘No’ if the alarm is inbited (below).InactiveAs for ‘Active’ above, but shows ‘Yes’ if the alarm in inactive and ‘No’ if the alarm is active.Always shows ‘Yes’ if the alarm is inbited (below).N.acknowledged As for ‘Active’ above but shows ‘Yes’ for as long as the alarm is unacknowledged, and‘No’ as soon as it is acknowledged. Always shows ‘No’ if the alarm is inbited (below).Acknowledgement Fleetingly goes ‘Yes’ on alarm acknowledgement, and then returns to ‘No’.InhibitWhen ‘Inhibit’ is enabled, (tick symbol), the alarm is inhibited. Status is set to ‘Off’; ‘Active’and ‘N.acknowledged’ are set to ‘No’, and ‘Inactive’ is set to ‘Yes’. If the alarm isactive when inhibit is enabled, then it becomes inactive until inhibit is disabled, whenits status depends on its configuration. Similarly if the alarm trigger becomes activewhen the alarm is inhibited, the alarm remains ‘off’ until inhibit is disabled, when its statusdepends on its configuration.4.4.4 Alarm 2 menuAs above for Alarm 1 menu.Note: The parameters ‘Acknowledge’, ‘Active’, ‘Inactive’, ‘N(ot) Acknowledged’ and, ‘Acknowledgement’can all be ‘wired’ to other parameters, so, for example, a relay can be made to operate whilstthe alarm is inactive or whilst it is active or on acknowledgement etc. by wiring the relevant parameterto the relay’s ‘PV’ input. See Section 7 for details of user wiring.Page 86HA030554Issue 7 Nov 12
nanodac RECORDER/CONTROLLER: USER GUIDE4.4.5 Alarm typesThe following figures attempt to show graphically the meanings of the alarm parameters which can be setfor the various alarm types available.ABSOLUTE ALARMSAbsolute high alarm definitionsSymbolThresholdHysteresisInput signalAbsolute low alarm definitionsSymbolInput signalHysteresisThresholdHysteresis: 0Dwell: 0Hysteresis: 0Dwell: DHysteresis: yesDwell: 0Hysteresis: 0Dwell: 0Hysteresis: 0Dwell: DHysteresis: yesDwell: 0Hysteresis: yesDwell:DHysteresis: yes= Alarm activeDwell:D= Alarm activeFigure 4.4.5a absolute alarm parametersDEVIATION ALARMSDeviation low alarm definitionsReferenceDeviationHysteresisInput signalHysteresis: 0Dwell: 0Hysteresis: 0Dwell: DHysteresis: yesDwell: 0Hysteresis: yesDwell: DSymbolDeviation high alarm definitionsHysteresisDeviationReferenceInput signal= Alarm activeHysteresis: 0Dwell: 0Hysteresis: 0Dwell: DHysteresis: yesDwell: 0Hysteresis: yesDwell: D= Alarm activeSymbolDeviation band alarm definitionsSymbolHysteresisDeviationReferenceDeviationHysteresisInput signalHysteresis: 0Dwell: 0Hysteresis: 0Dwell: DHysteresis: yesDwell: 0Hysteresis: yesDwell: D= Alarm activeFigure 4.4.5b Deviation alarm parametersHA030554Issue 7 Nov 12Page 87
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User Guide - Eurotherm Ltda

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