MODEL 2604 CONTROLLER - USER GUIDE - d a n m a r k
MODEL 2604 CONTROLLER - USER GUIDE - d a n m a r k MODEL 2604 CONTROLLER - USER GUIDE - d a n m a r k
Alarm Operation2604 ControllerDeviation Alarms. The setpoint used for deviation alarms is normally derived as a remoteinput from another device - for example, a temperature controller. The setpoint can also beinternally set within the controller - in this case called the local setpoint value.Blocking Alarms only occur after the start up phase when the alarm has first entered a safestate. The alarm is only indicated the next time it is active. It is used, for example, to ignorestart up conditions which are not representative of running conditions.Hysteresis is the difference between the point at which the alarm switches ON and the pointat which it switches OFF.It is used to prevent relay chatter.Delay a settable time between an alarm occurring and it being displayed on the indicatorLatching Alarms The alarm is indicated until it is acknowledged by the user.Acknowledgement of an alarm can be through the controller front buttons, from an externalsource using a digital input to the controller or through digital communications.There are two ways that the alarm can be acknowledged:1. Automatic Reset. The alarm continues to be active until both the alarm condition isremoved AND the alarm is acknowledged. The acknowledgement can occur BEFOREthe alarm condition is removed.2. Manual Reset. The alarm continues to be active until both the alarm condition isremoved AND the alarm is acknowledged. The acknowledgement can only occurAFTER the alarm condition is removed.5.2.1. Grouped AlarmsAlarms can be associated with different aspects of the process. They are grouped inaccordance with the functions they perform as follows:Loop AlarmsPV Input AlarmsAnalogue InputAlarmsModule AlarmsUser AlarmsAlarms associated with each control loop. Examples are: High,Low, Deviation and Rate of Change. Two alarms are available foreach loop. On a new controller these are the only alarms which areconfigured - those listed below must be enabled in configurationlevel, see 2604 Engineering Handbook HA026761.Alarms which operate on the PV input. Examples are: High andLow. Two alarms are available with this input.Alarms which operate on the analogue input. Examples are: Highand Low. Two alarms are available with this input.Alarms which operate on each plug in module. These can be inputor output alarms depending upon the function of the module fitted.These alarms are associated with modules 1, 3, 4, 5, & 6, sincemodule 2 is reserved as a an extra memory moduleEight undedicated alarms which can be wired to any variable.5-4 User Guide Part No HA026491 Issue 3.0 Apr-02
2604 Controller Alarm Operation5.3. HOW ALARMS ARE INDICATEDWhen an alarm occurs the red ALM beacon in the middle display will flash. This will beaccompanied by a message on the lower display which will indicate the source and the type ofalarm. The format of this alarm message is:Alarm source (user definable text)Alarm message%:LP1Full Scale Low%:LP1Press P+S to AckAlternatingmessageAlarm sourceInstructionIf a relay has been connected to the output of the alarm the relay it will operate to allow anexternal beacon or audible device to be activated.Events will not cause either a message or the beacon to be illuminated.5.3.1. To Acknowledge an AlarmPress P+S as instructed.The action which follows depends upon the type of alarm configured.If the alarm is non latchingAlarm is latching – ‘Auto’Alarm is latching – ‘Manual’Any relay connected to the alarm output will be resetThe red alarm beacon will illuminate permanently if thealarm condition still existsThe red alarm beacon will extinguish as soon as the alarmcondition no longer existsAny relay connected to the alarm output will remain set if thealarm condition still existsThe red alarm beacon will illuminate permanently if thealarm condition still existsAs soon as the alarm condition is no longer present the alarmbeacon will extinguish and any relay will be resetAny relay connected to the alarm output will remain set if thealarm condition still existsThe red alarm beacon will illuminate permanently if thealarm condition still existsThe alarm indication and any relay connected to it must nowbe reset. This may be done as described in section 5.4 ‘TheAlarm Summary Page’, or by choosing the appropriateAlarm Page, select ‘Alarm Ack’ - set to ‘Yes’, Press S asinstructed.This section describes the usual method to acknowledge an alarm. Section 5.5 describesalternative ways.User Guide Part No HA026491 Issue 3.0 Apr-02 5-5
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Alarm Operation<strong>2604</strong> ControllerDeviation Alarms. The setpoint used for deviation alarms is normally derived as a remoteinput from another device - for example, a temperature controller. The setpoint can also beinternally set within the controller - in this case called the local setpoint value.Blocking Alarms only occur after the start up phase when the alarm has first entered a safestate. The alarm is only indicated the next time it is active. It is used, for example, to ignorestart up conditions which are not representative of running conditions.Hysteresis is the difference between the point at which the alarm switches ON and the pointat which it switches OFF.It is used to prevent relay chatter.Delay a settable time between an alarm occurring and it being displayed on the indicatorLatching Alarms The alarm is indicated until it is acknowledged by the user.Acknowledgement of an alarm can be through the controller front buttons, from an externalsource using a digital input to the controller or through digital communications.There are two ways that the alarm can be acknowledged:1. Automatic Reset. The alarm continues to be active until both the alarm condition isremoved AND the alarm is acknowledged. The acknowledgement can occur BEFOREthe alarm condition is removed.2. Manual Reset. The alarm continues to be active until both the alarm condition isremoved AND the alarm is acknowledged. The acknowledgement can only occurAFTER the alarm condition is removed.5.2.1. Grouped AlarmsAlarms can be associated with different aspects of the process. They are grouped inaccordance with the functions they perform as follows:Loop AlarmsPV Input AlarmsAnalogue InputAlarmsModule AlarmsUser AlarmsAlarms associated with each control loop. Examples are: High,Low, Deviation and Rate of Change. Two alarms are available foreach loop. On a new controller these are the only alarms which areconfigured - those listed below must be enabled in configurationlevel, see <strong>2604</strong> Engineering Handbook HA026761.Alarms which operate on the PV input. Examples are: High andLow. Two alarms are available with this input.Alarms which operate on the analogue input. Examples are: Highand Low. Two alarms are available with this input.Alarms which operate on each plug in module. These can be inputor output alarms depending upon the function of the module fitted.These alarms are associated with modules 1, 3, 4, 5, & 6, sincemodule 2 is reserved as a an extra memory moduleEight undedicated alarms which can be wired to any variable.5-4 User Guide Part No HA026491 Issue 3.0 Apr-02
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