User manual 09/2009 - Schneider Electric

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User manual 09/2009 - Schneider Electric

AlarmsAlarms Associated with MeasurementsPresentationMicrologic 5 and 6 trip units are used to monitor measurements by means of:• 1 or 2 pre-alarms (depending on the type of trip unit) assigned to:• Long time protection (PAL Ir) for the Micrologic 5 trip unit• Long time protection (PAL Ir) and ground fault protection (PAL Ig) for the Micrologic 6 trip unitBy default, these alarms are active.• 10 alarms defined by the user as requiredThe user can assign each of these alarms to a measurement.By default, these alarms are not active.All the alarms associated with measurements can be accessed:• Via the communication network• On the front display module FDM121.The alarms associated with measurements can be assigned to an SDx module output (see Setting theSDx Module Output Parameters, page 127).Alarm SetupUser-defined alarms can be selected and their parameters set using the RSU software under the Alarmstab (see Alarm Setup, page 125).The alarm setup consists of:• Selecting the alarm priority level• Setting the alarm activation thresholds and time delaysThe alarm description tables indicate for each of the alarms:• The parameter setting range (thresholds and time delays)• The default setting valuesSee Detailed Tables of Alarms, page 110.Alarm Priority LevelEach alarm is given a priority level:• High priority• Medium priority• Low priority• No priorityAlarm indication on the front display module FDM121 depends on the alarm priority level.The priority level of each alarm can be set by the user, according to the urgency of the action to be taken.By default, alarms are medium priority, except for alarms associated with operating indicators which arelow priority (see Detailed Tables of Alarms, page 110).Alarm Activation ConditionsThe activation of an alarm associated with a measurement is determined directly by:• Positive crossing of the associated measurement pick-up threshold (superiority condition)• Negative crossing of the associated measurement pick-up threshold (inferiority condition)• Equality with the associated measurement pick-up threshold (equality condition)The type of monitoring is predetermined by the RSU software.106 LV434104 09/2009

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