EAV15107-EN07

Example of over and under setpoint (standard) alarm operation

The meter supports over and under setpoint conditions on standard alarms.

A setpoint condition occurs when the magnitude of the signal being monitored crosses the limit specified by the pickup setpoint setting and stays within that limit for a minimum time period specified by the pickup time delay setting.

The setpoint condition ends when the magnitude of the signal being monitored crosses the limit specified by dropout setpoint setting and stays within that limit for a minimum time period specified by dropout time delay setting.

Over setpoint

When the value rises above the pickup setpoint setting and remains there long enough to satisfy the pickup time delay period (ΔT1), the alarm condition is set to ON. When the value falls below the dropout setpoint setting and remains there long enough to satisfy the dropout time delay period (ΔT2), the alarm condition is set to OFF.

  A Pickup setpoint
  B Dropout setpoint
  ΔT1 Pickup time delay period (in seconds)
  EV1 Start of alarm condition
  ΔT2 Dropout time delay (in seconds)
  EV2 End of alarm condition
  ΔT3 Alarm duration (in seconds)
  Max1 Maximum value recorded during pickup period
  Max2 Maximum value recorded during alarm period
     

The meter records the date and time when the alarm event starts (EV1) and when it ends (EV2). The meter also performs any task assigned to the event, such as operating a digital output. The meter also records maximum values (Max1, Max2) before, during or after the alarm period.

Under setpoint

When the value falls below the pickup setpoint setting and remains there long enough to satisfy the pickup time delay period (ΔT1), the alarm condition is set to ON. When the value rises above the dropout setpoint setting and remains there long enough to satisfy the dropout time delay period (ΔT2), the alarm condition is set to OFF.

  A Pickup setpoint
  B Dropout setpoint
  ΔT1 Pickup time delay period (in seconds)
  EV1 Start of alarm condition
  ΔT2 Dropout time delay (in seconds)
  EV2 End of alarm condition
  ΔT3 Alarm duration (in seconds)
  Min1 Minimum value recorded during pickup period
  Min2 Minimum value recorded during alarm period
     

The meter records the date and time when the alarm event starts (EV1) and when it ends (EV2). The meter also performs any task assigned to the event, such as operating a digital output. The meter also records minimum values (Min1, Min2) before, during or after the alarm period.

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