Siemens 9410DC, User Manual, Page: 127 / 172

Alarms and alerts 9410 series
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.
EV1 EV2
∆T1
∆ T
2
∆T3
Ma x1
Ma x2
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.
EV1 EV2
∆ T1
∆T2
∆T3
Min1
Min2
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 Maximum value recorded during pickup period
Min2 Maximum value recorded during alarm period
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