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63230-300-212 Chapter 9—Disturbance Monitoring
April 2001 Understanding the Alarm Log
119
© 2001 Schneider Electric All Rights Reserved
Pickups and dropouts of an event are logged into the onboard alarm log of
the circuit monitor as separate entries. Figure 9–5 illustrates an alarm log
entry sequence. In this example, two events are entered into the alarm log:
• Alarm Log Entry 1—The value stored in the alarm log at the end of the
pickup delay is the furthest excursion from normal during the pickup delay
period
t1
. This is calculated using 128 data point rms calculations.
• Alarm Log Entry 2—The value stored in the alarm log at the end of the
dropout delay is the furthest excursion from normal during period
t2
from
the end of the pickup delay to the end of the dropout delay.
The time stamps for the pickup and dropout reflect the actual duration of
these periods.
Figure 9–5: Event log entries example
Once the alarm has been recorded, you can view the alarm log in SMS. A
sample alarm log entry is shown in Figure 9–6. See
SMS online help for
instructions on working with the alarm log.
Figure 9–6: Sample alarm log entry
UNDERSTANDING THE
ALARM LOG
t1
t2
Pickup
Threshold
Event Log
Entry Value 1
Pickup
Delay
Event Log
Entry 2 Value
Dropout
Delay
Dropout
Threshold