63230-300-212 Chapter9—Disturban ceM onitoring
April 2001 Understandingthe Alarm Log
119
© 2001 Schneider Electric All Rights Reserved
Pickups anddropouts of an event are logged into the onboard alarm log of
the circuitmonitor as separate entries. Figure 9–5 illustrates an alar m log
entry sequence. Int hisexample, two events are entered into the alarm log:
•Alarm Log Entry 1—The value storedin the alarm log at the endof the
pickupdelay is the furthest excursion from normal during the pickupdelay
period

t1

. This is calculatedusing 128 data point rms calculations.
•Alarm Log Entry 2—The value storedin the alarm log at the endof the
dropout delayis the furthest excursion from normal during period

t2

from
the end of the pickupdelay to the end of the dropout delay.
The time stamps forthe pickup and dropout reflect the actual duration of
these periods.
Figure 9–5: Event log entries example
Once the alarm has been recorded, youcan view the alarm log in SMS. A
sample alarm log entryis shown in Figure 9–6. See SMS online help for
instructions onworking with the alarm log.
Figure 9–6: Sample alarm log entry
UNDERSTANDING THEALARM LOG
t1 t2
Pickup
Threshold
Event Log
Entry Value 1
Pickup
Delay
Event Log
Entry 2 Value Dropout
Delay
Dropout
Threshold