Schneider Electric 4000 manual Understanding the Alarm LOG, April Understanding the Alarm Log, 119

63230-300-212	Chapter 9—Disturbance Monitoring
April 2001	Understanding the Alarm Log

UNDERSTANDING THE ALARM LOG

Pickups and dropouts of an event are logged into the onboard alarm log of the circuit monitor as separate entries. Figure 9–5illustrates 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.

t1	t2
	Dropout
	Threshold
Pickup
Threshold
Event Log
Entry Value 1	Event Log
Pickup	Entry 2 Value	Dropout
Delay		Delay

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

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