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Chapter 6—Alarms 63230-300-212
About Alarms April 2001
© 2001 Schneider Electric All Rights Reserved
86
Figure 6–1: Sample alarm log entry
Figure 6–2: How the circuit monitor handles setpoint-driven alarms
EV1—The circuit monitor records the date and time that the pickup setpoint
and time delay were satisfied, and the maximum value reached (Max1)
during the pickup delay period (∆T). Also, the circuit monitor performs any
tasks assigned to the event such as waveform captures or forced data log
entries.
EV2—The circuit monitor records the date and time that the dropout setpoint
and time delay were satisfied, and the maximum value reached (Max2)
during the alarm period.
The circuit monitor also stores a correlation sequence number (
CSN) for each
event (such as
Under Voltage Phase A Pickup, Under Voltage Phase A
Dropout
). The CSN lets you relate pickups and dropouts in the alarm log. You
can sort pickups and dropouts by
CSN to correlate the pickups and dropouts
of a particular alarm. The pickup and dropout entries of an alarm will have
the same
CSN. You can also calculate the duration of an event by looking at
pickups and dropouts with the same
CSN.
(EV2)
(EV1)
(Max2)
(Max1)
EV1
EV2
Max1
Max2
∆T ∆T
Pickup Delay
Dropout Delay
Pickup Setpoint
Dropout Setpoint
Alarm Period