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PowerLogic™ PM5100 series user guide Chapter 7—Alarms
© 2014 Schneider Electric All Rights Reserved 53
Many of the 1-second alarms are three-phase alarms. Alarm setpoints are evaluated for
each of the three phases individually, but the alarm is reported as a single alarm. The
alarm pickup occurs when the first phase exceeds the alarm pickup magnitude for the
pickup time delay. The alarm is active as long as any phase remains in an alarm state.
The alarm dropout occurs when the last phase drops below the dropout magnitude for the
dropout time delay. See Figure 7–2 below.
EV1—The power meter 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 power meter performs any tasks assigned to the event such as operation
of a digital output.
EV2—The power meter records the date and time that the dropout setpoint and time
delay were satisfied, and the maximum value reached (Max2) during the alarm period.
Unary Alarms
The power meter has four unary alarms. These alarms help alert you when the meter
powers on after a control power loss, when the meter resets for any reason, when the
meter self-diagnostic feature detects a problem, or when the meter detects a phase
rotation different than expected.
Alarm Priorities
Each alarm has a priority level. Use priorities to help distinguish between events that
require immediate action and those that do not require action. See “Setting up the alarm /
energy pulsing LED” on page 39 for information on configuring the alarm LED for alarm
mode.
• High priority—if a high priority alarm occurs, the display informs you in two ways: the
alarm LED on the display flashes until you acknowledge the alarm, and the alarm icon
blinks while the alarm is active. An alarm message is displayed while the alarm is
active. See “Viewing Unacknowledged Alarms and the Alarm History Log” on page 59
for information on acknowledging alarms.
• Medium priority—if a medium priority alarm occurs, the alarm LED and the alarm
icon blink only while the alarm is active. An alarm message is displayed while the
alarm is active.
Figure 7–2: How the power meter handles setpoint-driven alarms
ΔT ΔT
Max1
Max2
Pickup
Setpoint
Dropout
Setpoint
Pickup Delay
Dropout Delay
EV1
EV2
Alarm Period