Schneider Electric PM5100 manual Unary Alarms, Alarm Priorities

PowerLogic™ PM5100 series user guide Chapter 7—Alarms

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 7–2below.

Figure 7–2: How the power meter handles setpoint-driven alarms

Pickup

Setpoint

Dropout

Setpoint

Max2

Max1

	ΔT				ΔT
Pickup Delay				Dropout Delay
		EV1				EV2
			Alarm Period

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 (ΔT). 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.

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