Schneider Electric PM870, PM820, PM810, PM850 manual Setpoint-driven Alarms, EV2Max2, EV1Max1

PowerLogicTM Series 800 Power Meter	63230-500-225A2
Chapter 6—Alarms	3/2011

Setpoint-driven Alarms

Many of the alarm conditions require that you define setpoints. This includes all alarms for over, under, and phase unbalance alarm conditions. Other alarm conditions such as digital input transitions and phase reversals do not require setpoints. For those alarm conditions that require setpoints, you must define the following information:

•Pickup Setpoint

•Pickup Delay

•Dropout Setpoint

•Dropout Delay

NOTE: Alarms with both Pickup and Dropout setpoints set to zero are invalid.

The following two figures will help you understand how the power meter handles setpoint- driven alarms. Figure 6–1shows what the actual alarm Log entries for Figure 6–2might look like, as displayed by PowerLogic software.

NOTE: The software does not actually display the codes in parentheses—EV1, EV2, Max1,

Max2. These are only references to the codes in Figure 6–2.

Figure 6–1: Sample alarm log entry

(EV2)(Max2)

PLSD110219

(EV1)(Max1)

Figure 6–2: How the power meter handles setpoint-driven alarms

	Max2
Max1
Pickup
Setpoint
Dropout
Setpoint
Pickup Delay	Dropout Delay
EV1	EV2
PLSD110143	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 waveform captures or forced data log entries.

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.

The power meter 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.

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