Schneider Electric PM870 manual Scaling Alarm Setpoints, Alarm Conditions and Alarm Numbers, Limit

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

Scaling Alarm Setpoints

This section is for users who do not have PowerLogic software and need to set up alarms from the power meter display. It explains how to scale alarm setpoints.

When the power meter is equipped with a display, most metered quantities are limited to five characters (plus a positive or negative sign). The display will also show the engineering units applied to that quantity.

To determine the proper scaling of an alarm setpoint, view the register number for the associated scale group. The scale factor is the number in the Dec column for that register. For example, the register number for Scale D to Phase Volts is 3212. If the number in the Dec column is 1, the scale factor is 10 (101=10). Remember that scale factor 1 in

Table 6–3 on page 50 for Scale Group D is measured in kV. Therefore, to define an alarm setpoint of 125 kV, enter 12.5 because 12.5 multiplied by 10 is 125. Below is a table listing the scale groups and their register numbers.

Table 6–3: Scale Group Register Numbers

Scale Group	Register Number
Scale Group A—Phase Current	3209
Scale Group B—Neutral Current	3210
Scale Group C—Ground Current	3211
Scale Group D—Voltage	3212
Scale Group F—Power kW, kVAR, kVA	3214

Alarm Conditions and Alarm Numbers

This section lists the power meter’s predefined alarm conditions. For each alarm condition, the following information is provided.

•Alarm No.—a position number indicating where an alarm falls in the list.

•Alarm Description—a brief description of the alarm condition

•Abbreviated Display Name—an abbreviated name that describes the alarm condition but is limited to 15 characters that fit in the window of the power meter’s display.

•Test Register—the register number that contains the value (where applicable) that is used as the basis for a comparison to alarm pickup and dropout settings.

•Units—the unit that applies to the pickup and dropout settings.

•Scale Group—the scale group that applies to the test register’s metering value (A–F). For a description of scale groups, see “Scale Factors” on page 49.

•Alarm Type—a reference to a definition that provides details on the operation and configuration of the alarm. For a description of alarm types, refer to Table 6–6 on page 52 .

Table 6– 4 lists the default alarm configuration - factory-enabled alarms.

Table 6– 5 lists the default basic alarms by alarm number.

Table 6– 6 lists the alarm types.

Table 6–4: Default Alarm Configuration - Factory-enabled Alarms

Alarm		Pickup	Pickup	Dropout	Dropout
	Standard Alarm		Limit Time		Limit Time
No.		Limit		Limit
			Delay		Delay
19	Voltage Unbalance L-N	20 (2.0%)	300	20 (2.0%)	300
20	Max. Voltage Unbalance L-L	20 (2.0%)	300	20 (2.0%)	300
53	End of Incremental Energy Interval	0	0	0	0
55	Power-up Reset	0	0	0	0

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