Schneider Electric PM850, PM870, PM820, PM810 manual Power Factor Sign Conventions, Real

63230-500-225A2					PowerLogicTM Series 800 Power Meter
3/2011					Chapter 4—Metering Capabilities
	Figure 4–1: Power factor min/max example
	Minimum		Range of Power	Maximum
	Power Factor			Power Factor
	-.7 (lagging)		Factor Value	.8 (leading)
			Unity
			1.00	.8
			.8
		.6		.6
	Lag	.4		.4	Lead
	(–)				(+)
		.2		.2

SD110165

-0+0

NOTE: Assumes a positive power flow

An alternate power factor storage method is also available for use with analog outputs and trending. See “Using the Command Interface” on page 83 for the applicable registers.

Power Factor Sign Conventions

The power meter can be set to one of two power factor sign conventions: IEEE or IEC. The Series 800 Power Meter defaults to the IEEE power factor sign convention. Figure 4–2illustrates the two sign conventions. For instructions on changing the power factor sign convention, refer to “ADVAN (Advanced) Power Meter Setup Features” on page 19.

Figure 4–2: Power factor sign convention

Reactive

Power In

		Quadrant	Quadrant
	2		1
watts negative (–)			watts positive (+)
vars positive (+)			vars positive (+)
power factor (–)			power factor (+)
		Reverse	Normal	Real
		Power Flow	Power Flow
				Power
watts negative (–)			watts positive (+)	In
vars negative (–)			vars negative (–)
power factor (–)			power factor (+)
		Quadrant	Quadrant
3			4

Reactive

Power In

			Quadrant	Quadrant
		2		1
	watts negative (–)			watts positive (+)
	vars positive (+)			vars positive (+)
	power factor (+)			power factor (–)
			Reverse	Normal	Real
			Power Flow	Power Flow
					Power
	watts negative (–)			watts positive (+)	In
	vars negative (–)			vars negative (–)
	power factor (–)			power factor (+)
			Quadrant	Quadrant
3				4

IEC Power Factor Sign Convention

IEEE Power Factor Sign Convention

Figure 4–3: Power Factor Display Example

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The power factor sign is visible next to the power factor reading.

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