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© 2011 Schneider Electric. All Rights Reserved.
63230-500-225A2 PowerLogic
TM
Series 800 Power Meter
3/2011 Chapter 4—Metering Capabilities
29
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 4–2
illustrates 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 4–1: Power factor min/max example
1.00
.4
.4
.6
.8
.6
.8
+0
.2
-0
.2
LSD110165
Minimum
Power Factor
-.7 (lagging)
Range of Power
Factor Value
Unity
Maximum
Power Factor
.8 (leading)
Lead
(+)
Lag
(–)
NOTE: Assumes a positive power flow
Figure 4–2: Power factor sign convention
Figure 4–3: Power Factor Display Example
Real
Power
In
watts negative (–)
vars positive (+)
power factor (–)
watts positive (+)
vars positive (+)
power factor (+)
watts negative (–)
vars negative (–)
power factor (–)
watts positive (+)
vars negative (–)
power factor (+)
IEC Power Factor Sign Convention
Reverse
Power Flow
Normal
Power Flow
Reactive
Power In
Quadrant
2
Quadrant
1
Quadrant
3
Quadrant
4
watts negative (–)
vars positive (+)
power factor (+)
watts positive (+)
vars positive (+)
power factor (–)
watts negative (–)
vars negative (–)
power factor (–)
watts positive (+)
vars negative (–)
power factor (+)
Reactive
Power In
Real
Power
In
IEEE Power Factor Sign Convention
Reverse
Power Flow
Normal
Power Flow
Quadrant
2
Quadrant
1
Quadrant
3
Quadrant
4
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=
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The power
factor sign is
visible next to
the power
factor reading.