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63230-300-212 Chapter 4—Metering Capabilities
April 2001 Min/Max Values for Real-time Readings
55
© 2001 Schneider Electric All Rights Reserved
The circuit monitor can be set to one of two VAR sign conventions, the
standard IEEE or the ALT (CM1). Circuit monitors manufactured before
March 2000 default to the ALT VAR sign convention.The Series 4000 Circuit
Monitor defaults to the IEEE VAR sign convention. Figure 4–2 illustrates the
VAR sign convention defined by IEEE and the default used by previous model
circuit monitors (CM1). For instructions on changing the VAR sign
convention, refer to “Advanced Meter Setup” on page 34.
Figure 4–2: Reactive Power—VAR sign convention
VAR Sign Conventions
Real
Power
In
Reactive
Power In
Quadrant
1
Quadrant
2
Quadrant
3
Quadrant
4
Reverse Power Flow Normal Power Flow
Real
Power
In
Reactive
Power In
ALT (CM1) VAR Sign Convention IEEE/IEC VAR Sign Convention
(Series 4000 Circuit Monitor Default)
Quadrant
1
Quadrant
2
Quadrant
3
Quadrant
4
Reverse Power Flow Normal Power Flow
watts negative (–)
vars negative (–)
power factor leading (+)
watts negative (–)
vars positive (+)
power factor lagging (–)
watts postive (+)
vars positive (+)
power factor leading (+)
watts positive (+)
vars negative (–)
power factor lagging (–)
watts negative (–)
vars positive (+)
power factor leading (+)
watts negative (–)
vars negative (–)
power factor lagging (–)
watts positive (+)
vars negative (–)
power factor leading (+)
watts positive (+)
vars positive (+)
power factor lagging (–)