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63230-300-212 Chapter 4—Metering Capabilities
April 2001 Energy Readings
65
© 2001 Schneider Electric All Rights Reserved
For conditional accumulated energy readings, you can set the real, reactive,
and apparent energy accumulation to
OFF or ON when a particular condition
occurs. You can do this over the communications link, using a command, or
from a digital input change. For example, you may want to track accumulated
energy values during a particular process that is controlled by a PLC. The
circuit monitor stores the date and time of the last reset of conditional energy
in nonvolatile memory.
Also, the circuit monitor provides an additional energy reading that is only
available over the communications link:
• Four-quadrant reactive accumulated energy readings. The circuit
monitor accumulates reactive energy (kVARh) in four quadrants as shown
in Figure 4–7. The registers operate in unsigned (absolute) mode in which
the circuit monitor accumulates energy as positive.
NOTE: The reactive accumulated energy is not affected by the VAR sign
convention and will remain as shown in the image below.
Figure 4–7: Reactive energy accumulates in four quadrants
Real
Power
In
Reactive
Power In
Quadrant
1
Quadrant
2
Quadrant
3
Quadrant
4
Reverse Power Flow Normal Power Flow
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 (–)