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PowerLogic® Series 800 Power Meter
Chapter 4—Metering Capabilities
63230-500-225A1
6/2006
The power meter can accumulate the energy values shown in
Table 4–3 in one of two modes: signed or unsigned (absolute). In
signed mode, the power meter considers the direction of power flow,
allowing the magnitude of accumulated energy to increase and
decrease. In unsigned mode, the power meter accumulates energy
as a positive value, regardless of the direction of power flow. In other
words, the energy value increases, even during reverse power flow.
The default accumulation mode is unsigned.
You can view accumulated energy from the display. The resolution of
the energy value will automatically change through the range of
000.000 kWh to 000,000 MWh (000.000 kVAh to 000,000 MVARh),
or it can be fixed. See Appendix A—Power Meter Register List
on page 121 for the contents of the registers.
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 power meter stores the date
and time of the last reset of conditional energy in nonvolatile memory.
Also, the power meter provides an additional energy reading that is
only available over the communications link:
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Four-quadrant reactive accumulated energy readings. The
power meter accumulates reactive energy (kVARh) in four
quadrants as shown in Figure 4–7. The registers operate in
unsigned (absolute) mode in which the power meter accumulates
energy as positive.
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