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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
35
Energy Readings
The power meter calculates and stores accumulated energy values for real and reactive
energy (kWh and kVARh) both into and out of the load, and also accumulates absolute
apparent energy. Table 4–3 lists the energy values the power meter can accumulate.
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 C—Using the Command Interface
on page 83 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 non-volatile memory.
Table 4–3: Energy Readings
Energy Reading, 3-Phase Reportable Range Shown on the Display
Accumulated Energy
Real (Signed/Absolute)
Reactive (Signed/Absolute)
Real (In)
Real (Out)
Reactive (In)
Reactive (Out)
Apparent
-9,999,999,999,999,999 to
9,999,999,999,999,999 Wh
-9,999,999,999,999,999 to
9,999,999,999,999,999 VARh
0 to 9,999,999,999,999,999 Wh
0 to 9,999,999,999,999,999 Wh
0 to 9,999,999,999,999,999 VARh
0 to 9,999,999,999,999,999 VARh
0 to 9,999,999,999,999,999 VAh
0000.000 kWh to 99,999.99 MWh
and
0000.000 to 99,999.99 MVARh
Accumulated Energy, Conditional
Real (In)
Real (Out)
Reactive (In)
Reactive (Out)
Apparent
0 to 9,999,999,999,999,999 Wh
0 to 9,999,999,999,999,999 Wh
0 to 9,999,999,999,999,999 VARh
0 to 9,999,999,999,999,999 VARh
0 to 9,999,999,999,999,999 VAh
These values not shown on the
display. Readings are obtained
only through the communications
link.
Accumulated Energy, Incremental
Real (In)
Real (Out)
Reactive (In)
Reactive (Out)
Apparent
0 to 999,999,999,999 Wh
0 to 999,999,999,999 Wh
0 to 999,999,999,999 VARh
0 to 999,999,999,999 VARh
0 to 999,999,999,999 VAh
These values not shown on the
display. Readings are obtained
only through the communications
link.
Reactive Energy
Quadrant 1
Quadrant 2
Quadrant 3
Quadrant 4
0 to 999,999,999,999 VARh
0 to 999,999,999,999 VARh
0 to 999,999,999,999 VARh
0 to 999,999,999,999 VARh
These values not shown on the
display. Readings are obtained
only through the communications
link.
➀ Not shown on the power meter display.