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Chapter 4—Metering Capabilities 63230-300-212
Energy Readings April 2001
© 2001 Schneider Electric All Rights Reserved
64
The circuit monitor 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 4–4 lists the energy values the
circuit monitor can accumulate.
The circuit monitor can accumulate the energy values shown in Table 4–4in
one of two modes: signed or unsigned (absolute). In signed mode, the circuit
monitor considers the direction of power flow, allowing the magnitude of
accumulated energy to increase and decrease. In unsigned mode, the circuit
monitor 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 to 000,000 MVARh), or it can be fixed.
See Appendix A—Abbreviated Register Listing on page 127 for the
contents of the registers.
Table 4–4: Energy Readings
Energy Reading, 3-Phase Reportable Range Shown on the Display
Accumulated Energy
Real (Signed/Absolute)
-9,999,999,999,999,999 to
9,999,999,999,999,999 Wh
0000.000 kWh to 99,999.99 MWh and
0000.000 to 99,999.99 MVARh
Reactive (Signed/Absolute)
-9,999,999,999,999,999 to
9,999,999,999,999,999 VARh
Real (In)
0 to 9,999,999,999,999,999 Wh
Real (Out) 0 to 9,999,999,999,999,999 Wh
0000.000 kWh to 99,999.99 MWh and
0000.000 to 99,999.99 MVARh
Reactive (In) 0 to 9,999,999,999,999,999 VARh
Reactive (Out) 0 to 9,999,999,999,999,999 VARh
Apparent 0 to 9,999,999,999,999,999 VAh
Accumulated Energy, Conditional
Not shown on the display. Readings
are obtained only through the
communications link.
Real (In)
0 to 9,999,999,999,999,999 Wh
Real (Out)
0 to 9,999,999,999,999,999 Wh
Reactive (In)
0 to 9,999,999,999,999,999 VARh
Reactive (Out)
0 to 9,999,999,999,999,999 VARh
Apparent
0 to 9,999,999,999,999,999 VAh
Accumulated Energy, Incremental
0000.000 kWh to 99,999.99 MWh and
0000.000 to 99,999.99 MVARh
Real (In) 0 to 999,999,999,999 Wh
Real (Out) 0 to 999,999,999,999 Wh
Reactive (In) 0 to 999,999,999,999 VARh
Reactive (Out) 0 to 999,999,999,999 VARh
Apparent 0 to 999,999,999,999 VAh
Reactive Energy
Not shown on the display. Readings
are obtained only through the
communications link.
Quadrant 1
0 to 999,999,999,999 VARh
Quadrant 2
0 to 999,999,999,999 VARh
Quadrant 3
0 to 999,999,999,999 VARh
Quadrant 4
0 to 999,999,999,999 VARh
Values can be displayed on the screen by creating custom quantities and custom displays.
ENERGY READINGS