Chapter 4—Metering Capabilities 63230-300-212
EnergyReadings Ap ril 2001
©200 1 Schneider Electric All Rights Reserved
64
Thecircuit monitor calculates and stores accumulated energyvalues for real
andreactive energy (kWh and kVARh)both into and out of the load, and also
accumulatesabsolute apparent energy.Table4–4 lists the energy values the
circuit monitorcan accumulate.
The circuitmonitor can accumulate the energy values shownin Table 4–4in
oneof two modes: signed or unsigned (absolute).In signed mode, the circuit
monitor considersthe direction of power flow, allowingthe magnitude of
accumulatedenergy to increase and decrease.In unsigned mode, the circuit
monitor accumulatesenergy as a positive value, regardlessof the direction
of powerflow. In other words, the energyvalue increases, even during
reversepower flow. The defaultaccumulation mode is unsigned.
Youcan view accumulated energy fromthe display. The resolution of the
energyvalue will automatically change throughthe range of 000.000 kWh to
000,000M Wh (000.000to 000,000 MVARh), or it can be fixed.
See Appendix A—AbbreviatedRegister Listing on page 127 for the
contents ofthe registers.
Table 4 –4: EnergyReadings
Energy Reading, 3-Phase Reportable Range Shownon the Display
Accumulated Energy
Real (Signed/Absol ute) -9,999,999,999,999 ,999 to
9,999,999,999,999,999 Wh 0000.000 kWhto 99,999.99 MWh and
0000.000to 99,999.99 MVARh
Reactive (Signed/Abso lute) -9,999,999,999,999,999 to
9,999,999,999,999,999 VARh
Real (In) 0 to 9,999,9 99,999,999,999 Wh
Real(Out) 0 to 9,999,999,999,999,999Wh
0000.000kWh to 99,999.99MWh and
0000.000 to 99,999.99 MVARh
Reactive(In) 0 to 9,999,999,999,999,999VARh
Reactive(Out) 0 to 9,999,999,999,999,999VARh
Apparent 0 to 9,999,999,999,999,999VAh
Accumulated Ener gy,Condit ional
Notshown on the display.Readings
are obtainedonly throughthe
communications link .
Real (In) 0 to 9,999,9 99,999,999,999 Wh
Real(Out) 0 to 9,999,999 ,999,999,999 Wh
Reactive(In) 0 to 9,999,999,99 9,999,999 VARh
Reactive(Out) 0t o 9,999,999,999,999,999 VARh
Apparent 0to 9,999 ,999,999,999,999 VAh
Accumulated Ener gy,Increm ental
0000.000kWh to 99,999.99MWh and
0000.000 to 99,999.99 MVARh
Real (In) 0 t o 999,999,999,999 W h
Real(Out) 0 to 999,999,999,999Wh
Reactive (In) 0 to 9 99,999,999,999 VARh
Reactive(Out) 0 to 999,999,999,999VARh
Apparent 0 to 999,999,999,99 9 VAh
Reactive Energy
Notshown on the display.Readings
are obtainedonly throughthe
communications link .
Quadrant1 0 to 999,999,999,99 9 VARh
Quadrant2 0 to 999,999,999,99 9 VARh
Quadrant3 0 to 999,999,999,99 9 VARh
Quadrant4 0 to 999,999,999,99 9 VARh
Values can be displayed on the screen by creat ing custom quantities and cu stom displays.
ENERGY READINGS