63230-300-212 Glossary
April 2001
193
© 2001 Schneider Electric All Rights Reserved
GLOSSARY
accumulatedenergy—energy can accumulates
in eithersigned or unsigned (absolute) mode. In
signed mode,the direction of power flow is
consideredand the accumulated energy
magnitudemay increase and decrease. In
absolutemode, energy accumulatesas a positive
regardlessof thepower flow direction.
address—see

device address

. See also

Ethernet address

.
ANSI—American NationalStandards Institute.
baudrate—specifies how fast data is transmitted
acrossa network port.
block interval d emand—power demand
calculationmethod for a block of time and
includesthree ways to apply calculating to that
block of time using the sliding blo ck,f ixed block,
or rolling blockmethod.
coincidentreadings—two readings that are
recorded atthe same time.
command interface—usedto issue commands
such as reset commandsand to manually
operaterelays contained in registers 8000–8149.
communicationslink—a chai n of devices such
as circuit monitorsand power meters that are
connectedby a communications cable to a
communicationsport.
conditionalenergy—energy accumulates only
when a certa in condition occurs .
controlpower—provides power to the circuit
monitor.
crest factor(CF)—crest factor of voltage or
current isthe ratioof peak values to rms values.
current unbalance—percentagedifference
betweeneach phase voltage with respect to the
averageof all phase currents.
CVM—current/voltagemodule that is an
interchangeablepart of the circuit monitor where
all meteringdata acquisition occurs.
default—avalue loaded into the circuitmonitor at
the factorythat you can configure.
demand—averagevalue of a quantity,such as
power,over a specified interval of time.
deviceaddress—defines where the circuit
monitor (orother devices) reside in the power
monitoringsystem.
displacement powerfactor (dPF)—cosine of
the angle betweenthe fundamental components
ofcurrent and voltage, which represents the time
lag between fundamentalvoltage and current.
Ethernet address—aunique number that
identifiesthe device in the Ethernet network and
is alwayswritten as combination of eleven
numbers suchas 199.186.195.23.
event—the occurrenceof an alarm condition,
suchas

UndervoltagePhase A

,configured in the
circuitm onitor.
firmware—operatingsystem within the circuit
monitor
frequency—numberof cycles in one second.
fundamental—valueof voltage or current
correspondingto the por tionof the signal at the
power frequency(50, 60, or 400 Hz).
generic demandprofile—up to 10 quantities on
which any of the de mand calculation s can be
performed (thermal demand,block interval
demand, orsynchronized demand). Two generic
demand profilescan be set up in the circuit
monitor.
harmonic power—differencebetween total
power and fundamentalpower. A negative value
indicatesharm onicpower flow out of the load. A
positivevalue indicates harmonic power flow into
the load.
harmonics—the circuit monitor store s in
registerst he magnitudeand angle of individual
harmonics up to the 63rd harmonic. Distorted
voltagesand currents can be represented by a
series of sinusoidalsignals whose frequencies
are multipliersof some fundamental frequency,
such as 60 Hz.
holding register—registerthat holds the next
valuetobetransmitted.
IEC—InternationalElectrotechnical Commission
incremental energy—accumulatesenergy
during a user-definedtimed interval.
IOX—input/outputextender that is an optional
part of the circuit monitorwhere up to eight
analog or digitalI/O modules can be added to
expandthe I/O capabilities of the circuit monitor.