Schneider Electric 4000 manual Glossary, 193

63230-300-212	Glossary
April 2001

GLOSSARY

accumulated energy—energy can accumulates in either signed or unsigned (absolute) mode. In signed mode, the direction of power flow is considered and the accumulated energy magnitude may increase and decrease. In absolute mode, energy accumulates as a positive regardless of the power flow direction.

address—seedevice address. See also Ethernet address.

ANSI—American National Standards Institute.

baud rate—specifies how fast data is transmitted across a network port.

block interval demand— power demand calculation method for a block of time and includes three ways to apply calculating to that block of time using the sliding block, fixed block, or rolling block method.

coincident readings—two readings that are recorded at the same time.

command interface—used to issue commands such as reset commands and to manually operate relays contained in registers 8000–8149.

communications link—a chain of devices such as circuit monitors and power meters that are connected by a communications cable to a communications port.

conditional energy—energy accumulates only when a certain condition occurs.

control power—provides power to the circuit monitor.

crest factor (CF)—crest factor of voltage or current is the ratio of peak values to rms values.

current unbalance—percentage difference between each phase voltage with respect to the average of all phase currents.

CVM—current/voltage module that is an interchangeable part of the circuit monitor where all metering data acquisition occurs.

default—a value loaded into the circuit monitor at the factory that you can configure.

demand—average value of a quantity, such as power, over a specified interval of time.

device address—defines where the circuit monitor (or other devices) reside in the power monitoring system.

displacement power factor (dPF)—cosine of the angle between the fundamental components of current and voltage, which represents the time lag between fundamental voltage and current.

Ethernet address—a unique number that identifies the device in the Ethernet network and is always written as combination of eleven numbers such as 199.186.195.23.

event—the occurrence of an alarm condition, such as Undervoltage Phase A, configured in the circuit monitor.

firmware—operating system within the circuit monitor

frequency—number of cycles in one second.

fundamental—value of voltage or current corresponding to the portion of the signal at the power frequency (50, 60, or 400 Hz).

generic demand profile—up to 10 quantities on which any of the demand calculations can be performed (thermal demand, block interval demand, or synchronized demand). Two generic demand profiles can be set up in the circuit monitor.

harmonic power—difference between total power and fundamental power. A negative value indicates harmonic power flow out of the load. A positive value indicates harmonic power flow into the load.

harmonics—the circuit monitor stores in registers the magnitude and angle of individual harmonics up to the 63rd harmonic. Distorted voltages and currents can be represented by a series of sinusoidal signals whose frequencies are multipliers of some fundamental frequency, such as 60 Hz.

holding register—register that holds the next value to be transmitted.

IEC—International Electrotechnical Commission

incremental energy—accumulates energy during a user-defined timed interval.

IOX—input/output extender that is an optional part of the circuit monitor where up to eight analog or digital I/O modules can be added to expand the I/O capabilities of the circuit monitor.

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