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© 2011 Schneider Electric. All Rights Reserved.
63230-500-225A2 PowerLogic
TM
Series 800 Power Meter
3/2011 Glossary
105
Glossary
Terms
accumulated energy—energy can
accumulate 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.
active alarm—an alarm that has been
set up to trigger, when certain
conditions are met, the execution of a
task or notification. An icon in the
upper-right corner of the meter
indicates that an alarm is active (!).
See also enabled alarm and disabled
alarm.
baud rate—specifies how fast data is
transmitted across a network port.
block interval demand— power
demand calculation method for a block
of time. Includes three ways to apply
calculating to that block of time; sliding
block, fixed block, or rolling block
methods.
communications link—a chain of
devices connected by a
communications cable to a
communications port.
current transformer (CT)—current
transformer for current inputs.
demand—average value of a quantity,
such as power, over a specified interval
of time.
device address—defines where the
power meter resides in the power
monitoring system.
disabled alarm—an alarm which has
been configured but which is currently
“turned off”; i.e, the alarm will not
execute its associated task even when
its conditions are met. See also enabled
alarm and active alarm.
enabled alarm—an alarm that has
been configured and “turned on” and
will execute its associated task when its
conditions are met. See also disabled
alarm and active alarm.
event—the occurrence of an alarm
condition, such as Under-voltage Phase
A, configured in the power meter.
firmware—operating system within the
power meter.
fixed block—an interval selected from
1 to 60 minutes (in 1-minute
increments). The power meter
calculates and updates the demand at
the end of each interval.
float—a 32-bit floating point value
returned by a register (see Register List
on page 79). The upper 16-bits are in
the lowest-numbered register pair. For
example, in the register 4010/11, 4010
contains the upper 16-bits while 4011
contains the lower 16-bits.
frequency—number of cycles in one
second.
line-to-line voltages
—measurement of
the rms line-to-line voltages of the circuit.
line-to-neutral voltages
—measurement of the rms line-to-
neutral voltages of the circuit.
maximum demand current—highest
demand current measured in amperes
since the last reset of demand.
maximum demand real power
—highest demand real power
measured since the last rest of
demand.
maximum demand voltage—highest
demand voltage measured since the
last reset of demand voltage.
maximum demand (peak demand)
—highest average load during a
specific time interval.
maximum value—highest value
recorded of the instantaneous quantity
such as Phase A Current, Phase A
Voltage, etc., since the last reset of the
minimums and maximums.
minimum value—lowest value
recorded of the instantaneous quantity
such as Phase A Current, Phase A
Voltage, etc., since the last reset of the
minimums and maximums.