SEL-701-1 Monitor
Date Code 20011009
Glossary
RMS -Underfrequency Element
GL.8
RMS
Abbreviation for Root-Mean-Squared. Refers to the
effective value of the sinusoidal current and voltage
measured by the monitor, accounting for the
fundamental frequency and higher order harmonics in
the signal.
ROM
Abbreviation for Read-Only Memory. Nonvolatile
memory where the monitor firmware is stored.
RTD
Abbreviation for Resistance Temperature Device. An
RTD is made of a metal having a precisely known
resistance and temperature coefficient of resistance.
The SEL-701-1 Monitor and SEL-2600 RTD Module
can measure the resistance of the RTD, and thus,
determine the temperature at the RTD location.
Typically embedded in the motor windings or attached
to the races of bearings.
Self-Test
A function that verifies the correct operation of a
critical device subsystem and indicates if an out-of-
tolerance condition is detected. The SEL-701-1
Monitor is equipped with self-tests that validate the
monitor power supply, microprocessor, memory, and
other critical systems.
SEL
OGIC
â
Control Equation
A monitor setting that allows you to control a monitor
function (such as an output contact) using a logical
combination of monitor element outputs and fixed
logic outputs. Logical AND, OR, INVERT, Rising
Edge [/], and Falling Edge [\] operators, plus a single
level of parentheses are available to use in each control
equation setting.
Sequential
Events Recorder
A monitor function that stores a record of the date and
time of each assertion and deassertion of every Relay
Word bit in a user settable list. Provides a useful way to
determine the order and timing of events following a
monitor operation.
SER
Abbreviation for Sequential Events Recorder or the
monitor serial port command to request a report of the
latest 512 sequential events.
Speed Switch
An electrical contact that closes to indicate that a motor
speed exceeds a certain value.
Terminal
Emulation Software
Personal computer (PC) software that can be used to
send and receive ASCII text messages via the PC serial
port, such as Microsoft
â
Hyperterminal
ä
or ProComm
Plus
ä
.
Underfrequency
Element
A protection element that causes the monitor to trip
when the measured electrical system frequency is less
than a user settable frequency.
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