Schweitzer Engineering Laboratories SEL-701-1, Instruction Manual

Page: 435 / 452

Date Code 20011009
SEL-701-1 Monitor
Glossary
Instantaneous Meter-Load Profile
GL.5
Instantaneous Meter Type of meter data presented by the SEL-701-1
Monitor that includes the present values measured at
the monitor ac inputs. The word “Instantaneous” is
used to differentiate these values from the
measurements presented by the demand, thermal,
energy, and other meter types.
Key Switch Contact A type of electrical contact that can only be moved
from the open to closed position or back when you
insert the appropriate key and rotate the cylinder.
Learned Motor
Cooling Time
A motor parameter that the SEL-701-1 Monitor can
calculate using data collected over time. In order to
calculate Learned Motor Cooling Time, the monitor
must be connected to measure the temperature of an
ambient temperature RTD and at least one RTD
embedded in the motor windings. The monitor collects
cooling time data for five consecutive motor stops and,
if enabled by your settings, uses that cooling time in
the thermal model.
Learned Starting
Thermal Capacity
A motor parameter that the SEL-701-1 Monitor can
calculate using data collected over time. In order to
calculate Learned Starting Thermal Capacity, the
monitor records the percent of thermal model capacity
used during each of the last five motor starts.
LED Abbreviation for Light-Emitting Diode. Used as
indicator lamps on the monitor front panel.
Load Jam Element A motor protection element that, when enabled, can
trip the protected motor if the rotor stops turning due to
a sudden increase in load torque or decrease in bus
voltage. When the rotor stops, the motor phase current
increases. The monitor detects the stopped rotor using
a settable overcurrent element and trips after a settable
time-delay.
Load Loss Element A motor protection element that, when enabled, can
trip the protected motor if the motor shaft is suddenly
decoupled from the mechanical load. The monitor
detects the sudden decrease in mechanical load using
an undercurrent or underpower element.
Load Profile A function that stores selected monitor measurements
in nonvolatile memory every 15 minutes. The monitor
has enough memory to store at least 30 days of data
before it replaces the oldest record with the newest one.