Siemens SIMPRO-100 Instruction Manual page 234

Glossary
G
H
hp
Abbreviation for horsepower. 1 hp = 745.7 W.
I
IA, IB, IC
Measured A-, B-, and C-phase currents.
IG
Residual current, calculated from the sum of
the phase currents. In normal, balanced
operation, this current is very small or zero.
When a motor ground fault occurs, this
current can be large.
IN
Neutral current measured by the relay IN
input. The IN input is typically connected to
the secondary winding of a window-CT for
motor ground fault detection on
resistance-grounded systems.
Instantaneous Meter
Type of meter data presented by the
SIMPRO-100 Relay that includes the present
values measured at the relay ac inputs. The
word "Instantaneous" is used to differentiate
these values from the measurements
presented by the demand, thermal, energy,
and other meter types.
232
J
K
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.
L
Learned Motor Cooling Time
A motor parameter that the SIMPRO-100
Relay can calculate using data collected over
time. In order to calculate Learned Motor
Cooling Time, the relay must be connected to
measure the temperature of an ambient
temperature RTD and at least one RTD
embedded in the motor windings. The relay
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 SIMPRO-100
Relay can calculate using data collected over
time. In order to calculate Learned Starting
Thermal Capacity, the relay 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 relay 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 relay detects the
stopped rotor using a settable overcurrent
element and trips after a settable time-delay.
SIMPRO-100
PRIM-2400C