conditions has occurred on a certain piece of
excess (often damaging) current between these
S W I T C H B O A R D . A single large panel or an
SIGNAL CONDITIONING ENCLOSURE (S/CE).
assembly of panels on which are mounted the
Part of the PAMISE and provides the major
switches, circuit breakers, meters, fuses, and
input interface between the propulsion plant
terminals essential to the operation of electrical
machinery and the ECSS control consoles. The
S/CE accepts inputs from the plant machinery
and outputs normalized signals to the ECSS
TACHOMETER. An instrument used to measure the
control consoles. Also has alarm detection and
speed of rotation of a device.
alarm output circuitry. One S/CE is located in
TEMPERATURE. The quantitative measure of the
each engine room and one is a part of the CISE
relative hotness or coldness of an object.
(located in CCS).
THERMAL ENERGY. The potential and kinetic
SILICON CONTROLLED RECTIFIER (SCR). A
energy of particles of a body which can be evolved
four layer pnpn semiconductor device that, when in
its normal state, blocks a voltage applied in either
THERMOCOUPLE. (1) a bimetallic device capable
direction. The SCR is enabled to conduct in the
of producing an emf roughly proportional to
forward direction when an appropriate signal is
temperature differences on its hot and cold
applied to the gate electrode.
junction ends. (2) A junction of two dissimilar
SOLDERING. The joining of metallic surfaces (e.g.,
metals that produces a voltage when the junction
electrical contacts) by melting a metal or an alloy
(usually tin and lead) over them.
TOLERANCE. The allowable deviation from a
SOLENOID. A coil of wire in the form of a long
specification or standard.
cylinder that resembles a bar magnet. When current
TRANSDUCER. (1) A device that converts a
flows in the wire, a movable core is drawn into the
mechanical input signal into an electrical output
signal. (2) Generally, a device that converts energy
SOLID-STATE. (1) Pertaining to circuits and
from one form into another, always retaining the
components using semiconductors. (2) The physics
characteristic amplitude variations of the energy
of materials in their solid form (e.g., diodes,
SPLIT PLANT. The condition in which only one
more coils, linked by magnetic lines of force, used
engine in an engine room is driving the reduction
to step up or step down an ac voltage.
TURBINE OVERTEMPERATURE PROTEC-
STARTER AIR SYSTEM. Takes both hot
TION SYSTEM (TOPS). A system used on a CG-
compressed bleed air from the bleed air collection
or DD-class ship to protect a surviving generator
and distribution system and cool compressed
from overload if another generator fails.
bleed air from the masker air system and
TURBINE INLET TEMPERATURE (TIT). The
distributes it to both the GTEs and GTGs for
GTGS turbine inlet temperature on the Allison
starting and motoring.
501-K17. (Known as
for an LM2500 GTE.)
ULTRAVIOLET (UV) DETECTOR. A device that
shaft-driven centrifugal compressor mounted on the
senses the presence of fire in the GTE and GTG
end of a diesel engine on the FFG-7 class ships. It
enclosure and generates an electrical signal that is
is used to supply compressed air to the GTEs for the
sent to the ECSS, MCS, or PCS.
purpose of starting.
UNINTERRUPTIBLE POWER SUPPLY (UPS)
STATOR. The nonrotating part of the magnetic
SYSTEM. Critical ship control systems have a
UPS as an emergency power source. The UPS is
SUMMARY ALARM. An indicator at a console that
used to maintain operations during any interruption
of the normal power source.
indicates to an operator that one of several abnormal