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VLT ® Soft Starter Pocket Guide 55
Glossary
AC53 Utilisation Code – The specifi cation of a soft starter’s current
rating at intended operating conditions.
Auger – a device which uses a screw-like mechanism to move material
or liquid, similar to the process that drives shavings up a drill bit and
out of a hole during drilling.
Blower – see Fan, Axial.
Bow thruster – a steering mechanism in large ships which uses an im-
peller to force water through a tunnel in the bow below the waterline,
causing the ship to turn.
Centrifuge – a machine which separates materials of diff erent densi-
ties (e.g. solids from liquids or liquids from liquid mixtures).
Chipper – a machine which cuts large pieces of wood into chips.
Compressor, centrifugal – a machine which accelerates gas through
a housing then converts the velocity energy to pressure energy.
Normally used in heavy industrial applications.
Compressor, positive displacement – see Compressor, reciprocating.
Compressor, piston – see Compressor, reciprocating.
Compressor, reciprocating – a machine which compresses gas using
pistons driven by a crankshaft. Small reciprocating compressors (up
to 30 HP) are suitable for intermittent use and are commonly found in
automotive applications. Larger units (up to 1000 HP) may be used for
large industrial applications.
Compressor, screw – a machine which forces gas into a smaller space,
using two meshed rotating positive displacement screws.
Crusher – a machine which crushes material into smaller pieces.
Crusher, cone – a crusher consisting of two cones inside each other.
Material is fed into the top of the large, outer cone and is broken into
progressively smaller pieces by the rotation of the inverted inner cone.