doc_PB07B102 Pocket Guide

Glossary

Gyratory crusher – see Crusher, cone.

Hydraulic power pack – A hydraulic pump which is used to supply pressurised hydraulic fluid.

IP rating – a description of the soft starter’s level of physical protection, according to IEC 60529.

Kickstart – a method of soft starting a motor which uses a high level of current for a short period at the beginning of a current limit or current ramp start.

Locked rotor current – the amount of current a motor will draw in locked rotor situations, including full voltage starts. Locked rotor current is described as a percentage of full load current.

Locked rotor time – the maximum amount of time a motor can safely run at locked rotor current.

Locked rotor torque – the amount of torque a motor will produce at locked rotor current (such as a full voltage start). Locked rotor torque is described as a percentage of full load torque.

Mill, ball – a machine which grinds or mixes materials such as ores, chemicals, ceramics and paints. The machine consists of a horizontal cylinder which is rotated, causing the grinding medium, commonly stainless steel balls, to repeatedly crush the material inside into a powder.

Mill, hammer – a machine which crushes material into smaller pieces.

Hammers attached to rotating disks repeatedly strike the material until it is small enough to fall through openings at the bottom of the mill.

Mill, roller – a machine which crushes material into smaller pieces.

Material is passed between two horizontal rollers which rotate in opposite directions, crushing the material into smaller pieces.

Milliscreen – a machine which separates solids from slurry, using an inclined rotating drum with perforated sides.

Mixer – a machine which combines ingredients.

64 VLT ® Soft Starter Pocket Guide

Glossary

Nameplate rating – See Full load current.

NEMA – a description of the soft starter’s physical format, according to the National Electrical Manufacturers’ Association standard.

Pelletiser – a machine which turns powders into pellets.

Planer – a machine which draws boards over a cutting head to reduce them to a specified thickness.

Press – a machine which changes the shape and internal structure of metals (usually steel).

Pump – a machine which moves fluids.

Pump, bore – a submersible pump with a small diameter, suitable for operation down bores.

Pump, centrifugal – a pump with an impeller which causes fluid to rotate and move from the inlet to the outlet under its own momentum.

The fluid’s velocity increases as it progresses through the impeller passage. Diffuser, ring or volute cavities reduce the velocity of the fluid and convert the energy into pressure energy.

Pump, positive displacement – a pump which reduces the volume of the pump chamber to cause the fluid to move. Positive displacement pumps may be used for viscous fluids, and include rotary (lobe, screw or gear pump) and reciprocating (piston or diaphragm pump) types.

Pump, slurry – a centrifugal pump for pumping slurry.

Pump, submersible – a pump which is submerged in the fluid to be pumped. The sealed motor is close-coupled to the pump body.

Pump, vacuum – a pump which removes gas from a sealed chamber in order to create a partial vacuum. Multiple vacuum pumps may be used together for a single application.

Re-pulper – a machine which re-pulps raw product for further processing.

Rotary table – a large rotating table which is used to sort or move material.

VLT ® Soft Starter Pocket Guide 65