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2. Operate the load. 3. Regulate its speed. 4. Protect itself, including controller and wires. 5. Stop. FIG. 37-STARTER SELECTION GUIDS Part 8. Auxiliary Equipment | Chapter 2. Motors And Motor Controls STARTERS Starter selection is integral with motor selection and should be so considered in relation to the following factors: horse power rating, permissible current, desirable torque, necessary protection and combined economics. An outline of the basic process of selection of available starters is given in Fig.

PURPOSE The purpose of the motor controller is to: 1. Admit electric energy to the motor at a proper rate. 2. Protect against any fault that may occur in the electric system which may cause a sudden inrush of current. 3. Prevent overheating of the motor while operating. 4. Regulate the motor speed. 5. Withdraw electric energy when the need ceases. This discussion gives an insight into the functions of motor starting and protective equipment. The detailed selection of equipment to satisfy given requirements is the responsibility of the electrical engineer.

Ball bearings with numerous component parts moving relative to each other produce many sound frequencies. Rigidity of bearing support is very important. The noise level of both types increases with lubrication impurity and surface roughness appearing in the course of wear and tear. Therefore care must be exercised in the choice of motor enclosure in relation to ambient environment. Although rarely encountered in the air conditioning field, another mechanical noise is brush noise, resulting from the sliding contact of brushes against a slip ring or commutator.

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Carrier Auxiliary Equipment by Carrier company


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