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By Lanteri A.

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The following illustration shows a three-phase reversing motor circuit. It has one set of forward (F) contacts controlled by the “F” contactor, and one set of reverse (R) contacts controlled by the “R” contactor. F T1 F T2 F T3 L1 L2 L3 R Mechanical Interlocks R R Forward: L1 - T1 L2 - T2 L3 - T3 Reverse: L1 - T3 L2 - T2 L3 - T1 When the “F” contacts are closed, current flows through the motor causing it to turn in a clockwise direction. F T1 F T2 F T3 L1 L2 L3 R Mechanical Interlocks R R Forward: L1 - T1 L2 - T2 L3 - T3 Reverse: L1 - T3 L2 - T2 L3 - T1 57 When the “R” contacts are closed, current flows through the motor in the opposite direction causing it to rotate in a counterclockwise direction.

On large motors the high starting current is reflected back into the power lines of the electric utility, causing lights to flicker and in more serious situations can cause computers to malfunction. S. require reduced-voltage starting on large-horsepower motors. 59 Another potential problem with applying full-voltage starts is the high torque developed when power is first applied to the motor. This can be as high as 175% to 200% of full-load torque on a standard NEMA B type motor. Many applications require the starting torque to be applied gradually.

The proper motor must be selected and correctly connected for the application. In these applications, there are three categories. Constant Torque (CT) Variable Torque (VT) Constant Horsepower (CHP) 55 Separate-Winding There are two basic methods of providing multi-speed control using magnetic starters: separate-winding motors and consequent-pole motors. Separate-winding motors have a separate winding for each speed. The speed of each winding depends on the number of poles. The motor cost is higher than consequent pole, but the control is simpler.

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2-Spanned surfaces of sectional genus six by Lanteri A.


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