Electrical Power Systems Technology

430 Electrical Power Systems Technology Figure 16-5 shows a circuit that is another method of motor-jogging control. This circui ...

Operational Power Control Systems 431 top pushbutton will momentarily close, and the lower pushbutton will momentarily open. Whe ...

432 Electrical Power Systems Technology Figure 16-9 shows a circuit that is another method of forward-re- verse-stop control. Th ...

Operational Power Control Systems 433 ling a single-phase motor is shown in Figure 16-10. Note that a magnetic contactor relies ...

434 Electrical Power Systems Technology than during normal operation. Motor-starting equipment should attempt to reduce starting ...

Operational Power Control Systems 435 apply full voltage to the motor. Notice that a step-down transformer is used for applying ...

436 Electrical Power Systems Technology Figure 16-12. Primary resistance starter circuit (Courtesy Furnas Electric Co.) ...

Operational Power Control Systems 437 rent control. When the motor has accelerated to near its normal operating speed, the autot ...

438 Electrical Power Systems Technology Figure 16-13. Autotransformer starter circuit used with a three-phase motor (Courtesy Fu ...

Operational Power Control Systems 439 Figure 16-14. Wye-to-delta three-phase starter circuit (Courtesy Furnas Electric Co.) ...

440 Electrical Power Systems Technology Part-winding Starting—Figure 16-15 shows the part-winding starting method, which is usua ...

Operational Power Control Systems 441 part of the parallel-connected motor windings, thus reducing starting cur- rent. Once the ...

442 Electrical Power Systems Technology Forward and Reverse Operation of Motors Most types of electrical motors can be made to r ...

Operational Power Control Systems 443 changes the phase sequence applied to the motor. A control circuit for three-phase inducti ...

444 Electrical Power Systems Technology Dynamic Braking When a motor is turned off, its shaft will continue to rotate for a shor ...

Operational Power Control Systems 445 such as electric drills, sewing machines, electric mixers, and industrial ap- plications. ...

446 Electrical Power Systems Technology quency. Frequency converters are motor/generator sets that are connected together, or so ...

Operational Power Control Systems 447 PROGRAMMABLE LOGIC CONTROLLERS (PLCS) For a number of years, industrial control was achiev ...

448 Electrical Power Systems Technology mable logic controllers (PLCs). These devices have capabilities that far exceed the olde ...

Operational Power Control Systems 449 control application. Mini-PLCs, in general, can achieve the same control functions as the ...