Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . MOTOR StartingRheostat. DYNAMO~~7/ Shu-at Field-?Rheostat Shunt Field KSiSmSL ^-M Fig. 378.—Connections of a Shunt Motorto a Dynamo Circuit. 410 PRACTICAL ELECTRICITY. box, and when arm, S, rests on point 5 it is held there by theelectromagnet against the action of the spring. The advantageof this arrangement is, that if for any reason the main powersupply circuit should be interrupted, the starting box armwill automatically open the circuit and shut the motor down,instead of permitt
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . MOTOR StartingRheostat. DYNAMO~~7/ Shu-at Field-?Rheostat Shunt Field KSiSmSL ^-M Fig. 378.—Connections of a Shunt Motorto a Dynamo Circuit. 410 PRACTICAL ELECTRICITY. box, and when arm, S, rests on point 5 it is held there by theelectromagnet against the action of the spring. The advantageof this arrangement is, that if for any reason the main powersupply circuit should be interrupted, the starting box armwill automatically open the circuit and shut the motor down,instead of permitting the motor armature to cause a short-circuit across the mains when the power is again turned on. Shunt motors should be started with the driven load dis-connected, it being switched on to the motor when the maxi-mum speed is attained. In starting a shunt motor always besure that the fields are first excited (test their attractive powerwith a penknife), since without the field excitation the arm-ature could not generate a counter E. M. F., but would takean excessive current from the line. The resistance and the self-inducti
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