Question 177Electricity & Electronics - 1st Asst/Chief
70% to passAs shown in the illustration, what is the purpose of the Time Delay (TR) coil in the circuit? Illustration EL-0104
AEnsures the motor cannot be started until the overload relays are reset.
BAllows the motor to come up to speed at reduced voltage before bypassing the starting resistors.
CEnsures the motor cannot be started until the accelerating coil is energized.
DAllows the motor to come up to speed before placing the starting resistors in the circuit.
AI Explanation
The correct answer is B) Allows the motor to come up to speed at reduced voltage before bypassing the starting resistors. The time delay (TR) coil in the circuit serves to delay the bypassing of the starting resistors until the motor has had a chance to come up to speed at a reduced voltage. This ensures a smooth, controlled acceleration of the motor rather than abruptly applying full voltage which could cause issues. The other answer choices are incorrect because they do not accurately describe the purpose of the TR coil in this type of motor control circuit.
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