As shown in the illustration, what is the...

🔍 Key Concepts

• Trace how the TR (time delay) coil is wired in the control circuit relative to the M (main contactor) coil and the 1A (accelerating) coil. • Think about how a primary-resistor or reduced-voltage starter works: when are the resistors in the circuit, and when are they bypassed? • Notice which contact (labeled TR or 1A) must change state after a delay, and what that does to the current path through the starting resistors.

💭 Think About

• Follow the sequence: you press Start → which coil energizes first, and what path does current take to the motor? • After the TR coil times out and its contact changes, which device (M, TR, or 1A) is affected, and how does that change the motor’s supply voltage? • Compare choices A and D: in each, are the starting resistors in the circuit during acceleration or after the motor is already at speed? Which matches how this circuit actually behaves?

✅ Before You Answer

• Verify whether the TR contact in the control circuit is in series with the 1A coil (so that 1A operates only after a delay). • Check in the power diagram whether 1A contacts are associated with shorting out or bypassing the resistors in each line, or with inserting them. • Confirm the correct sequence: Start → motor at reduced/full voltage → time delay expires → resistors inserted or removed. Make sure your chosen option matches this sequence.

As shown in the illustration, what is the purpose of the Time Delay (TR) coil in the circuit? Illustration EL-0104

Allows the motor to come up to speed at reduced voltage before bypassing the starting resistors.

Ensures the motor cannot be started until the overload relays are reset.

Ensures the motor cannot be started until the accelerating coil is energized.

Allows the motor to come up to speed before placing the starting resistors in the circuit.

🔍 Key Concepts

💭 Think About

✅ Before You Answer