As shown in the illustrated electrically...

Question 1 / 2066636eed28f7522a1c51db16

Question 1 of 2066636eed28f7522a1c51db16

As shown in the illustrated electrically operated watertight door controller, how is the rotation direction of the door motor reversed? Illustration EL-0115

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Question 1 of 20

66636eed28f7522a1c51db16

As shown in the illustrated electrically operated watertight door controller, how is the rotation direction of the door motor reversed? Illustration EL-0115

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🔍 Key Concepts

• DC motor reversing – what happens if you reverse current in only the armature, only the field, or both? • In a series-wound DC motor, armature and field are in series and normally see the same current direction. • Look at the schematic: which contacts (labeled O and C) actually swap the connections to the motor terminals when you press OPEN vs CLOSE?

💭 Think About

• When you want a DC motor to reverse, do you need to change the direction of the magnetic field, the armature current, or the relationship between the two? • If the contactors simply interchange the two supply leads going to the armature but leave the field connected the same way, what does that do to the rotation? • If both the field and armature polarities are reversed together, does the direction of rotation change or stay the same?

✅ Before You Answer

• Trace the circuit from the supply to the door motor terminals in the OPEN condition and then in the CLOSE condition – which pair of leads are swapped? • Identify whether the field winding is being reversed, the armature is being reversed, or both together. • Remember: reversing both field and armature together does NOT change rotation; only changing ONE relative to the other does.

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Question 1 of 20

As shown in the illustrated electrically operated watertight door controller, how is the rotation direction of the door motor reversed? Illustration EL-0115

reversing the direct current direction through the motor series field and maintaining the same direct current direction through the motor armature

reversing the direct current direction through the motor armature and maintaining the same direct current direction through the motor series field

reversing the direct current direction through the motor series field and the motor armature

reversing the direct current direction through the motor armature and maintaining the same direct current direction through the motor shunt field

Question 1 / 2066636eed28f7522a1c51db16

Question 1 of 2066636eed28f7522a1c51db16

As shown in the illustrated electrically operated watertight door controller, how is the rotation direction of the door motor reversed? Illustration EL-0115

Back

Question 1 of 20

66636eed28f7522a1c51db16

As shown in the illustrated electrically operated watertight door controller, how is the rotation direction of the door motor reversed? Illustration EL-0115

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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