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Exam 13: Three-Wire Motor Control

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Question 1

True/False

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Three-wire motor control circuits have three control circuit wires between the motor starter and the control device(s).

A) True
B) False

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Question 2

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Once the motor starter contactor control coil is energized, and being held energized by the holding contacts, pressing the normally closed Stop pushbutton will de-energize the control coil; causing the contactor holding contacts to open.

A) True
B) False

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Question 3

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Stop pushbuttons are normally closed contact configurations.Why?

Permanent contact control devices are called-out as either normally open or normally closed.

_______________ contacts are a normally-open set of contacts mounted on the contactor portion of the motor starter, and are actuated by the armature of the contactor unit.

Three-wire motor control circuits are called three-wire, because there are three _______________ circuit wires between the motor starter and the control device(s).

What does inhibit and enable contacts mean?

The second device in the motor control ladder diagram run is the ____ pushbutton.

Normally closed contact devices on ladder rungs are sometimes called ____ contacts or devices.

The normally closed Stop pushbutton is wired as the third control component in the ladder rung, so that it has master control over the entire rung.

When the ____ pushbutton is pressed, the control circuit power will pass through to the motor starter contactor control coil S1.

Once the motor starter contactor is energized and closes the holding contacts, the holding contacts provide a redundant electrical path around the normally open Start pushbutton contacts, to keep the contactor control coil energized.

The ____ pushbutton will always be the first device off of L1, so that it has "master control" of the rung.

When control circuit power is first applied to the three-wire motor control circuit, the rails become ____.

One of the other names of holding contacts is ____ contacts.

____ contact control devices change states when acted upon, but then return to their original state when released.

Three-wire control circuit components may be either maintained contact or momentary contact, but the _______________ contact function is specific to three-wire control.

When control devices are connected in parallel, they form the Boolean "_______________" function.

Normally closed contact devices on ladder rungs are sometimes called "exhibit" contacts or devices.

Normally open contact devices on ladder rungs and are sometimes called ____ contacts.