Deck 9: Forward-Reverse Control

Question 1

What would happen if both contactors were energized at the same time?

Answer 1

Having both contactors energized would result in two of the three phase lines being shorted together.

Question 2

____________________ forces one contactor to be de-energized before the other one can be energized.

Answer 2

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Interlocking

Question 3

Electrical interlocking can be accomplished by connecting the normally closed ____________________ contacts on one contactor in series with the coil of the other contactor.

Answer 3

auxiliary

Question 4

Most reversing controllers only contain mechanical interlocks.

Question 5

Four methods of electrical interlocking are available.

Question 6

Figure 9-6

In the accompanying figure, the dashed lines drawn between the push buttons indicate that they are ____________________ connected.

Question 7

How are mechanical interlocks shown in a schematic diagram?

Question 8

Figure 9-12

The accompanying figure shows the components needed to construct a(n) ____________________ control circuit.

Question 9

How can the direction of rotation of any three phase motors be reversed?

Question 10

What does interlocking do?

Question 11

If R coil energizes, all R contacts change position.

Question 12

How is mechanical interlocking accomplished?

Question 13

The motor is connected to the power line regardless of which direction it operates.

Question 14

Magnetic reversing starters generally change T leads ____________________ and ____________________ to reverse the motor.

Question 15

One of the methods of electrical interlocking is accomplished with the use of double-acting push buttons.