Deck 12: Sequence Control

Question 1

Figure 12-2


In the circuit shown in the figure above, what prevents motor #2 from starting before motor #1?

Answer 1

A normally open 1M auxiliary contact connected in series with starter coil 2M prevents motor #2 from starting before motor #1.

Question 2

In a circuit in which three motors turn off in sequence, an overload on any one motor will not have an effect on the other motors.

Answer 2

False

Question 3

Figure 12-4


The circuit shown in the accompanying figure permits ____________________ motors to start in sequence.

Answer 3

three,3

Question 4

How do automatic sequence control circuits which sense motor current work?

Question 5

Figure 12-6


In the circuit shown in the figure above, what happens when the STOP button is pressed?

Question 6

Some circuit requirements may demand that the motors turn off in sequence. What does such a circuit require?

Question 7

The addition of two ____________________ make it possible to start motors in sequence from #1 to #3 with a time delay between the starting of each motor as well as stopping the motors in sequence from #3 to #1 with a time delay between the stopping of each motor.

Question 8

Figure 12-4


In the circuit shown in the accompanying figure, motor #3 starts five seconds after motor #____________________ starts.

Question 9

What kinds of machines use sequence control? Give at least one example.

Question 10

Circuits that permit the automatic starting of motors in sequence are rare.

Question 11

Most ladder diagrams show coils connected in parallel.

Question 12

Normally open auxiliary contacts that control the starting sequence are often called permissive contacts because they permit action to take place.

Question 13

Figure 12-4


In the circuit shown in the accompanying figure, timer coil TR1 is connected in ____________________ with the 1M starter coil.

Question 14

____________________ forces motors to start or stop in a predetermined order.

Question 15

Sequence control can be achieved by several methods.