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4th Year > Reversing Motors > Flashcards

Reversing Motors Flashcards

1
Q

What is the industry standard for reversing a 3 phase motor

A

Interchange L1 and L3

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2
Q

How do you reverse the rotation of a single phase motor

A

By interchanging the leads of the starting or running windings

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3
Q

How do you reverse the rotation of DC series shunt and compound motors

A

By reversing the direction of current through the field without changing the direction of current through the armature or vice versa

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4
Q

What is a drum switch

A

A manual switch made up of moving contacts mounted on an insulated rotating shaft

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5
Q

The industry standard is to reverse the direction of current through the____

A

Armature

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6
Q

What is the only difference between manual and magnetic reversing starters

A

The addition of forward and reverse coils and the use of Auxiliary contacts

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7
Q

The power circuit includes…

A

The incoming circuit main power, the motor starter, and the motor.

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8
Q

The control circuit includes…

A

The required circuit inputs, motor starter coils, motor starter auxiliary contacts, overload contacts, timers, counters, and any other device designed to operate in the control circuit.

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9
Q

List the 4 basic methods of motor control

A

Direct hard wiring, hard wiring using terminal strips, PLC wiring, and electric motor drive wiring

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10
Q

Which is the oldest and most straight forward motor control wiring?

A

Direct hard wiring

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11
Q

What is the disadvantage of direct hard wiring?

A

Troubleshooting and circuit modification are time consuming

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12
Q

____is a method of motor braking in which motor connections are reversed so that the motor develops countertoque that acts as a braking force.

A

Plugging

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13
Q

List 4 types of motor braking

A
  1. Friction Brakes
  2. Plugging
  3. Electric braking
  4. Dynamic Braking
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14
Q

_____is a method of braking on which a dC voltage is applied to the stationary windings of a motor after the AC voltage is removed.

A

Electric Braking

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15
Q

A motor cannot be used for _____ if it cannot be reversed at full speed.

A

Plugging

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16
Q

High current and high heat result from_____ a motor to stop.

A

Plugging

17
Q

List two advantages of friction brakes

A
  1. Low initial cost

2. simplified maintenance (but require more maintenance than other braking methods)

18
Q

_____ is a method of motor braking in which a motor is reconnected to act as a generator immediately after it is turned off.

A

Dynamic Braking

19
Q

_____braking is usually applied to DC motors.

A

Dynamic

20
Q

_____ are often used along with dynamic braking in applications that require the load to be held.

A

Electromechanical friction brakes

21
Q

A ____ is a switching device that has no contacts and switches entirely my electronic means.

A

Solid State Relay

22
Q

Three advantages of solid state electronics

A
  1. Declining cost
  2. High reliability
  3. immense capability
23
Q

Three parts of an SSR circuit

A
  1. input circuit
  2. control circuit
  3. output (load switching) circuit
24
Q

The ____ is the part of an SSR that determines when the output component is energized or deenergized.

A

Control circuit

25
Q

SSRs can be connected in series or parallel

True or False

A

True

26
Q

A________ is an SSR that turns on the load when the control voltage is applied and the voltage at the load crosses zero.

A

Zero Switching Relay

27
Q

The _____ is the most widely used relay.

A

Zero switching Relay

28
Q

A_______ relay is an SSR that turns on the load immediately when the control voltage is present.

A

Instant On Switching Relay

29
Q

_____ relays are designed to control inductive loads.

A

Instant-on

30
Q

List 4 SSR switching methods

A

1.Zero Switching
2.Instant On
3.Peak
4 .Analog

31
Q

A _____switching relay is an SSR that turns on the load when the control voltage is present and the voltage ar the load is at its peak.

A

Peak

32
Q

An ____ switching relay is an SSR that has an infinite number of possible output voltages within the rated range of the relay.

A

Analog

33
Q

____switching allows for a ramp-up function of the load.

A

Analog

34
Q

____ switching relays are designed for closed loop applications.

A

Analog

35
Q

The performance of an SSR is affected by_____.

A

Ambient temperature

36
Q

_____is a method of motor braking in which the regenerated power of a DC motor is returned to the input power supply.

A

Regenerative braking

37
Q

Motor speed is controlled by controlling the ____ to a DC motor.

A

Voltage

4th Year (13 decks)

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