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5th Year, Week 2 (Motor Control 3, Intro to PLC) > Motor Control 3 > Flashcards

Motor Control 3 Flashcards

1
Q

What are the 3 types of DC motors?

A
  1. ) Series
  2. ) Shunt
  3. ) Compound
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2
Q

How many SETS of contacts do DC motors utilize?

A

1 Set (2 Contacts)

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3
Q

Rheostats are ____ control devices, meaning a person has to be there to operate it.

A

Manual

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4
Q

How do Rheostats change motor speed?

A

By changing the amount of current to the armature. (To which it is usually wired in series)

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5
Q

____ are a safety feature for maintaining connection after motor speed has reached maximum.

A

Holding Coils

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6
Q

T/F: Contactor starting connects partial voltage when first connected.

A

False, full voltage is connected across the contacts.

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7
Q

____ are segments that cool and separate arcs. Usually 80% of the energy is absorbed.

A

Arc Chutes

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8
Q

A ____ creates a magnetic field that extinguishes the arcs.

A

Blowout Coil

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9
Q

What are 3 ways that drives are better than rheostats>

A
  1. ) No human required to operate
  2. ) Less power to operate
  3. ) Cheaper in the long run
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10
Q

Motor speed monitoring is done with what 2 devices?

A
  1. ) Tachometer

2. ) Encoder

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11
Q

How do you reduce the speed of a DC motor?

A

Reduce Armature voltage

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12
Q

How do you increase the speed of a DC motor?

A

Reduce field winding voltage

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13
Q

What are the two parts of a DC drive?

A
  1. ) Power section

2. ) Control section

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14
Q

How does the control section of a DC drive control motor speed?

A

By quickly switching to dictate how much of the power is delivered to the motor, and when.

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15
Q

___-loop control has motor characteristics pre-programmed into the controller.

A

Open-loop, which is cheaper.

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16
Q

____-loop control uses sensors to monitor motor characteristics, adjusting as needed.

A

Closed-loop

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17
Q

What are the two types of DC motor braking?

Except for Friction Braking

A
  1. ) Dynamic - Braking Resistors

2. ) Regenerative - Back to power source

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18
Q

What is the most common analog range?

A

4-20mA

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19
Q

What are the two reasons that using 4-20mA is the most common analog range?

A
  1. ) Longer range (Current, no voltage drop)

2. ) Less to no issues from electrical noise.

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20
Q

What are the three types of analog signals?

A
  1. ) Current (4-20mA)
  2. ) Voltage (0-5vDC, 1-5vDC)
  3. ) Pressure (3-15PSI)
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21
Q

A ____ converts a signal to one that is more usable by the device.

A

Signal Conditioner

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22
Q

Limit Alarms are also known as ____.

A

Level-Relays

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23
Q

How can you use a 1-5vDC device with a 4-20mA system ?

A

With a 250 Ohm Resistor.

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24
Q

A ____ converts one type of energy to another, usually for reading/signal purposes.

A

Transducer

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25
Q

What are the two parts of a transducer?

A
  1. ) Sensor

2. ) Transmitter

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26
Q

What are the two types of temperature sensors that vary resistance with temperature?

A
  1. ) RTD

2. ) Thermistor

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27
Q

What are the 2 types of temperature sensors that produce a small voltage when heated?

A
  1. ) Thermocouples

2. ) Solid State Temperature Sensors

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28
Q

Wires coming off of a thermocouple must be as short as possible to mitigate voltage drop, so they are usually ran to a nearby ____.

A

Reference block.

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29
Q

What are the 3 Position Sensing devices?

A
  1. ) Linear Potentiometers
  2. ) Rotary Potentiometers
  3. ) LVDT (Movable Core)
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30
Q

What are the 6 Pressure Sensor types mentioned in the book?

A
  1. ) Deflection
  2. ) Differential
  3. ) Bourden Tube
  4. ) Piezoelectric
  5. ) Direct (Strain Gauge + Load Cell)
  6. ) Solid State
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31
Q

What are the 6 types of Flow sensors that the book mentions?

A
  1. ) Paddle Wheel
  2. ) Turbine
  3. ) Vortex
  4. ) Electromagnetic
  5. ) Ultrasonic
  6. ) Mass (Thermal + Coriolis)
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32
Q

A Vortex-type flow sensor contains a component called the ____ which contacts the liquid to create vortices, which are utilized for measuring flow.

A

Bluff-Body

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33
Q

Ultrasonic-type flow sensors utilize ____ in the fluid they are reading, for receiving sound waves back.

A

Particulates

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34
Q

Current Sinking, NPN or PNP?, switch on the positive or negative side?

A

Sinking = NPN = switches on the Negative side.

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35
Q

Current Sourcing, NPN or PNP?, switch on the positive or negative side?

A

Sourcing = PNP = switches on the positive side.

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36
Q

How is an AC/DC input module able to utilize AC power?

A

Because it has Reverse parallel diodes.

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37
Q

T/F: TTL input modules are heavy duty.

A

True

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38
Q

What are the 4 types of input modules?

A
  1. ) Current Sinking
  2. ) Current Sourcing
  3. ) AC/DC
  4. ) TTL
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39
Q

What are the 3 types of output modules?

A
  1. ) DC Output (Current sinking)
  2. ) AC Output (Uses Triacs)
  3. ) TTL
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40
Q

T/F: Grounds should go elsewhere other than the drive, so any possible fault current or ESD stays away from the boards.

41
Q

What does ESD stand for?

A

Electrostatic Discharge

42
Q

Most “smart” or Solid State devices have ____-diagnostic capabilities.

A

Self-diagnostic

43
Q

____(s) give absolute control of a motor through modulation, use much less energy than older starting technologies and are cheaper in the long run

44
Q

T/F: VFD’s allow control of motor speed, torque, direction, and stopping.

45
Q

What are some things to consider when SELECTING a VFD for installation?

A
  1. ) Speed desired
  2. ) Torque
  3. ) Direction
  4. ) Stopping
  5. ) Horsepower Rating
46
Q

The feedback loop from speed sensors is a(n) ____ type signal, and it cannot be run with power feeds to motor.

47
Q

____(s) act like isolation transformers to mitigate harmonics put out by the VFD during the course of modulation.

A

Line reactors

48
Q

T/F: It isn’t important to consider power quality before installing a VFD.

49
Q

____(s) protect the VFD from the elements and also protect personnel from coming into contact with energized parts.

A

Enclosures

50
Q

T/F: Wiring connections aren’t very important.

51
Q

T/F: The motor must be grounded to the VFD’s internal grounding terminal.

52
Q

There are four main areas to check for issues when troubleshooting a VFD, what are they, in-order?

A
  1. ) Inputs
  2. ) Outputs
  3. ) Program
  4. ) Internal Components
53
Q

A ____ is an industrial-grade computer, with one dedicated purpose or chore.

54
Q

What is the most common programming language that is used with PLC’s?

A

Ladder-Logic

55
Q

In what ways are PLC’s and PC’s similar?

A
  1. ) Processors
  2. ) Memory
  3. ) Motherboard
  4. ) Expansion Slots
56
Q

How are PLC’s and PC’s different?

A

PLC’s are not pre-programmed, nor do they have removable storage media.

57
Q

What are the three ways to program a PLC?

A
  1. ) PC
  2. ) Buttons on the unit
  3. ) Handheld programmer
58
Q

What program does the Allen-Bradley SLC 500 ‘family’ of PLC’s operate on?

A

RS Logix500

59
Q

____ PLC’s aren’t able to be modified, all inputs and outputs are already built in.

A

Stand-alone

60
Q

T/F: The MicroLogix 1000 is a standalone unit.

61
Q

The ____ is the box or cabinet that the rack (chassis) is mounted to.

62
Q

What is the metal rail that the processor/power supply and I/O modules are mounted on in a modular PLC system?

A

The Rack, or Chassis

63
Q

What are the three types of OUTPUT signals?

A
  1. ) Analog
  2. ) Discrete
  3. ) Digital
64
Q

T/F: Regular I/O modules can be used for stepper and servo motors.

65
Q

____ manufacturing produces consumables such as food, gas, paint, paper, and chemicals.

A

Process manufacturing

66
Q

____ manufacturing produces durable goods such as automobiles, fridges, and components used in larger and smaller products.

A

Discrete Parts Manufacturing

67
Q

T/F: Synchronous motors have no slip.(After they are brought up to speed)

68
Q

T/F: Induction motors are more expensive than synchronous motors.

A

False, synchronous are more expensive because they can be more precisely controlled.

69
Q

____ motors are best suited for Direct Drive, High Horsepower, or Low RPM Loads.

A

Synchronous

70
Q

What are the 2 phases of synchronous motor starting?

A
  1. ) Start-Up

2. ) Attaining Synchronous Speed

71
Q

____ motors use discrete inputs (Electronic Digital Pulses) to position the motor. This can be done clockwise or counter-clockwise with very precise control.

72
Q

What is stepping rate?

A

The maximum amount of steps in one second.

73
Q

What is Step Angle?

A

The amount of rotation per pulse.

74
Q

What is Holding torque?

A

The maximum load torque with the stator energized.

75
Q

What is Detent Torque?

A

The maximum load torque with the stator de-energized.

76
Q

A ____ is a motor similar to a stepper motor, but with a feedback loop for monitoring exactly how much the shaft has rotated, so corrections can be made.

A

Servo-motors.

77
Q

A ____ Network is a group of locally connected machines in a company building or group of buildings.

A

Enterprise

78
Q

A ____ is used as a data highway within an enterprise network.

A

LAN (Local Area Network)

79
Q

A ____ network links branch offices and single mobile users to a local enterprise network or the internet.

80
Q

A ____ network is comprised of connected enterprise networks.

81
Q

What are the 4 types of network cabling discussed in the book?

A
  1. ) UTP
  2. ) STP
  3. ) Coax
  4. ) Fiber
82
Q

A ____ is a multiport repeater, similar to a signal booster

83
Q

____ are also called “Network Media” and are the physical path on which electrical and optical signals travel.

84
Q

____(s) are high power workstations with a specific purpose.

85
Q

A ____ connects a device to the network.

A

Interface Card.

86
Q

____(s) are devices such as printers, plotters, fax machines, and backup devices.

A

Peripherals

87
Q

What is an HMI and what does it do?

A

Human-Machine-Interface, and it is the medium between human operators and the device/system. Displays system parameters and allows an operator to make changes.

88
Q

What are 4 things to consider when selecting Network Media?

A
  1. ) Range
  2. ) Bandwidth
  3. ) Noise Immunity
  4. ) Cost
89
Q

Unshielded Twisted Cable (UTP), which is used for most ethernet wiring, is divided into 6 different designations (ratings) what are they?

A 
CAT3
CAT4
CAT5
CAT5E
CAT6
CAT7
90
Q

What are the three Network Topologies?

A
  1. ) Bus - Central Network Media
  2. ) Ring - Connected in loop shape
  3. ) Star - One Central Cluster and hub.
91
Q

Ethernet consists of what 3 parts?

A
  1. ) Physical Cable
  2. ) Network Rules
  3. ) Standard Data Packet
92
Q

____ is a medium level control network for automation. It does NOT carry device power.

A

Control-Net

93
Q

____ is the lowest level of base integration devices. It carries the device power in the same cable.

A

Device-Net

94
Q

Cable ____(s) prevent the data in the cable from reflecting back off of the end points of the cable.

A

Terminators

95
Q

What is the six step troubleshooting sequence?

A
  1. ) Define the Problem
  2. ) Decide what needs to be tested
  3. ) Decide what type of test should be performed
  4. ) Correct the Problem
  5. ) Verify Correct Operation
  6. ) Determine the cause of failure
96
Q

____ diagrams use rectangles to identify parts of a system.

97
Q

Signal flow is divided into ____ and ____.

A

Power and Information

98
Q

What are the 5 Line types in a block diagram?

A
  1. ) Linear
  2. ) Convergent
  3. ) Divergent
  4. ) Feedback
  5. ) Switched Path
99
Q

____ is a four step method to work your way down to the issue.

A

Information Funneling

5th Year, Week 2 (Motor Control 3, Intro to PLC) (2 decks)

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