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Moco > First Half Second Semester > Flashcards

First Half Second Semester Flashcards

1
Q

Voltage for control

A

+/- 0-10v DC

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2
Q

Taper lock bushing

A

What connects to sprocket

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3
Q

Oscilloscope

A

Visual volt meter

Can read ac/dc signal

Needs iso transformer

1hz = 1 cycle

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4
Q

Motor design in hoist

A

Designed to prevent loss of directional control while reversing motor
-rules out use of single Phase motor

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5
Q

How much of cable sits in groove?

A

2/3rd of cable

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6
Q

Safety Relay

A

Heater, 2 contactor, reversible mechanical interlock w/ contactor

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7
Q

How many connections on potentiometers?

A

3 connections

2 sources of DC

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8
Q

3 parts of deck track

A

Knife
Dog
Receiver

Knife fits in dog
Receiver receives knife as it fits through dog

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9
Q

Alternative to load securing device

A

40:1 gearbox

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10
Q

Safety functions for hoists

A

E stop

Ultimate (over travel) limit switches

End of travel (initial, normal) limit switch

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11
Q

Signal from drive to motor

A

+/- 0-180v DC

+/- determines direction

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12
Q

VFD Path

A

AC -> Bridge rectifier -> DC -> DC Filter (capacitor smoothes out signal) -> high power transistor (high amperage)

Only works on polyphase motor! Needs self-starting, single Phase not self starting!

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13
Q

Spacing b/t grooves

A

Half of 1/16th

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14
Q

What doesn’t ESTA apply to?

A

Flying systems, chain motors, manual powered hoists

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15
Q

Why we use uni power drive?

A

Cheaper than buying bipolar drive

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16
Q

Grommet

A

Cable that wraps around turntable

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17
Q

of LSD in hoist

A

Should have at least 2 load securing device

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18
Q

Peak load

A

Abnormal situations/operations

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19
Q

FAT

A

Field accepted test

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20
Q

What carries load in power screw drive?

A

The nut

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21
Q

Technical spaces

A

Where the general public can’t get access

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22
Q

Enabling device

A

Someone with line of sight holds a button

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23
Q

Category 2 Stop

A

Machines decelerates to stop, power remains

24
Q

Category 1 Stop

A

Machine decelerates to stop, then power removed

25
Q

Competent Person

A

Authorized to take corrective measures to eliminate hazards

26
Q

5-8 risk value

A

Acceptable only if risk is as low as is reasonably practicable

27
Q

1-4 Risk value

A

Acceptable risk

28
Q

How get +/- 0-10v?

A

Use variable resistor to control speed

29
Q

Drawbar

A

Force to move the wagon

Assume 10-15% of load to move it

30
Q

9-25 Risk Value

A

Unacceptable risk

31
Q

Encoders generate

A

Pulses

32
Q

Load carrying device

A

Connects b/t load and lifting media
Clamp
Truss

33
Q

SAT

A

Shop accepted test

34
Q

Minimum tensile strength of Lifting media

A

5x characteristic load
8x static load
1.33x peak load

35
Q

A2D

A

Analog-to-Digital card

Takes analog signal, turns it digital so we can use it with PLC, Computer

Card needs 24 volts for card to work

36
Q

Cable to shackle

A

Size up 1 size from cable to shackle

1/8” cable, 1/4” shackle

37
Q

VFD limitations

A

Cannot work on single Phase ac motor, can’t vary speed

-has be 3 Phase motor

38
Q

Characteristic load

A

Normal operations

39
Q

Positive break operation

A

Can’t rely on springs to break connection

40
Q

Category 0 stop

A

Uncontrolled stop caused by immediate removal of power

Should not cause permanent deformation or failure of any component of system

41
Q

Variable Resistor

A

Resistor that has a movable unit

Pointing left, 10 volts
Pointing down, 5 volts
Pointing right, 0 volts

42
Q

Load securing device can be a ____

A

A brake

43
Q

What is diode

A

Diode is a semiconductor device

44
Q

2 types of brakes

A

Load Brake: mounted on the drum

Motor brake: mounted on the motor

45
Q

Lifting media

A

Wire rope
Chain
What is used to hoist

46
Q

Qualified Person

A

Person with degree, or professional knowledge and training, that can solve problems related to subject matter and work

47
Q

Digital value formula

A

(Volts • 256)/10 volts

48
Q

2 parts of diode

A

Anode +

Cathode -

49
Q

Background color estop

A

Yellow

50
Q

Half wave rectification

A

Diode can block top or bottom half of alternating current

51
Q

Use multimeter to measure

A

Resistance
Voltage

Resistance
Hz/frequency
Amperage

52
Q

Estop

A

Should be cat 0 or cat 1 stop

53
Q

______ controls speed

A

Hertz/frequency outputting from drive controls speed

54
Q

of knives in wagon

A

Typically 2 so we don’t firetruck

55
Q

Absolute encoder

A

Generates a numeric #, control takes # and knows what to do with it

Upper limit ~ 65,000

56
Q

Incremental Encoder

A

Generates pulses

57
Q

Transformer limitation

A

DC cannot go through transformer

Moco (4 decks)

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