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Moco > First Half Second Semester > Flashcards

First Half Second Semester Flashcards

(57 cards)

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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

Study These Flashcards
A

Machines decelerates to stop, power remains

24
Q

Category 1 Stop

Study These Flashcards
A

Machine decelerates to stop, then power removed

25
Competent Person
Authorized to take corrective measures to eliminate hazards
26
5-8 risk value
Acceptable only if risk is as low as is reasonably practicable
27
1-4 Risk value
Acceptable risk
28
How get +/- 0-10v?
Use variable resistor to control speed
29
Drawbar
Force to move the wagon Assume 10-15% of load to move it
30
9-25 Risk Value
Unacceptable risk
31
Encoders generate
Pulses
32
Load carrying device
Connects b/t load and lifting media Clamp Truss
33
SAT
Shop accepted test
34
Minimum tensile strength of Lifting media
5x characteristic load 8x static load 1.33x peak load
35
A2D
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
Cable to shackle
Size up 1 size from cable to shackle 1/8” cable, 1/4” shackle
37
VFD limitations
Cannot work on single Phase ac motor, can’t vary speed | -has be 3 Phase motor
38
Characteristic load
Normal operations
39
Positive break operation
Can’t rely on springs to break connection
40
Category 0 stop
Uncontrolled stop caused by immediate removal of power Should not cause permanent deformation or failure of any component of system
41
Variable Resistor
Resistor that has a movable unit Pointing left, 10 volts Pointing down, 5 volts Pointing right, 0 volts
42
Load securing device can be a ____
A brake
43
What is diode
Diode is a semiconductor device
44
2 types of brakes
Load Brake: mounted on the drum Motor brake: mounted on the motor
45
Lifting media
Wire rope Chain What is used to hoist
46
Qualified Person
Person with degree, or professional knowledge and training, that can solve problems related to subject matter and work
47
Digital value formula
(Volts • 256)/10 volts
48
2 parts of diode
Anode + | Cathode -
49
Background color estop
Yellow
50
Half wave rectification
Diode can block top or bottom half of alternating current
51
Use multimeter to measure
Resistance Voltage Resistance Hz/frequency Amperage
52
Estop
Should be cat 0 or cat 1 stop
53
______ controls speed
Hertz/frequency outputting from drive controls speed
54
of knives in wagon
Typically 2 so we don’t firetruck
55
Absolute encoder
Generates a numeric #, control takes # and knows what to do with it Upper limit ~ 65,000
56
Incremental Encoder
Generates pulses
57
Transformer limitation
DC cannot go through transformer

Moco (4 decks)

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