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Kayla Sewell > Comeng Formative > Flashcards

Comeng Formative Flashcards

1
Q

What is the red ec?

A

Isolates primary safety apparatus in the lead

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2
Q

What is apart of the primary safety apparatus?

A

Trip
Emergency application valve
Control gov
Hand pilot and foot pilot
Anti-neutralisation device
Vicers activation valve

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3
Q

When red ec has been turned what does it introduce as a secondary?

A

Foot operated pilot valve
Emergency pilot valve
Emergency control gov
Control gov bypass button

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4
Q

How often will the cg bypass go off?

A

Every 30 seconds and flash for 10 seconds

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5
Q

When do you use the yellow techav cock?

A

Isolates the safety apparatus on any other m car other than the lead

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6
Q

What is the main res to brake controller used for?

A

When it’s open- it allows main res air to flow to the brake controller when on auto air
Close if there’s a fault

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7
Q

Brake unit- what is variable load valve

A

Monitors air pressure in the air suspension

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8
Q

Brake unit- what is the restricted application limiting valve and ball check valve?

A

Allows a 10% increase in b/c pressure when using air brake above ep brake
Adjust b/c pressure during rheo braking to a holding pressure on m cars only

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9
Q

Brake unit- 7 step relay?

A

Converts electrical signals from brake controller into 7 steps of ep brakes
Controls the flow of main res air to brake cylinders to that car

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10
Q

Brake unit- Restricted application magnet valve?

A

Prevents simultaneous application of ep while rheo braking on m cars only

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11
Q

Brake unit- triple valve?

A

Controls flow of air from:
Bp to aux res
Aux res to brake cylinders
Brake cylinders to atmosphere
(Charge- apply- release)
Main control valve for air braking

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12
Q

Brake unit- what is the general purpose of both release ensuring valve and dump valve?

A

To avoid the possibility of sticking brakes

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13
Q

Brake unit- dump valve?

A

Reduces air pressure in aux res so brakes don’t stick when emy brake is applied over ep

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14
Q

Brake unit- release ensuring valve?

A

Removes 14kpa from aux res when brake controller is in r/r

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15
Q

Brake unit- bypass check valve?

A

Provides a passage for main res air to reach the brake cylinders

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16
Q

Brake unit- hand release valve?

A

A manual release of air pressure on that car during brake defects

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17
Q

What is the purpose of the bvic? (4 items)

A

-main res air to auto air valves and into bp through to the brake cylinders
- electrical current to the ep and rheo brake selector switches in brake controller
-electrical current to the low pressure flag and lock out magnet valve
- electrical current to door monitoring circuits for blue door closed lights

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18
Q

What’s the purpose of the lsm switch?

A

Protection system to reduce the load on substations when overhead power is restored
Also protects 1500vdc equip

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19
Q

What equipment is on the aux c/b

A

Bell
Aux start
Doors release and close
Saloon lights on and off
Couple and uncouple buttons
Aircon #1 control
Rheo local
Self centring device
(First 4 train lined, last 4 not)

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20
Q

If aux c/b trips what happens to saloon lights?

A

They remain in the state they were in

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21
Q

If aux c/b trips what happens to the doors?

A

They will remain in the state they were in
(Door loop bypass to detrain)

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22
Q

If aux c/b trips what happens to the cab bell?

A

Won’t operate

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23
Q

If aux c/b trips what happens to the aux start button?

A

It will fail to remotely start the ma on the trailing motor cars

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24
Q

What equipment is on the control c/b?

A

Master controller
Reverser
Brake (rheo)
Overload reset
Panto lower and raise
Control governor

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25
Q

If the panto raise button is tripping the control c/b what can you do?

A

Locally raise pantos in each car and submit tmm

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26
Q

If the panto lower button is tripping the control c/b what can you do?

A

Reset c/b
Electrically isolate each panto in turn and test individually until faulty one is found
Manually lower and isolate faulty panto
(If this doesn’t isolate fault it’s in train cable or other wiring don’t dock up)

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27
Q

If traction reset is tripping the control c/b what can you do?

A

Find defective motor using this car light
Motors all out

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28
Q

If mc is off, no buttons pressed and brake handle in r/r control c/b trips what do you?

A

Short circuit of control c/b and Mc
C/e to power from other cab or disabled

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29
Q

Control cb trips with brake in the applied position (reverser is on) what do you do?

A

Short circuit on rheo brake demand wire or equip
Isolate rheo and reset
Doesn’t reset- trip ep cb (resets run on air)
Doesn’t c/e or disabled

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30
Q

Control cb trips with brake in the applied position (reverser is on) what do you do?

A

Short circuit on rheo brake demand wire or equip
Isolate rheo and reset
Doesn’t reset- trip ep cb (resets run on air)
Doesn’t c/e or disabled

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31
Q

If the control c/b trips when using master controller what do you do?

A

Short circuit in train cable or traction control equip
Reset c/b try each notch (trips in 4 proceed at lower speed)
Trips straight away - motors all out reset and try for power
If it still trips after
All in and try other cars

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32
Q

If the control c/b is still tripping after isolating motors what’s the next steps?

A

Motors all in reset cb
Divide train test for power in lead portion
If you have traction power attach non electrically
Run on air
If all fails disabled

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33
Q

What is the first thing you check if you can’t obtain traction power?

A

Trip- lowered and reset
switches - blue light and cbs and switches in normal position
gauges- mr 585-725
Bp- 400-430
Control res- 490
cocks- bvic open
Red ec
Yellow techav

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34
Q

If all trips switched gauges and cocks are all correct what is the next thing we check?

A

110vdc power
Supply light
Lp is lowered and ep works
Bell works

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35
Q

When would you perform the robbds test?

A

When you can’t get traction power

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36
Q

What’s the first step of the robbds tests?

A

Reverser- put in reverse and test for amps

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37
Q

Step 2 of robbds test?

A

Overload reset button-
Press the traction overload reset button
Try for power again

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38
Q

Step 3 of robbds test?

A

Brake pipe reduction-
Drop pilot valve below 325 let it restore to above 430 and try again

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39
Q

Step 4 of robbds test

A

Control gov bypass button-
Apply and isolate brake and make sure spb on
Turn red ec
Cut in set foot and press cg bypass button to charge bp

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40
Q

Step 5 of robbds test?

A

Door loop bypass-
Door loop bypass and try for power again

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41
Q

Step 6 of robbds test?

A

Second master controller-
Apply and isolate brake
Spb on
Make a pa, take key and proceed to another m car
Cut in lower trip and try for power

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42
Q

What happens if all those steps fail for robbds test?

A

Train is disabled

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43
Q

Attach and divide- what is the bunch up procedure and how do you uncouple?

A

Cut in lower trip
Release local spb
Run and release
Notch 1 of power
Step 7 of brake
Shut off power and reverser off
Emergency brake
Reverser to neutral
Uncouple buttons

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44
Q

How to isolate a panto?

A

Local panto lower - check
Isolate panto ep cock in van area
Isolate electrical panto switch
Motors all out and rheo
Tmm

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45
Q

What happens if 2 bvics are open?

A

Flashing blue

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46
Q

What is on the plc?

A

Above door 3 every car
Door chimes
Door secondary release
Door open and close buttons
Door delay closing relay
Foot pilot
Fdcl
Control gov bypass light and button
Secondary pilot valve
Doorloop bypass controls

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47
Q

How to isolate a door?

A

Fault warning notice and door not in use stickers
Open pelmet above door
Serrated edge on the inside of the loop
Tie around bolts and micro switch

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48
Q

How can you detect sticking brakes?

A

Smoke and smell
Retardation
B/c gauge
Fault lights

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49
Q

How to fix sticking brakes in running?

A

Trip ep cb
Full service application of air then release
Drive as per normal
Check for smoke or retardation

50
Q

What do you do if you have sticking brakes and are stationary?

A

Make sure air pressures are correct
Rapid succession of ep (step 7 and release)
Apply for minimum power to move train
Shut off and feel for retardation
Rolls freely book as rectified in running

51
Q

If you still have sticking brakes while stationary what is the next steps you can take?

A

Tec call
Pa
RTA
Full cab
Inspect brakes and wheels for excessive heat or smoke
If it’s a bogie isolate and confirm have all released
If bogie continues to vent iso spb and manually release
Book as per fmp
And complete fwn at both ends

52
Q

What are speed restrictions for isolated bogies?

A

More than 80% 10km less of track speed to 60 km/h
50-80% extreme caution
Less than 50% disabled

53
Q

How to isolate a bogie?

A

RTA from tc/signaller
Apply and isolate auto air
Turn bogie iso cock on affected car
Iso spb and manually release
Charge bp and tmm
(Fwn both ends)

54
Q

Speed restriction for locked or skidding wheels?

A

Max of 5km/h to clear section

55
Q

Can you move your train if your lead axle is locked/jammed?

A

No

56
Q

What causes a fdcl?

A

Saloon doors failing to close
Isolated plc in any other car
Open circuit in train cable (can’t fix)
Marker light in wrong position
Coupler sensor is defective (can’t fix)
An aux cb tripped in last motor
A control cb tripped in last motor
Another bvic opened

57
Q

What is the fdcl procedure?

A

Try open and close doors again
Pa announcement
Call tc
Open and close doors again
Full cab (60 seconds for tone)
Go to end cab and check- bvic
Marker lights
Control and aux cb
Walk through saloon and check plcs
Door loop bypass and detrain

58
Q

What is the max amount of doors on each side of all cars that can be isolated and still be in service?

A

1

59
Q

What light will illuminate when door loop has been bypassed?

A

Safety system isolated

60
Q

If one door is defective what is the likely cause?

A

Mechanical (isolate door)

61
Q

If one side of doors on a car are defective what’s the likely cause?

A

Pneumatic or electrical
Check door switches and cbs above door 3
Check door isolating cock (a or b) depending on side

62
Q

If all doors on a car are defective what’s the likely cause?

A

Pneumatic check doors systems or a and b iso cocks

63
Q

If all doors on the train are defective what’s the likely cause?

A

Aux cb has tripped

64
Q

If all doors fail to open what’s the likely cause?

A

Door isolating cock will need to be turned to release doors

65
Q

What’s the procedure if you have main res and bp fall on the gauge?

A

Place brake handle into emergency
Check if you have derailed
Observe mr needle to see if it’s recovering
If so attempt to reset
If not call tc
Rta
Full cab and inspect train

66
Q

What is the minimum bp you need to drive train?

A

425kpa

67
Q

If there is a main res leak in lead do you need a c/e?

A

Yes they will need to open and close bvic to charge bp

68
Q

If you have a main res leak in lead what’s the procedure?

A

Turn mr end cocks
Manually release spb
Lower and isolate lead panto
Motors all out
Move passengers to the t car and lock Comms doors
Iso vicers
Iso doorloop
Release train lined park brakes
Trip comp gov cb
Instruct ce to open bvic and charge then close bvic at 550
Power and brake from lead (only emy available)
(Parm- panto, air comp gov, release spb, motors all out)

69
Q

What items do you lose with main res leak in lead?

A

Whistle
Air bags
Ma inoperative (half saloon lights and half aircon)
Trip (control res empty trip lowered)
Saloon doors
(Whistle at men to strip)

70
Q

How do you drive the train if the mr is in the lead?

A

Max 15km/h
Only brake is emy
Detrain at next location

71
Q

What should the driver do if main resend cock has broken off at the lead motor?

A

Attempt to plug

72
Q

What does the choke fitted at the end pipes do?

A

They allow 550kpa to be maintained by the compressors

73
Q

Main res rupture under any other m car?

A

Locate defect and turn mr end cocks
Manually release spb
Iso panto
Motors all out
Move passengers and lock coms doors
Iso yellow techav (prevents trip lowering)
In the lead-
Open bvic and lower trip
Iso vicers and doors
Trip ep cb
Release train lined park brakes
Tmm

74
Q

What items do you lose with mr leak in any other motor car?

A

Air suspension
Ep brake
Ma
Spb
Local panto
Saloon doors
Control res

75
Q

Mr leak in a trailer car?

A

Find defect
Turn main res end cocks
Remove passengers to next m Cara and lock com doors
Open bvic
Iso vicers and door loop
Trip ep
Release train lined spb
Send tmm

76
Q

What items do you lose in a trailer car?

A

Doors
Air suspension
Ep

77
Q

How would you drive the train in both mr leak in any other m car and trailer car?

A

Half track speed to a max of 30 (air suspension)
Detrain at next location
Auto air

78
Q

Rupture in main res tank?

A

Close mr delivery cocks
Comp contractor iso switch to off
Iso comp gov cb
Return to lead open bvic and lower trip
Tmm
Release spb
Department train as required

79
Q

What can cause a loss of bp pressure?

A

Bp flexible hose coupling or uncoupling
Bp flexible hose coupling
Any trip activating
Van area cock
Emergency application valve operating
Train dividing
Train derailed
Vicers system involuntarily operating
Any rupture of the bp or related piping
Main res pipe or tank rupture

80
Q

Loss of bp first steps

A

Place the brake controller into emy
Attempt to reset any activated trip
Return to r/r
If bp does not charge check pilot valve is set
Reset vicers system
Perform modified cab un attended
Isolate red ec
Operate on secondary
Observe its increasing
If not locate leak

81
Q

How to identify where bp leak is

A

Go to centre and check both local spb are on
isolate both bp end cocks
Enter leading centre open bvic
Charges- trailing unit
Doesn’t charge- lead unit

82
Q

Once you have identified the leak is in trailing unit what’s next steps?

A

Leave trailing centre bvic open in step 7
Walk around the train listening for a leak
Attempt to plug

83
Q

Where must you drive the train from with a bp leak?

A

For the longest portion of continuous bp

84
Q

Bp rupture in cars 1,2 or 3?

A

Drive from any car in trailing unit
Isolate bp end cocks
Release hand wire to dump air
Trip ep and run on air
C/e will operate spb and look at signals
Max speed 15

85
Q

Bp rupture cares 4 or 5

A

Don’t need a c/e
Iso bp end cocks
Release air from hand release wire
Iso mr to 7 step
Open bvic in rear brake handle in r/r
Iso vicers
Lead- open bvic charge bp
Run on ep brakes
C/e run on air and they will charge bp

86
Q

Bp leak in car 6

A

C/e to operate spb
Iso bp end cocks
Run on air
Power and brake from lead

87
Q

What speed will you go in all scenarios of bp rupture?

A

15km/h

88
Q

What does the charging valve do?

A

Allows the passage of main res air to pass via the relay valve to charge the bp

89
Q

When is the charging valve open?

A

All times other than emy

90
Q

How do you know if the charging valve is faulty?

A

Bp is not charging when you open bvics

91
Q

What is the procedure for faulty charging valve?

A

Open bvic
Check mr to bc cock
If it’s open close it
Trip ep
Bc to run and release then emy several times
Open mr to bc
Bc to r/r

92
Q

If bp fails to charge after doing charging defect procedure what’s the next steps?

A

Set ep cb
Step 7 brake
Leave bvic open and ensure spb applied
Open bvic in another m car and charge bp
Cut out
Return to lead and attempt to charge bp

93
Q

What do you do if a charging valve cannot be fixed and still in running?

A

C/e to charge bp from another cab
Max 15 on air brake

94
Q

What does the release prevent valve do?

A

Prevents mr air to the regulating valve when bc is in service zone
Ensures air brake is only release in r/r

95
Q

What does the regulating valve do?

A

Reduces main res pressure to a control pressure of 381-410kpa (full service) and upto 550
Duplicates equalising res and bp by relay valve during braking
Maintains bp at 550 when ep braking
Controls pressure output of the brake controller into all positions except emergency

96
Q

What does the relay valve do?

A

Controls flow of air in and out of bp to a pressure set by equalising res
Relays messages between equalising res to bp during brake applications

97
Q

Lockout magnet valve and ball check valve?

A

When energised prevents auto air and ep being used at the same time( (super brake)
Power supply is governed by 110vdc
Loss of overhead or power will introduce air
Open- super brake closed- emy only

98
Q

Emergency exhaust valve?

A

Vents bp air to atmosphere when emergency brake has been applied
Works in conjunction of charging valve

99
Q

Equalising res?

A

Located beneath cab flow
Air pressure comes from regulating valve
Aids in smoother operation of relay valve when exhausting bp air to atmosphere when air brake application has been made
Allows bp to be charged
If there’s a leak in equalising res it will cause a depletion of the amount of air in bp

100
Q

Control res?

A

Supplies compressed air to operate ep valves in main equipment case
Supplies compressed air to trip latching lever

101
Q

Panto storage res?

A

Supplies compressed air to raise the panto of no main res is available

102
Q

Aux res?

A

Supplies compressed air to brake cylinders when auto air braking

103
Q

Supplementary res?

A

Knorr- motor car
All trailers
Similar to a main res on a m car
Charged with main res air
Supplies air to brake cylinders with all braking

104
Q

Pre control res?

A

Knorr- located behind brake unit
Stores air pressure from main res which has been reduced by the ep pressure valves for operating 7 step relay

105
Q

Main res- what’s attached to it?

A

Control res (traction power)
Saloon doors
Whistle
Panto
Ep brakes
Air bags
Brake controller
Air compressor
Spb

106
Q

What are the 6 cocks in a box?

A

Panto ep
Ma ep
Trip gear
Bp sensor
Panto and ma
Ep mr
Pre menstrual tension blood pissing everywhere

107
Q

Bp operating pressure?

A

550

108
Q

Bp full service reduction
Both bp and bc gauge

A

340-410
275

109
Q

Steps 1 and 2 of ep brake?

A

70 kpa

110
Q

What are the increments of bc of ep brake through all steps?

A

35kpa

111
Q

Ep step 7?

A

245kpa

112
Q

Emergency pressure?

A

275kpa

113
Q

Main res operating pressure?

A

585-725kpa

114
Q

Minimum mr pressure to raise pantos?

A

500kpa

115
Q

Control gov opens pressure?

A

310-340kpa

116
Q

Control gov closes pressure?

A

400-430kpa

117
Q

Control gov test needs to fall below?

A

290kpa

118
Q

Trip test bp pressure needs to fall below?

A

150kpa

119
Q

Continuity pressures?

A

Falls below 300kpa in 15 seconds
Increases to 425 in 40 seconds

120
Q

Safety valve blows off at?

A

775kpa

Kayla Sewell (30 decks)

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