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Comeng Faults > Brake Component Defects > Flashcards

Brake Component Defects Flashcards

1
Q

What does the Charging Valve do?

A

Charges BP to 550kPa

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2
Q

When does Charging Valve operate?

A

At all times except when BCH is in EMERGENCY

When BCH in EMERGENCY it is closed to stop the BP from charging

Charging valve closes - emergency exhaust valve opens

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3
Q

What is the first thing to check if the BP fails to charge when you open BVICS?

A

Check MR to Brake Controller IC is open

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4
Q

If the MR to Brake Controller IC is open and BP fails to charge what do you do?

A

Close it - return to cab

Trip EP CB

Work BCH between RELEASE and EMERGENCY several times

Open MR to Brake Controller IC

Place BCH in RELEASE - should charge

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5
Q

If you are unable to charge the BP what do you do?

A

charge BP on a trailing MC and close BVICS once charged

Need CE. Driver operates train from leading car

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6
Q

With Jammed Charging Valve in leading cab and CE having charged from trailing motor, what brake is available to driver?

A

Only Emergency Brake available

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7
Q

With jammed Charging Valve in leading cab what speed can you do?

A

15kmh

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8
Q

What does the Lock Out Magnet Valve do?

A

When energised by 110vDC via EP CB, it locks out automatic air brake application while EP and Rheo brake is in operation

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9
Q

What can cause the Lock Out Magnet Valve to de-energise?

A

EP CB tripping

Loss of 1500vDC overhead power supply

  • both of these will bring Automatic Air Brake into operation
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10
Q

What happens if the Lock Out Magnet Valve becomes defective in the closed (energised) position?

EXAM

A

No Automatic Air Brake

EP and Rheo brake operational

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11
Q

What happens if the Lock Out Magnet Valve becomes defective in the open (de-energised) position?

A

Simultaneous Automatic Air Brake, EP and Rheo brake

or

All brakes operate

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12
Q

If Lock Out Magnet Valve becomes defective in closed position and no Air Brake is available what does the driver have to do?

A

Operate train on EP and Rheo brake

Max of 15km

De-train passengers

Shunt to first available siding

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13
Q

If Lock Out Magnet Valve becomes defective in open position what does driver do?

A

Run on Air Brake

Submit TMM

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14
Q

What cab equipment controls the Emergency Application Valve?

A

Hand and Foot Pilot valve

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15
Q

What do you have to do if Emergency Application Valve fails to reset?

A

Turn Red EC Cock to isolate position

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16
Q

What equipment is isolated when you turn the Red EC cock?

A

Trip

Emergency Application Valve

Control Governor

Hand and foot pilot valve

Anti-neutralisation device

VICERS Activation valve

17
Q

What makes up the Secondary Safety Equipment?

A

Foot pilot valve

Emergency pilot valve

Emergency Control Gov.

CG bypass push button

18
Q

Once you have turned the Red EC Cock how do you operate the train?

A

Set foot pilot valve

Press CG Bypass button

Allow BP to recharge

  • must press CG bypass button every 30 seconds
19
Q

What does the Release Prevention Valve do?

A

Prevents the Automatic Air Brake from releasing when the BCH is in any position other than RELEASE

20
Q

What brake should you use if you have a defective Release Prevention Valve?

A

Run on EP/Rheo

  • danger is that Air brake will release when you don’t want it to
21
Q

What does the Regulating Valve do?

A

Maintains BP pressure between:

380-410 and 550 (+/-20kPa)

22
Q

How do you establish if you have a defective Regulating valve?

A

If BP charges to less than 550kPa …

Close BVICS …

If BP pressure falls rapidly it indicates leak in BP

If BP pressure does not fall …

BCH to EMERGENCY

Open the BVICS

Release the brake

… if BP pressure rises to its previously low level fault is in Regulating Valve

23
Q

What is the minimum BP pressure you can operate a train?

A

425kPa

run and monitor train

Under 425kPa - train is disabled

24
Q

What should you do if BCH is moving involuntarily towards RELEASE position?

A

Isolate the EP brake and drive using Automatic Air Brake

25
Q

When will Train-lined SPBs automatically apply?

A

When Reverser is placed to OFF

When Reverser is placed to NEUTRAL for 60 seconds

Comeng Faults (11 decks)

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