Comeng Faults Flashcards by Joshua Blake

Three locational Areas Faults occur?

Maintenance Examination
From a Siding
While in service

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Fault Identification Methods are

Sight
Hearing
Touch
Smell

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Fault Categories are?

Maintenance Faults
Serious Fault
Critical Fault
Rectified in Running
Re-Marshalled

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When are Fault Warning Notices are used ?

Bogies Isolated

Air Bag Deflated

Lateral sway Fault

Red ec/yellow TECHAV isolated on lead/trail motor

Doors Isolated

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What are some Whistle Defects ?

Sounding Continuously
Not Sounding
Tone too Low

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What are the Initial Checks for the ROBBDS?

Trip
Switches
Gauges
Cocks

Ensure 110v DC supply available

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The ROBBDS test includes:

R- Reverser
O-Traction Overload
B-Brake Pipe Reduction
B- Control Governor Bypass
D- Door Loop Bypass
S-Second Controller

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What % of braking that is not available will the train be declared disabled?

50%

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High Compressor Governor pressure ?

725 ( +- 20 ) kpa

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Low Compressor Governor Pressure is ?

585 kpa

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Main res Safety Valve pressure is ?

775 kpa

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What does putting the Brake Controller into emergency do ?

Closes the Charging Valve

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Main Reservoir Defect in a Trailer Cab are ?

Doors
Air suspension
EP BRAKE

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Main Reservoir Defect in a Trailing Motor are ?

Panto
Air control Governor c/B
Release Park Brake
Motors out
Air Brake
Yellow cock

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Main Reservoir Defect in a Lead Motor are

Whistle
Emergency Brake

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What does the Door Loop Bypass do?

Enables traction power regardless of the state of the doors

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What are the Fault lights connected to the Traction System ?

Local Fault light
Line Switch fault light
This Car light

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What are some causes of traction Faults?

Control reservoir Faults
Pneumatic leaks
Traction overloads tripping
1500 v DC failure
Circuit breaker Failures

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What are the Traction cut out switch positions?

All In (normal)
1&2 Out
3&4 Out
All Out

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Steps for restarting the Motor Alternator?

Pressing the traction equipment reset button

Locally stopping + starting the inoperative motor Alternator

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What brake pipe pressure cant be maintained that will declare the train disabled ?

425 kpa

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What will Low control reservoir prevent?

It prevents the line breakers from closing and that the motor will not power

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What are some 1500v DC EQUIPMENT?

Motor Alternator
Associated circuits
Traction equipment
Compressors
Pantographs

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What is the control Reservoir pressure ?

490 kpa

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What items will help you identify you have DC Supply ?

Bell is operational Low pressure flag is lowered EP BRAKE is operational

What are some AC Power items ?

-Illumination of non emergency saloon lights -illumination of the Van area light

How will you know that you need to reset the emergency lighting ?

Battery charger light will flash

How do you reset the emergency lighting ?

Turn market light switch from Auto to another position then back

What is the Speed Threshold?

8km

How long is the LSM time delay ?

4 minutes to zero when a BVICS has been closed

How long is the Vicers Battery back up timer ?

5 minutes before activation

How should you isolate the Pantograph?

Electronically (switch) Pneumatically (Van tap)

What does a Weak Substation output cause ?

Reduced Tractive effort Reduced Rheostatic brake performance Loss of One or more Air conditioners Loss of one or more Motor Alternators

When does the local fault light illuminates?

Overload has tripped on a motor car

What does a Line switch fault light mean?

Line breaker has failed to close on that motor

Rheo brake fault light means?

Indicates a Rheo brake has failed to set up correctly on that motor car

Wheel-slip fault light means

If in motion it indicates a difference in speed of greater than 15km between axles on one motor car or trailer during powering and braking

Defective control circuit supplies 110v dc for

Master controller and reverser Electric brake demand circuit Traction equipment reset button Remote pantograph raise button Remote Pantograph lower button

What are reasons for isolating a Pantograph ?

Damaged Pantograph or carbon strip Faulty 1500v DC equipment on the train Control circuit breaker short circuit

What does a Motor Alternator do?

Provides Auxiliary power to train Converts 1500vDC POWER-into 415v AC and supplies the 100v DC supply light

What does the Auxiliary Circuit breaker Protect?

Bell Aux Doors Saloon lights Couple & Uncouple Air Con #1 Rheo (local) Scharfenberg self centred

What are the three main reasons of loss of brake pipe Pressure ?

Operation of Safety equipment (trips,HPV etc) Failure of equipment Involuntary activation of equipment (back tripping)

How do you reset the Vicers?

Stationary Master controller to "0" Place brake controller handle in emergency (brake pipe 25kpa) Wait 10 seconds Press vicers acknowledge button Brake controller to Run & Release to charge brake pipe

When does the lock out Magnet valve becomes de-energised ?

Loss off Power

What does a Charging Valve do?

Allows the passage of Main Reservoir air to pass via the relay valve to charge the brake Pipe

When is the only time the Charging valve is closed ?

When the Brake controller is in Emergency

What are defects on the Lock Out Magnet Valve ?

Open position: Simultaneous Automatic Air Brake and E/P Rheostatic Brake Applications Closed: No Automatic Air Brake

What is the train lined spring park brake protected by ?

Compressor Governor circuit breaker

What are Skidding Wheels caused by ?

Heavy break applications Sticking brakes Mechanical Failure such ad a seized traction motor

How many Amps does the Rheostatic brake Draws ?

100-250 amps

How can you identify a second BVICS is open ?

Flashing Blue Door Light DDU message

What are the Brake Controller Components?

Charging Valve Emergency Exhaust Valve Lock out magnet valve Release Prevention Valve Regulating Valve Relay Valve

How can you detect sticking brakes ?

Retardation of the Train Smoke and odour Observation of the brake cylinder gauges Illuminated fault lights

If there is insufficient air pressure in the control Reservoir, what effect is ln that train?

The line Breakers on that car would may not close or close slowly

What does the Uncouple Isolate cock serve ?

Isolates the flow of main reservoir air to the Pneumatic uncouple Buttons

If there was a fault somewhere on the Rheostatic demand Circuit which circuit breaker would trip?

Control Circuit Breaker

How many times will the overhead system automatically attempt to reset itself ?

Twice

If all Overhead power is lost what will happen to The Doors ?

They will release

What does LSM mean?

Loss of Overhead Shutdown Module

What are the components of the LSM?

Time Delay Relay Speed Threshold

When will the LSM activate?

When overhead power has been lost. Once the output of the motors local MA drops below 95vDC for 2 continuous seconds

If a control circuit breaker trips whilst the master controller is closed what could be the reason as to why?

Master controller defect Train cable defect Reverser equipment defect Traction power control defect Rheo brake demand

What is the LSM time delay when the BVICS is closed ?

4 minutes

What are Locked or Jammed wheels caused by?

Seizure of traction Motor Brake rigging/head failures Axle box failure Mechanical fault