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Class 235 > Comeng Faults > Flashcards

Comeng Faults Flashcards

1
Q

Three locational Areas Faults occur?

A

Maintenance Examination
From a Siding
While in service

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2
Q

Fault Identification Methods are

A

Sight
Hearing
Touch
Smell

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3
Q

Fault Categories are?

A

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

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4
Q

When are Fault Warning Notices are used ?

A

Bogies Isolated

Air Bag Deflated

Lateral sway Fault

Red ec/yellow TECHAV isolated on lead/trail motor

Doors Isolated

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5
Q

What are some Whistle Defects ?

A

Sounding Continuously
Not Sounding
Tone too Low

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6
Q

What are the Initial Checks for the ROBBDS?

A

Trip
Switches
Gauges
Cocks

Ensure 110v DC supply available

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7
Q

The ROBBDS test includes:

A

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

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8
Q

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

A

50%

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9
Q

High Compressor Governor pressure ?

A

725 ( +- 20 ) kpa

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10
Q

Low Compressor Governor Pressure is ?

A

585 kpa

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11
Q

Main res Safety Valve pressure is ?

A

775 kpa

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12
Q

What does putting the Brake Controller into emergency do ?

A

Closes the Charging Valve

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13
Q

Main Reservoir Defect in a Trailer Cab are ?

A

Doors
Air suspension
EP BRAKE

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14
Q

Main Reservoir Defect in a Trailing Motor are ?

A

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

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15
Q

Main Reservoir Defect in a Lead Motor are

A

Whistle
Emergency Brake

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16
Q

What does the Door Loop Bypass do?

A

Enables traction power regardless of the state of the doors

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17
Q

What are the Fault lights connected to the Traction System ?

A

Local Fault light
Line Switch fault light
This Car light

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18
Q

What are some causes of traction Faults?

A

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

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19
Q

What are the Traction cut out switch positions?

A

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

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20
Q

Steps for restarting the Motor Alternator?

A

Pressing the traction equipment reset button

Locally stopping + starting the inoperative motor Alternator

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21
Q

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

A

425 kpa

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22
Q

What will Low control reservoir prevent?

A

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

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23
Q

What are some 1500v DC EQUIPMENT?

A

Motor Alternator
Associated circuits
Traction equipment
Compressors
Pantographs

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24
Q

What is the control Reservoir pressure ?

A

490 kpa

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25
Q

What items will help you identify you have DC Supply ?

A

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

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26
Q

What are some AC Power items ?

A

-Illumination of non emergency saloon lights

-illumination of the Van area light

27
Q

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

A

Battery charger light will flash

28
Q

How do you reset the emergency lighting ?

A

Turn market light switch from Auto to another position then back

29
Q

What is the Speed Threshold?

A

8km

30
Q

How long is the LSM time delay ?

A

4 minutes to zero when a BVICS has been closed

31
Q

How long is the Vicers Battery back up timer ?

A

5 minutes before activation

32
Q

How should you isolate the Pantograph?

A

Electronically (switch)
Pneumatically (Van tap)

33
Q

What does a Weak Substation output cause ?

A

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

34
Q

When does the local fault light illuminates?

A

Overload has tripped on a motor car

35
Q

What does a Line switch fault light mean?

A

Line breaker has failed to close on that motor

36
Q

Rheo brake fault light means?

A

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

37
Q

Wheel-slip fault light means

A

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

38
Q

Defective control circuit supplies 110v dc for

A

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

39
Q

What are reasons for isolating a Pantograph ?

A

Damaged Pantograph or carbon strip

Faulty 1500v DC equipment on the train

Control circuit breaker short circuit

40
Q

What does a Motor Alternator do?

A

Provides Auxiliary power to train

Converts 1500vDC POWER-into 415v AC and supplies the 100v DC supply light

41
Q

What does the Auxiliary Circuit breaker Protect?

A

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

42
Q

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

A

Operation of Safety equipment (trips,HPV etc)

Failure of equipment

Involuntary activation of equipment (back tripping)

43
Q

How do you reset the Vicers?

A

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

44
Q

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

A

Loss off Power

45
Q

What does a Charging Valve do?

A

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

46
Q

When is the only time the Charging valve is closed ?

A

When the Brake controller is in Emergency

47
Q

What are defects on the Lock Out Magnet Valve ?

A

Open position: Simultaneous Automatic Air Brake and E/P Rheostatic Brake Applications

Closed: No Automatic Air Brake

48
Q

What is the train lined spring park brake protected by ?

A

Compressor Governor circuit breaker

49
Q

What are Skidding Wheels caused by ?

A

Heavy break applications

Sticking brakes

Mechanical Failure such ad a seized traction motor

50
Q

How many Amps does the Rheostatic brake Draws ?

A

100-250 amps

51
Q

How can you identify a second BVICS is open ?

A

Flashing Blue Door Light
DDU message

52
Q

What are the Brake Controller Components?

A

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

53
Q

How can you detect sticking brakes ?

A

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

54
Q

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

A

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

55
Q

What does the Uncouple Isolate cock serve ?

A

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

56
Q

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

A

Control Circuit Breaker

57
Q

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

A

Twice

58
Q

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

A

They will release

59
Q

What does LSM mean?

A

Loss of Overhead Shutdown Module

60
Q

What are the components of the LSM?

A

Time Delay Relay
Speed Threshold

61
Q

When will the LSM activate?

A

When overhead power has been lost.

Once the output of the motors local MA drops below 95vDC for 2 continuous seconds

62
Q

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

A

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

63
Q

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

A

4 minutes

64
Q

What are Locked or Jammed wheels caused by?

A

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

Class 235 (18 decks)

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