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Comeng Faults > General > Flashcards

General Flashcards

1
Q

What are the initial checks undertaken when traction power cannot be obtained?

A

Trips, Switches, Gauges and Cocks

TRIPS
-trip is lowered and set

SWITCHES
-Switches are in their normal position
-Circuit breakers are in normal position
-Door closed button is activated

GAUGES
-Main res pressure within tolerance (585-725)
-Brake pipe air pressure within tolerance 550 (above 425)
-Control reservoir pressure within tolerance (above 490)

COCKS
-BVICS is open
-Red EC and Yellow TECHAV are in normal position

Ensure 110vDC by:
-LP flag is lowered, EP brake operational
-Bell operates

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2
Q

What does the ROBBDS test stand for?

A

R- Reverser
O- traction Overload reset
B- Brake pipe reduction
B- control governor Bypass
D- Door loop bypass
S- Second controller

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3
Q

Step 1 in ROBBDS test?

A

REVERSE

Check if train powers in reverse
If it does, it indicates a faulty reverser

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4
Q

Step 2 in ROBBDS test?

A

OVERLOAD RESET BUTTON

Press the Traction Overload Reset button
Will reset any overloaded or resettable equipment

If train powers, proceed and submit a TMM

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5
Q

Step 3 in ROBBDS test?

A

BRAKE PIPE REDUCTION

-Make a brake pipe reduction below 325 to open control gov
-Restore brake pipe to above 430 to close control gov

Try for power
If train powers, the control governor was faulty (debris most likely)
Proceed and book TMM

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6
Q

Step 4 in ROBBDS test?

A

CONTROL GOVERNOR BYPASS BUTTON

-Turn Red EC
-Set foot pilot valve and press control gov bypass button

If train powers, something on primary safety circuit was faulty

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7
Q

Step 5 in ROBBDS test?

A

DOOR LOOP BYPASS

-Isolate Door Loop Bypass switch and try for power

If power is obtained, fault is in traction inhibit system

Submit TMM and DETRAIN passengers at next opportunity

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8
Q

Step 6 in ROBBDS test?

A

SECOND CONTROLLER

-Try for power at rear cab

If train powers, can be powered from rear with competent employee
Or return to rear

If traction cannot be obtained, declare train disabled

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9
Q

What is a Local fault light usually to do with?

A

An overload

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10
Q

What is the Line Switch fault light usually to do with?

A

The Traction motors

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11
Q

What does a This Car illuminate light indicate?

A

-That one of the fault lights illuminated is for this motor car

-Park brakes are applied

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12
Q

What does the Control Reservoir do?

A

Gives traction power

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13
Q

What is the pressure of the Control Reservoir?

A

490kPa (+-20)

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14
Q

What is the result of a rupture in the Control Reservoir, or the relevant isolating cocks being isolated?

A

The switches will remain open and traction power will be unavailable on that car

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15
Q

If the Control Reservoir is ruptured or isolated, what must be done to gain traction power?
(Line switch fault light)

A

The Traction motor Cut out switch must be put to ‘All out’ and a TMM submitted

The Rheo brake on that car will then need to be isolated to resolve a ‘Rheo’ fault light (caused by the isolated traction motors)

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16
Q

If Traction motors are isolated (either all out, 1&2 or 3&4) what must be done after isolating them?

A

Press the Overload reset button before testing for power

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17
Q

Can a drive reinstate the Main Isolation Switch at any time?

A

No

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18
Q

If overhead is lost, what must be done?

A

-Stop train safely
-Check train is not derailed (if it is, check for fouled lines)
-Contact Train controller
-Secure the train

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19
Q

What is powered directly by 1500v DC?

A

-Pantographs
-Motor Alternators
-Compressors
-Traction equipment
-Associated circuits

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20
Q

When a loss of overhead occurs, how many times will the overhead system try to reset itself?

A

Twice

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21
Q

What happens to the doors if overhead power is lost?

A

They will release

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22
Q

If overhead power is lost and unable to be restored, metrol will make a group call instructing drivers to lower pantographs
What must a driver do?

A

-Observe the rear of the train confirming the trailing pantographs have lowered (lowered by LSM)
-Press the Local MA EP stop valve
-Press the Local Pantograph EP Stop valve

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23
Q

If overhead is lost, all trains have lowered their pantographs, and then power is restored, how will the train controller instruct drivers?

A

TC will deal with one train at a time, and depart them at one minute intervals

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24
Q

If a train fails and communication is unavailable, should the drive immediately assume a loss of overhead has occurred?

A

No, follow fault finding procedures
(Trip, Switches, Gauges, Cocks)

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25
Q

What things tell a driver that 110v DC is present?

A

-Bell is operational
-Low pressure flag is down
-EP brake is operational

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26
Q

How does a driver check for the presence of 240v AC power?

A

-Illumination of non-emergency saloon lights
-Illumination of the van area cab light
-Operation of the headlights

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27
Q

If overhead power has been restored, but no communication is available, what are the wait times before applying traction?

How must the train be driven?

A

UP train- 30 seconds

DOWN train- 60 seconds

Drive in SERIES until the next station, then resume normal operation
Contact Train controller at earliest opportunity

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28
Q

If overhead power is lost and there is a suspicion of a disarranged overhead, what must be done?

A

-Do NOT exit the cab
-Make regular PA announcements to keep passengers on the train

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29
Q

If 1500v is lost and the Emergency lights turn on, how long will they run for before they need to be reset?
How are they reset?

A

Run for 2 hours

Battery charger light will flash to indicate a reset is required

To reset, turn marker light toggle switch from auto to any other position, and then back to auto

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30
Q

How long will the PA remain operational if overhead power is lost?
How it is reset?

A

Up to two hours
Will reset with the emergency lighting

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31
Q

What is the purpose of the LSM?
(Loss of Overhead Shutdown Module)

What does it do?

A

To reduce the impact of 1500v DC defects from overloading the substation when power is returned

It will switch off certain circuits to prevent overloading the substation

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32
Q

What is the LSM Speed Threshold?

A

Set to 8km
LSM will take defined actions if the speed is under or over 8km

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33
Q

If overhead power is lost and the 110v DC output drops to 95v DC for 2 continuous seconds, while the BVICS is open and train is travelling above 8km, what will happen?

A

The LSM will operate

EP circuit breaker will trip (flag will rise)
Motor alternator will shutdown, but the contractor will remain set to ON

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34
Q

When the BVICS are closed on trailing motors, the train is stationary or moving under 8km, timers are at zero, what will the LSM do?

A

-Leading pantograph will be raised
-Trailing pantographs will be lowered
-Leading motor alternator contractor will be ON
-Trailing MA contractors will be OFF

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35
Q

If overhead is lost, what is the timer set to for the VICERS?
What will happen when it expires?

A

5 minutes

VICERS Activation Valve will open, all Brake Pipe air will exhaust to atmosphere

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36
Q

If overhead power is restored when all trains have lowered pantographs, how does the train controller determine which train if defective and caused it?

A

Works with the trains one by one
Each driver to raise all pantographs and start all MA’s
When power is lost again, the defective train is identified

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37
Q

Once a certain motor car has been determined as the reason for an overhead outage, how is the 1500v DC equipment on that car isolated?

A

-Lower the local pantograph using the local EP valve

-Isolate the pantograph electrically and pneumatically (elec= toggle switch, pneu=van cock)

-Turn the motor cut-out switch to ‘All out’

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38
Q

Do trains cause substations to short?

A

Yes

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39
Q

What does a LOCAL fault light indicate?

A

An overload has tripped on a motor car

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40
Q

What does a LOCAL fault light together with a THIS CAR fault light indicate?

A

An overload has tripped on this motor car

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41
Q

What kind of fault is a LINE SWITCH fault light usually associated with?

A

A fault related to the traction motors
A line breaker has failed to close

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42
Q

What does a RHEO BRAKE fault light indicate?

A

A rheostatic brake has failed to set up correctly on a motor car

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43
Q

What does a AIR COND fault light and a THIS CAR fault light indicate together?

A

An air conditioning fault on that motor car

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44
Q

What does a steady AIR COND light indicate?

A

No more than one air conditioner has failed on any one car

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45
Q

What does a flashing AIR COND fault light indicate?

A

At least one car has BOTH the air conditioners inoperative

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46
Q

What does a WHEEL SLIP fault light indicate while stationary?

A

There is a fault in the wheel slip unit and its associated equipment

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47
Q

What does an illuminated WHEELSLIP light indicate when the train is in motion?

A

A difference in speed of greater than 15km between axles on one motor car or trailer car during powering or braking

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48
Q

What equipment does the CONTROL circuit breaker supply 110v DC current to?
(So they can operate)

A

-Master controller and Reverser
-Traction equipment reset button
-Remote pantograph raise and lower buttons
-Electric brake demand circuit (Rheo)

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49
Q

Will a train fail if the CONTROL circuit breaker on the leading motor trips?

A

Yes

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50
Q

When the CONTROL circuit breaker trips, what must be done?
Why?

A

The cause of the fault must be determined and isolated
The operation of the master controller will be effected, and the train cannot be driven from the leading motor

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51
Q

If the CONTROL circuit breaker trips after using the Remote Panto Raise button, what will the drive have to do?

A

-Raise the pantographs manually on each motor car using the Local Panto EP button
-Send a TMM

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52
Q

If the CONTROL circuit breaker trips after using the Remote Panto Lower button, what will the drive have to do?

A

-Reset the CONTROL circuit breaker
-Electrically isolated the pantograph EP valve with the switch
-Press the remote pantograph lower button

This determines if the fault is with the EP valve

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53
Q

Can a train enter or remain in service if the pantographs cannot be lowered electrically from the leading motor?

A

No

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54
Q

If the CONTROL circuit breaker trips after using the Traction Equipment Reset button, what will the drive have to do?

A

-Identify the defective motor by using the THIS CAR fault light
-Isolate the traction equipment by placing the motor cut-out switch to ALL OUT
-Complete a TMM

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55
Q

If the CONTROL circuit breaker trips with the Master controller closed (haven’t touched anything) what is the probable cause?

A

A short circuit exists between the CONTROL circuit breaker and the master controller

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56
Q

With the master controller closed and the reverser in off, is there any current flowing from the master controller to the train cable, traction equipment, or rheo brake demand circuit?

A

No

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57
Q

If the CONTROL circuit breaker trips with the reverser in Forward, Neutral or Reverse, what are the probable causes?

A

-Short circuit on the electric brake demand wire in the train cable
-A fault in the rheostatic brake control equipment on any motor car

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58
Q

If the CONTROL circuit breaker trips, with the reverser in Forward, Neutral or Reverse, why could the fault be in either the train cable or rheostatic brake control equipment?

A

Because the rheostatic brake demand current is sent via the train cable to the rheostatic brake control equipment on every motor car

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59
Q

Can the CONTROL circuit breaker trip due to a short circuit on the rheostatic brake circuit when the train is stationary?

A

Yes, even though the rheostatic brake is not working while stationary, the circuits are energised ready on every motor car via the train cable

(If reverser in FWD, NEU, REV)

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60
Q

How is a fault in the Rheostatic brake rectified?

A
  1. Isolate the rheostatic brake by:
    -switching the local rheostatic brake isolating switch to ISOLATE
    -attempt to reset the CONTROL circuit breaker
  2. If it does not reset:
    -Return the local rheostatic brake isolate switch to the NORMAL position
    -Trip the EP circuit breaker to remove the electric brake demand from the whole train
61
Q

If the CONTROL circuit breaker trips immediately while powering (master controller is opened), where is the fault?
What can be done?

A

A short circuit somewhere in the train cable or the traction control equipment on any motor car in the train

Can try reset cb and proceed to power in a lower notch
Or put motors to ALL OUT in each motor car one by one until the cb stops tripping

62
Q

What does the train cable carry?

How is it carried between the two centre motors?

A

110v DC

Connection between the two centre motors is by spring loaded contacts in the Scharfenberg couplers

63
Q

What can cause the CONTROL circuit breaker to trip?

A

-Remote pantograph UP button
-Remote pantograph DOWN button
-Overload reset
-Master controller
-Rheostatic Brake

64
Q

What items are on the AUXILIARY circuit breaker?

Which are train lined?

A

Badscars

Bell
Aux start
Door control
Saloon lights
Couple/uncouple ❌
Aircon ❌
Rheo brakes
Self-centring ❌

65
Q

What happens when the Compressor Governor circuit breaker trips?

A

The compressor governor on that car would not be energised

The ability to remotely apply or release the train-lined spring park brakes from that car is also lost

66
Q

What does the motor alternator provide?
What does it convert?

A

Provides auxiliary power to the train
Converts 1500v DC into 415v AC and supplies the 110v DC supply

67
Q

How many motor alternators are needed to operate the train?

A

Need at least one running, the 110v DC will be enough to operate the train, but in a degraded mode

68
Q

What happens if one MA fails?

A

-Half saloon lighting will operate in each car
-Half of the air conditioners in each car will work
-Half of the cab lighting and heating will work
-The local Rheostatic brake where the MA has failed will not work (due to cooling fan not working)

69
Q

Should a MA ever be inspected outside of a siding if it is not working?

A

No, only in a siding environment as it is of lower importance to rectify.
One MA operating is sufficient for the whole train to operate

70
Q

Will all DC SUPPLY circuit breakers trip if there is a short circuit in the 110v DC train cable?

How many need to be reset?

A

Yes, they will all trip

If at least one can not be reset, the train is disabled
Only need one

71
Q

What do the contractors on the compressors do to make the compressors stop?
What does this maintain MR pressure at?

A

Contractors open to stop the compressors

Maintain main reservoir pressure between 585 and 725kpa

72
Q

How can the compressor governor be isolated pneumatically in the event of a defect?

A

The compressor governor isolating cock on the piping from the main reservoir

73
Q

If a compressor governor is electrically isolated, will it power the compressor contractor circuit?
Can that compressor still be started?

A

No, the isolated compressor governor will not power it

It can be powered by another compressor governor on another motor car

74
Q

What must be done if Brake Pipe pressure cannot be maintained above 425kpa?

A

The train must be declared disabled

75
Q

Are the compressors designed to operate continuously if required?

A

Yes

76
Q

What must a driver do, if time permits, if all the compressors are running continuously?

A

Attempt to locate the defective compressor governor by:

-Electrically cut out each compressor governor in turn until the compressors stop operating
-Reinstate if not faulty and move on to next one
-Once found, leave electrically isolated, submit a TMM

77
Q

What systems use main reservoir air on a Comeng?

A

-Door systems
-Air suspension system
-EP braking system
-Spring park brake system
-Pantograph
-Brake pipe charging
-Control Reservoir system (traction)
-Whistle
-Motor alternator contactors
-Compressor governor

78
Q

What must be done if there is a Main reservoir rupture/defect on the leading motor?
(Competent employee available)

A

-Turn the MR end cocks on both the Motor and adjoining trailer car
-Manually release spring park brakes
-Lower the local pantograph, and electrically isolate (toggle switch)
-Isolate local panto pneumatically
-Set motor cut out switch to ALL OUT
-Remove passengers from that car
-Isolate VICERS
-Isolate Door Loop Bypass
-Release train-lines spring park brakes
-Trip out compressor governor circuit breaker
-Instruct competent employee to open BVICS on a trailing motor and charge brake pipe to 550kPa
-Have them close the BVICS when brake pipe is fully charged

*Only brake available to the driver is emergency brake
*Can be drive at a maximum of 15km

79
Q

What must be done if there is a Main reservoir rupture/defect on the leading motor?
(NO competent employee)

A

Drive must declare the train disabled

80
Q

What must a drive do if there is a Main reservoir rupture under another motor car (not the leading)?

A

-Turn MR end cocks at both ends of the motor car
-Manually release SPB
-Lower local pantograph, isolate electrically and pneumatically
-Set motor cut out switch to ALL OUT
-Remove passengers from that car
-isolate yellow TECHAV on that car to prevent trip activating

In leading cab:
-Isolate door loop bypass
-Isolate VICERS
-Trip EP circuit breaker (operate on air brake)

Operate on deflated air bag speed restrictions (30 or half track)

81
Q

What must a drive do if there is a Main reservoir rupture under a Trailer car?

A

-Turn MR end cocks at botch ends of that car
-Remove passengers from that car
-Isolate VICERS
-Isolate Door loop bypass
-Trip EP circuit breaker

-Detrain passengers at next station
-30km max or half track speed

82
Q

What is the procedure if a Main Reservoir tank has ruptured?

A

-Close MR delivery cocks
-Place compressor contactor isolating switch to OFF
-Isolate Compressor Governor circuit breaker

83
Q

What will happen if the Automatic Drain Valve has broken off the Main Reservoir?

A

The pipe must be blanked, otherwise an automatic brake application will leak off on that motor and EP brake cylinder pressure will be reduced if the EP brake is used

84
Q

What is done if the MR flexible hose between cars bursts?

A

Close the MR end cocks in both sides of the affected hose

85
Q

How might a driver be alerted to a defective air suspension?

A

-Passenger complaints
-Rough riding of its the leading motor
-Observing the level indicators during prep

86
Q

What is the speed restriction when operating with a deflated or defective air suspension system?

A

Half track speed, to a maximum of 30km/h

Eg. 115=30
70=30
40=20
30=15

87
Q

Where does the control reservoir receive its air from?
What is its pressure?

A

The Main Reservoir
It’s pressure is 490kPa (reduced via a pressure reducer)

88
Q

What will happen if there is insufficient air pressure in the Control reservoir?

A

It will prevent the line breakers closing and that motor car will not power, however that other motor cars will still power

89
Q

Does any loss of Main reservoir pressure need to be fully investigated?
Why?

A

Yes, if it isn’t located and rectified, the train will be rendered disabled

90
Q

If the Rheostatic brake is feeling ineffective, what can be done?

A

It can be isolated along the whole train by operating on the Automatic air brake

91
Q

What are the reasons the EP brake may not functioning properly?

A

-Interruption of the electrical wiring within the train cable which serves the 7 step relays
-Defective brake unit on an individual car
-Defective brake controller or relay unit
-Mechanical breakdown of the brake rigging on an individual car

92
Q

If the Brake Pipe becomes inoperative on a leading or trailing car and NO competent employee is available to apply the park brake in an emergency, what can be done?

A

The train is considered disabled

93
Q

If you observe falling brake pipe and main reservoir pressure in the duplex gauge, what must be done?

A

-Place the brake controller handle into EMERGENCY
-Attempt to reset any activated trip on the train as per the trip reset procedure

*While the brake is in EMERGENCY, if the main reservoir recovers towards full pressure, it indicates there are no ruptures across the main reservoir system

94
Q

What does a driver need to do initially when brake pipe pressure is lost?

A

-Check if the train is derailed
-Ascertain whether the loss of Brake Pipe is potentially caused by a Trip activation at a signal or another cause

95
Q

If brake pipe pressure is lost and it is determined there is no signal involved what can the driver do?

A

-Place the brake controller into EMERGENCY and attempt to reset a potential trip activation
-Return the brake controller handle to run and release

96
Q

What must be done if a Rear Trip is activated?

A

-Place the brake controller into EMERGENCY until the brake pipe is depleted 0kPa

-Return the brake controller to Run and Release and observe the duplex gauge

-Confirm the activation of a trip on a trailing motor by observing BP and MR recovering

-The affecting trip must be located, raised or isolated

97
Q

If a rear motor has a defective trip, how is it isolated?

A

Isolate the Yellow TECHAV isolating cock
Stops the loss of BP pressure

98
Q

How is the VICERS system reset?

A

-Allow the train to become stationary
-Master Controller to ‘0’
-Place the Brake Controller handle to Emergency (BP below 25kPa)
-Wait for 10 seconds
-Press the VICERS Acknowledge button
-Return the Brake Controller handle to run and release to charge the Brake Pipe

99
Q

If any primary safety equipment is defective, what must be introduced?

A

The secondary safety circuit

100
Q

How is a train removed from the section if it has a defective Brake Pipe?

A

-The train must be driven and braked from the longest portion of continuous Brake Pipe
-A minimum of 50% continuous brake pipe is available to operate the train from

-A competent worker is required to either:
Apply the SPB on an un-braked lead or trailing car
Observe the track and signals (when in the lead car)

-Maximum speed of 15km
-Passengers detained at first possible location
-Train to be shunted to first available siding

101
Q

If the brake pipe is ruptured in cars 1,2 or 3 of a six-car train, and a competent worker is available, what must the driver do?

A

-Release the air brake on the defective car by using the hand release valve on the brake unit
-Trip the EP brake circuit breaker OFF on the motor of the train that will be driven from
-Instruct competent worker to ride in the leading motor and give instructions to the driver
-Drive the train from the most convenient motor
-Do not exceed 15km

102
Q

What must be done if the Brake pipe is ruptured on cars 4 or 5 of a six-car train?
(Not competent worker)

A

-Release the air brake on the defective car by using the hand release valve on the Brake Unit
-Isolate the Main Reservoir to 7-step relay (brake unit) on the defective car

-Open BVICS on the trailing motor car
-Place the Brake Controller handle on the trailing car to Run and Release

In the leading car:
-Open BVICS
-Operate train using EP brake
-Power and brake the train from the leading cab
-Do not exceed 15km

103
Q

How is a Brake Pipe leak between the Brake Pipe and the Triple valve isolated?
Will there still be Brake Pipe continuity throughout the train?

A

-Isolate the Brake Pipe to Triple Valve IC

Once isolated:
-Release the brakes on the defective car using the hand release valve
-Isolate the Main Reservoir to 7-step relay to prevent the EP brake from operating on that car
-Drive train according to bogies isolated procedure

There will still be continuous brake pipe throughout the train

104
Q

When is the Charging valve open?

A

At all times, except when the brake controller handle is in emergency
(it will be closed to stop the brake pipe charging)

105
Q

What is the first thing to check if the Brake Pipe does not charge when the BVICS is first opened?
(Brake handle in release)

A

Check the Main reservoir to Brake controller isolating cock is open

If it is closed, open it

If it is already open, close it and work the brake handle between Release and Emergency with the EP circuit breaker tripped

106
Q

If a charging valve is unable to be freed, what must be done?

(Open BVICS, BP won’t charge)

A

Have a competent worker in another cab charge the BP by opening their BVICS, then closing it once fully charged

-Driver in leading cab will only have emergency brake available
-Max speed is 15

-If no competent worker, train disabled

107
Q

What can an interruption of power to the lockout magnet valve be caused by?

A
  1. EP brake circuit breaker being tripped by:
    -The driver
    -A short circuit
  2. Loss of 1500v DC overhead supply
108
Q

What is the result of the lock-out magnet valve being defective in the CLOSED position?

A

No automatic air brake

109
Q

What is the result of the lock-out magnet valve being defective in the OPEN position?

A

Simultaneous Automatic Air Brake and EP/Rheo brake applications

110
Q

If the lockout magnet valve if stuck in the closed position, what must be done?

A

Operate the train on the EP and Rheo brake at a maximum of 15km
De-train passengers and continue to the first available siding to shunt the train

111
Q

What controls the operation of the Emergency Application Valve?

A

The hand and foot pilot valves

112
Q

What will turning the Red EC cock render inoperative?

A

-Trip valve
-Emergency Application Valve
-Control governor
-Hand pilot valve
-Anti-neutralisation device
-VICERS Activation valve

113
Q

What must a drive do to bypass the action of the control governor?
(Red EC turned)

A

-Set foot pilot valve
-Press the control governor bypass button
-Allow Brake Pile to recharge
-Submit TMM to TC

114
Q

How often must the Control governor bypass button be pressed when on the secondary circuit?
What happens if it times out?

A

Every 30 seconds
The secondary emergency application valve will cause and emergency brake application

115
Q

What does the release prevention valve do?

A

Prevents the automatic air brake from releasing when the brake controller handle is in any position other than release

Ensures the brake remains set when a service application has been made, even if the brake controller handle is moved partially towards release

116
Q

If a train is being operated with a defective release prevention valve, which brake is it advisable to drive on?

A

EP/Rheo

117
Q

What does the regulating valve control?

A

Controls the pressure output of the brake controller into the brake pipe in all positions of the automatic air brake valve handle, except for emergency

118
Q

What are the output pressure ranges of the regulating valve?

A

In RELEASE position: 550kPa

In FULL SERVICE position: 380-410kPa

119
Q

What does the output pressure of the Regulating valve range from?

A

RELEASE position: 550kPa

FULL SERVICE position: 380-410kPa

120
Q

How is a defective Regulating valve identified as opposed to a brake pipe leak?

A

Charge the brake pipe, then close the BVICS and observe the BP gauge

If the brake pipe air pressure falls rapidly, it indicates a leak

If the pressure does not fall:
-Make an emergency application of the brake
-Open the BVICS
-Release the brake

If the brake pipe only rises to its previously low level after the brake pipe has been charged, the fault is in the regulating valve

121
Q

If a defective regulating valve is causing the brake pipe to charge to a level between 425- 550kPa, can the train run?

A

Yes, subject to FMP restrictions

122
Q

If a regulating valve fault is causing the Brake pipe to only charge to below 425kpa with the handle in the release position, can the train run?

A

No, the pressure is regarded as being too low for safe operation of the Automatic air brake and the train cannot be moved under its own power

123
Q

If the brake handle moves involuntarily towards the release position what can be done?

A

Isolate the EP brake and drive using the Auto air brake

124
Q

How can sticking brakes be detected?

A

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

125
Q

What does the dump valve on the brake unit do?

A

Prevents sticky brakes

126
Q

How are sticking brakes rectified in running?

A

Trip the EP circuit breaker and make a full service air brake application and then release

127
Q

How are sticking brakes rectified while stationary?

A

-Perform a rapid succession of EP brake from release to step 7 and back to release
-Apply minimum power to move the train
-Shut off and feel for retardation
-If train rolls freely, continue in service and monitor

128
Q

What can skidding wheels be caused by?

A

-Heavy brake application, especially in wet or frosty weather
-Sticking brakes on a car
-Mechanical failure such as a seized traction motor or axle

129
Q

If brake block wear has entered the 25mm area, what action is required?

A

No action is required

130
Q

If brake block wear has entered the 10mm area, what action is required?

A

Must be reported as worn

131
Q

What action is required if the brake block is broken and the metal backing plate is coming into contact with the wheel?

A

The bogie must be isolated. Report to TC
The brake block is unserviceable

132
Q

What are the piston travel settings for the Westcode brake cylinder when in the applied position?

A

Between 30 and 65mm

133
Q

What are reasons for isolating bogies?

A

-Broken and incorrectly aligned brake rigging
-Missing and damaged brake blocks
-Turned brake heads
-Sticking brakes
-Incorrect piston travels affecting the brake application
-Broken or leaking brake pipe or equipment

134
Q

What are the different types of Comeng saloon door defects?

A

-Mechanical
-Pneumatic
-Electrical

135
Q

What are the potential causes of a flashing door closed light?

A

-Saloon door/s failing to close
-Isolated PLC in any trailing car
-Open circuit in the train cable
-A marker light switch in the last motor car being in the wrong position
-A coupler sensor being defective
-Auxiliary circuit breaker in the last motor car being tripped
-A control circuit breaker tripped in the last motor car
-BVICS open in the last motor car

136
Q

What allows traction power to be obtained with a flashing door closed light?

A

Door loop bypass key switch

137
Q

If one door is defective, what is most likely cause?

A

A mechanical defect

138
Q

If one whole side of doors on a car is defective, what is the most likely defect?

A

Electrical or pneumatic

139
Q

If all doors on a car are defective, what is the likely cause?

A

Pneumatic or electric

140
Q

What is the likely cause if all doors on a train are defective?

A

Auxiliary Control circuit breaker

141
Q

If saloon lights are inoperative throughout the whole train, what must the driver do?

A

-Observe at least one pantograph is raised
-Check the 110v DC supply light is illuminated
-Trip and reset the Auxiliary MCB
-Press the saloon light on button 3 times, then press and hold for 5 sec

If they fail to illuminate:
-Try another motor car, press for 5 seconds

142
Q

How will the lighting be extinguished if a lighting circuit breaker has tripped?

A

Extinguished in a regular sequence

143
Q

What is the cause if lights are extinguished with no discernible pattern?

A

Inoperative tube

144
Q

If all saloon lights are defective in one or more cars, and emergency lights are inoperable, when/where must the train not operate in service?

A

-During the hours of darkness
-Through the MURL

145
Q

How long can the emergency lighting operate for?

A

Up to two hours

146
Q

If a Comeng is assisting another Comeng, and is connected electrically, can the 110v DC Bell system be used to communicate?

A

Yes

147
Q

If a Comeng is assisting a Comeng, what must the driver of the assisting train do?

A

-Remain in the attached cab
-Ensure the train-lined park brakes are applied
-Isolate the VICERS key switch
-Isolate the Door Loop Bypass switch
-Raise the trip
-Apply and isolate the Auto Air Brake
-Turn Red EC cock
-Set the Foot Pilot Valve
-Press the Control Governor Bypass button as required

148
Q

If a Comeng is assisting a Comeng, what must the driver of the disabled train do?

A

-Open BVICS
-Lower the Trip
-Place brake controller handle to EMERGENCY
-Isolate the EP brake circuit breaker

149
Q

Can trains of different types be coupled together electrically?

A

NO

Comeng Faults (1 decks)

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