Comeng faults Flashcards
What is the effect of a Lock-out Magnet Valve being defective in the closed or energised position?
The Automatic Air Brake will only operate in Emergency
What’s does TECHAV (Primary Safety Apparatus) stand for?
• Trip
• Emergency Application Valve
• Control Governor
• Hand Pilot Valve
• Foot Pilot Valve
• Anti Neutralisation Device
• VICERS
Under what conditions should the No 1 position of the Master Controller be used mostly?
Shunting
For what period must a driver press and hold the “Park Brake OFF” button?
5 sec
On a Comeng Train, the Local Park Brake Controls are located in which area?
Van area
If a Compressor Governor Isolating Cock has been turned to isolate, what is the effect on the train?
Compressor will run continuously
Rheostatic braking deficiencies can only be diagnosed when the train is moving above what speed?
Moving above 5 km/h
If a Control Reservoir develops a rapid air leak, why must it be isolated?
• To prevent Main Reservoir pressure from falling
• To prevent the continuous running of Air Compressors
Following reaching a terminal location, after running on the Emergency Circuit, what must a Driver do before changing ends?
• The EC cock must be turned to its
Normal position
• The TECHAV cock must be turned across the pipe
• A Fault Warning Notice must be placed in the cab
What effect would a compressor governor with contacts permanently closed have on the air compressors?
They will run continuously
When power has been restored to
a section after a loss, Metrol may instruct drivers to raise pantographs. At what intervals will Metrol ask each driver in turn to raise pantographs?
30 minutes
If both headlights are non-operational during daylight hours, what Is the speed restricted to in the MURL and West Richmond tunnels?
50 km/h
True or False?
Isolation of the Rheostatic brake to determine a cause of a braking fault can only be done on a car by car basis.
True
By what method can the Rheostatic point brake be isolated on the entire train?
Because Rheostatic Brake Circuit breakers aren’t train-lined you need to trip EP circuit breaker .
If there is a fault in the train cable
between the first and second cars which affects the A, B and C wires from the brake controller, what will the effect be on the train?
The EP brake will not operate beyond the point of the fault
(from the second car onwards).
If the EP brake operates in Step one and two, but fails to operate in step three remaining at 70kPa in the brake cylinders, what would likely be the cause?
• A defective Lockout Magnet Valve stuck in the closed position, preventing further pressure increase.
• A failure of the B wire from the Brake Controller, which controls brake cylinder pressure beyond Step 2
If the EP or rheostatic brake is erratic in it’s performance, what 3 things must be done?
• EP circuit breaker must be tripped
• Train must be run on the Automatic Air
Brake
• TMM must be submitted
If a second BVICS is open on a train, how will this situation present itself in the leading cab?
The Flashing Blue Door Light will flash continuously
If brakes are sticking on a trailing carriage, what indication will the driver receive in the driving cab?
Wheelsleep light may or may not illuminate.
True or False?
Main Reservoir pressure will not be monitored whilst the EP Circuit breaker is tripped and Low Pressure Flag is raised.
True
When a train is running with deflated air suspension, the maximum speed is what?
50% of track speed to a maximum of 30
km/h
True or False?
Should the brake controller handle move towards a more applied position the result would be a stronger application of the brakes and therefore not detrimental to safety.
True
If a brake controller handle is moving to a more released position without
Driver input, what should be done?
• Cut out the EP circuit breaker and run on Air brake.
• Submit a TMM.
What does a steady Air Con Fault light indicate?
No more than one HVAC has failed on at least one motor or trailer car
What does a flashing Air Con fault
light indicate?
Both HVAC units have failed on one or more trailing motor or trailer car
If a driver observes a flashing Air
Con fault light, but all HVAC units appear to be operating what else can a driver check?
Air Con Alarm Circuit breaker above No.
3 door in all cars
A wheel slip fault light illuminated whilst the train is in motion, indicates what?
A difference in speed of approximately 15 km/h between axles
A WHEELSLIP fault light illuminated whilst the train has stopped indicates what to a Driver?
That there is a fault in the wheel slip unit and its associated equipment.
The control circuit on Comeng
trains supplies current for the operation of what 6 things?
• Master Controller
• Reverser
• Traction Equipment Reset
• Remote Panto Raise
• Remote Panto Lower
• Electric Demand Circuit Breaker
If a train is failing to power and still
NOT powering after testing a second master controller, what is the next step in the fault finding procedure?
Declare train disabled
What is the correct procedure if Marker Lights and Headlights fail during darkness and it is NOT possible to reverse units to eliminate the fault?
The train must be removed from service at the first opportunity
What is the correct procedure if Marker Lights and Headlights fail during darkness and it is NOT possible to reverse units to eliminate the fault?
The train must be removed from service at the first opportunity
If normal Brake Pipe air pressure cannot be maintained, how could a driver ascertain the cause of the fault?
By closing the Brake Valve Isolating
Cock. If brake pipe air pressure remains steady the regulating valve is defective, if it falls rapidly, the brake pipe is leaking.
How many turns are required to
manually apply the Spring Park Brake fully on a Comeng tread brake train, after it has been manually released?
40 - 60
What must the Driver of a Comeng train do, if the brake pipe hose bursts between the centre motors and NO
competent employee is available?
Close the brake Pipe cocks between the centre motors, open the BVICS of the rear portion and run on EP brake. Isolate VICERS in the trailing centre motor.
If a train has failed and the trip, switches, gauges and cocks are all OK.
What must the Driver check next?
That DC and AC power are available
How many anti-clockwise turns are
required to manually release the spring park brake on a Comeng Disc Brake train?
1
If the compressors run continuously, after the Compressor Governor Circuit Breaker has been isolated, what is the Driver’s next action?
Restore the Circuit breaker to the normal position, then isolate the compressor governor circuit breaker on the next motor.
If there was a fault, somewhere on
the Rheostatic Demand Circuit of a Comeng train, which circuit breaker would trip?
Control Circuit Breaker
Consider the following scenario on a Comeng Train:
a) The Master Controller is in the closed position
b) The Reverser is in Forward, Neutral or Reverse
c) The Brake Controller is in the applied position
d) The EP Circuit Breaker in set
If the Control Circuit Breaker will not remain set, where is the probable cause of the fault? 3
• Rheostatic Brake demand wire of the Train Cable
Local Rheostatic brake controller equipment on any M Car
• Between the Control Circuit Breaker and the Master Controller
If the Automatic Air Brake becomes
inoperative on a leading motor, and no competent employee is available, what must be done?
Declare the Train Disabled
If an EP brake becomes defective, by what means would a driver isolate it?
Tripping the EP Circuit Breaker
True or False?
The rheostatic brake system will operate normally, when the EP brake is isolated.
False
At 80km/h, and in Step 7 of Rheostatic Braking, what amperage should a Driver observe on the Ammeter?
200 Amps
At 80km/h, with the Brake Controller in Step 7, at what amperage would a Driver book a “low amps rheostatic braking” fault and what would a driver do following the booking?
• 160 Amps or less
• Isolate Rheostaic Brake on the lead motor car
With maximum EP brake pressure at Step 7 of EP braking, what extra braking force is provided if the handle is moved to Emergency?
10%
What valve provides for extra braking force when moving from Step 7 of EP braking to Emergency?
Restricted Application Limiting Valve &
Ball and Check Valve
When a Comeng is being assisted by a locomotive hauled train, what must be used on the Comeng Train?
Transition Coupler
When being assisted by a locomotive hauled train, can a driver or drivers attach the transition coupler?
No
What does a raised “Low Pressure” Flag indicate to a Driver?
• Pressure in the main reservoir is below a safe level (500 kPa)
• The EP brake is inoperative due to a failure or isolation of the power supply
True or False?
The LP flag will be vertical if the EP main reservoir isolating cock has been isolated.
True
If an EP fault occurs, does the “Low Pressure” flag continue to monitor Main Reservoir pressure?
No
The Pantograph Isolating Switch in the Drivers’ cab of a Comeng EMU, performs what function?
Electrically isolates the pantograph EP valve on that motor car, preventing it from being raised.
If the local Pantograph Isolate switch is in the Isolate position in the rear car, and a Driver attempts to raise all pantographs remotely from the leading car, what will happen to the pantograph in the rear car?
It will not raise as the EP valve in the drivers’ cab is isolated
All pantographs are raised on your train. If there is a loss of overhead power what is the first thing Metrol will instruct all Drivers in the affected area to do?
Lower the Local Pantograph from the cab the train is being driven from
If the 1500 volt overhead supply is weak, Metrol may instruct all Drivers in the affected section to leave how many Motor Alternators operating?
1
What is the effect of switching the Comeng Pantograph Isolate switch to
ISOLATE?
It would electrically isolate the Local
Pantograph EP valve on the local motor only
When the Rheostatic Brake Isolating switch in the Drivers’ cab has been placed to isolate, what will be the effect on the train?
Isolates the rheostatic brake on that motor car only
The Auxiliary Isolating switch in the Drivers’ cab performs what function?
Isolates the Auxiliary EP Valve on that motor car only
If the Auxiliary Isolating Switch in the trailing drivers cab was in the Isolate position, and a Driver pressed the Aux Start button, in the leading cab, what would occur?
The MA on the trailing car would not start as the MA Start EP Valve has been
electrically isolated
The LSM on a Comeng EMU performs what 4 functions when a train is running?
• Detect a reduction of DC Voltage
• Stop remote Motor Alternators
• Lower Remote Pantographs if the train is travelling less than 8 km/h
• Trips an EP circuit breaker changing to automatic air brake if there is a total loss
of power.
What function does the Horn Isolate Cock serve?
Isolates the flow of main reservoir air to
the train horn on that motor car only.
What function does the Uncouple
Isolate Cock serve?
Isolates the flow of main reservoir air to the Pneumatic Uncouple buttons
What function does the Panto EP Isolating cock serve?
• Isolates the flow of main reservoir air to the local Pantograph EP raise valve
• Allows air within Pantograph line to pass to atmosphere causing Pantograph on that motor carriage to lower
What function does the Trip Gear Isolating cock serve?
• Isolates the flow of control reservoir air to the trip latching lever rendering it ineffective
• When isolated, the trip will lower irrespective of the position of the trip latching lever
What function does the Brake Pipe Sensor Isolating cock serve?
• Isolates the flow of brake pipe air to the Schartenberg uncoupling governor allowing the coupler to uncouple regardless of the brake pipe pressure
What function does the Panto & MA Isolating cock serve?
• Isolates the flow of Main Reservoir air to the local Panto Raise EP Valve
• Isolates the flow of Main Reservoir air to the local Motor Alternator Start EP Valve
What function does the Low Pressure Flag Isolating cock serve?
• Isolates the flow of main reservoir air to the stop flag
• The low pressure flag will rise due to spring tension and the monitoring function of the stop flag will be lost
For a Comeng train to run, how many DC Supply circuit breakers need to be cut-in?
1
For a Comeng train to run, how many DC Supply circuit breakers need to be cut-in?
1
If all of the DC Supply circuit breakers on a Comeng EMU were to trip, what would the result be to the operation of the train?
The train will fail
If a Control Circuit Breaker trips in the leading car, what will the result be to the operation of the train?
The train will fail
If a Control Circuit Breaker trips in the trailing motor, what will the result be to the operation of the train?
The train will have a constantly flashing blue doors closed light
Which 8 electrical items on a Comeng EMU are affected if the Auxiliary Control
Circuit Breaker is tripped?
• Doors Control
• Bell
• Saloon Lights Control
• Auxiliary Start
• Couple and Uncouple functions
• Air Con #1 Control
• Local Rheo Brake
• Scharfernberg Self Centring device
If the Auxiliary Control Circuit Breaker is tripped, whilst the doors are in the open or released position, what will the effect be on the train?
Train will fail
If the Compressor Governor Circuit breaks trips in the leading car, what is the effect?
• The compressor governor on that motor car will no longer monitor main reservoir pressure
• The Park Brake ON and OFF buttons are on this circuit and will not operate in this cab
What purpose does the Compressor Governor circuit breaker serve on a Comeng train?
• To electrically isolate the local
compressor governor
True or False?
The Compressor Sync Circuit Breaker is train-lined.
True
What will the effect be on the train if point a Compressor Sync Circuit Breaker trips?
• The local compressor will be operated by the local compressor governor only
• Remaining compressors will not be affected by that governor
If the Cab Lights and Battery Charger circuit breaker is tripped, what would the effect be on the train?
• 240VAC cab lights will fail to operate
• 240VAC van area lights will fail to operate
• 240VAC Battery Charger circuit will fail
What does the GPO and Cab heaters Circuit Breaker protect?
• Drivers footwell heater
• Van area Heater
• 240VAC General Pupose Outlet will fail
If the PA and Radio Circuit breaker is tripped, and an announcement is made from another motor car, what will the result be to the train?
• The announcement will not be heard in the car with the tripped circuit breaker
What would the effect be to the train, if the DTRS Radio Circuit breaker were to trip?
• The DTRS in that car would operate on battery backup
Which of the following Isolating cocks are located above the trip apparatus?
• EC Cock
• TECHAV Cock
• Main Reservoir to brake controller
Isolating cock
What function is the EC Cock used to perform?
• Used to isolate the safety apparatus on a leading motor should it become defective
• Introduces a Secondary Control circuit
• Allows the train to be driven, should a component of the primary safety apparatus fail
What function does the Main Reservoir to Brake Controller Isolating Cock
Serve?
• Should the brake controller develop a fault, it allows the isolation of the brake controller from the rest of the Main Reservoir system.
To test the PEl’s throughout the train, what button would a Driver press on the DDU?
Status Mode
To set a special message
throughout the train, what button would a Driver press on the DDU?
Special Function
At what speed does CCTV viewing cease to function through the DDU?
8 km/h
If power has been lost or the BVICS has been closed for less than three minutes, what must a driver do to ensure the PIDS are operational and set correctly?
Nothing
If an error is encountered after attempting to set a TDN into the DDU, what must a driver do on the journey?
Make announcements
Which of the following equipment forms the primary safety apparatus?
• Trip
• Emergency Application Valve
• Control Governor
• Hand Pilot Valve
• Foot Pilot Valve
• Anti Neutralisation Device
• VICERS
What is used to Isolate the Primary
Safety apparatus and allows the train to be operated on the Secondary Safety
Apparatus?
• EC Cock
What 4 things must be done to enable a Driver to operate a train on the Secondary Safety Apparatus?
• Secure the train
• Turn the RED EC cock across the Pipe
• Depress the foot Pilot Valve to the mid position
• Press the Control Governor By-Pass
Button
After setting the Emergency Circuit, after what time will the Control Governor ByPass button begin to flash?
• 30 Seconds
After setting the Emergency Circuit, and seeing the Control Governor By-Pass button begin to flash, how long does a driver have to press the button prior to a penalty brake application being applied?
• 10 Seconds
What is the TECHAV cock utilised for and what is the result of it’s use?
• Used to isolate the safety apparatus on a non-driving motor car
• The train cannot be driven from that motor car
What would cause a Flashing Doors Closed Light?
• Door System Faults
• Control Circuit Breaker Tripped in rear cab
• Rear tail lights in OFF position
• PLC Circuit Breaker Tripped in any
Trailing Car
• coupler sensing it is still coupled after uncoupling
• Auxiliary Circuit Breaker tripped in another cab
• open circuit in the Train Cable
• A second BVICS open
If a Driver experiences a Flashing Door Closed Light situation, that cannot be rectified. What must the Driver do?
Activate the Door Loop By-Pass Key
Switch
True or False?
When the Door Systems have been bypassed or isolated, all passengers must be removed from the train and that train will be taken out of service.
True
True or False?
When the Door Systems have been bypassed or isolated, all passengers must be removed from the train and that train will be taken out of service.
True
True or False?
The driver must use the microphone fitted to the DDU to answer PEl calls.
The DTRS microphone is not connected to the PEl.
True
The PLC Circuit breaker is located above which door in each car?
3
Which of the following items are connected to the PLC?
• Drivers Door Indicator Lights
• Door Closing Delay Relay
• Door Chimes
• Secondary Release Feature
• Foot Pilot Valve
If headlights remain in the ON position after the Reverser has been set to OFF, what can a Driver do to ensure the headlights are not left on after changing ends?
Place the Headlights Circuits Breakers to the OFF position and submit a TMM
If headlights do not operate automatically when the Reverser is placed to FWD, what can a Driver do?
• Turn the Headlights on manually using the panel switch and submit a TMM
What piece of equipment on a Comeng train allows graduated power to be applied to the traction motors allowing slower acceleration?
Resistor Grids
If a rupture occurs between the Spring Park brake isolating cock and the Spring Park brake cylinder, what actions if any would a driver take to rectify the fault?
• Close the Spring Park Brake Isolating
Cock
• Manually release the Spring Park Brake on that bogie
If the Control Reservoir is ruptured, which isolating cock must be placed to the isolate position?
• Control Reservoir In Isolating Cock
Main Res Operating range?
585 - 725
What are the six things fault Warning notice books are used for?
- bogeys isolate
- airbag deflated
- Lateral sway fault
- Red EC
- Yellow TECH
- Doors isolated
Whistle Failure speeds in service
Cautiously at reduced speed
15km/h through yards, stations or near employees/persons working on or near the line
What are the components of the brake controller?
CLERR
Charging Valve
Lock out magnet valve
Emergency Exhaust
Relay valve
Release prevention
Regulating Valve
What does the Charging Valve do?
Charges the brake pipe
What does the Lock out magnet valve do when energised?
Prevents simultaneous application of auto air brake and EP brake
What does the Emergency Exhaust valve do?
Closes charging valve for emergency brake.
What is the Brake unit made up of?
Seems Very Hard Remembering What Brakes Really Do Right now
Seven step Relay
Variable Load
Hand Release
Restricted Application Limiting Ball check
WERP triple
By pass check
Release ensuring
Dump valve
What does restricted application limiting valve and ball check valve do?
Allows a 10% increase in brake cylinder pressure when using air brake.
What does restricted application magnet valve do?
Prevents the simultaneous application of the EP brake while Reostatic braking
What does release ensuring valve do?
Removes 14 KPA from auxiliary res when in run & release
What does LSM stand for?
Loss of overhead shutdown module
