Comeng faults Flashcards
Train fails to power procedure
- Trip
- Switches - BVICS, door closed light, control, aux control and DC supply circuit breaker, motor isolation switch
- Gauges - main, control res and brake pipe
- Cocks - BVICS, red EC/TECHAV
- DC supply - supply light, LP flag lowered, bell works + AC supply saloon lights on
- Reverser
- Overload (traction equipment reset) while in direction
- Brake pipe reduction (hand pilot/cg test)
- Bypass C.G.
- Door loop bypass
- Second master controller
If still carked, train is disabled
Main res getting to 775 and safety valve blowing off
- Trip out lead compressor governor and monitor main res
- When changing ends, try tripping it in centre cabs to see if it stops rising to 775
- If get back to other end and the problem is fixed with the new lead compressor governor, just leave it instated and let compressors run continuously (otherwise train lined park brakes won’t release)
Main res rupture
Turn both MR end cocks on the two cars
Manually release spring park brake
Isolate local panto, VICERS, motors to all out
Kick passengers out of the problem car since doors will have no air to keep doors closed
Trip out EP and run on air brake
Release train lined park brakes
Trip compressor governor out
If lead motor is where ruptured main res is,
Close BVICS in lead motor, and competent employee open it in another motor
Since emergency brake only available in lead, max 15km/h
If in any other motor or trailer,
. ½ track speed to a maximum of 30km/h
When your train has failed to power and you have ensured your trip, switches, gauges and cocks are all okay, what is the next thing you need to check for?
DC Supply - bell and LP flag
AC supply - headlights and saloon light
If the DC supply light was extinguished what are some other ways to indicate that DC power is available
Bell
Low pressure flag lowered
What is the purpose of doing the brake pipe reduction during a ROBBDS test
Test if the control governor opens and closes, no dirt between contactors
What cock needs to be turned to introduce the secondary safety circuit
Red EC cock
What does a local fault light indicate to the driver
Indicates overload of an electrical nature
The control reservoir holds what amount of compressed air
490kpa
If there was a rupture in the control reservoir, what would be the effect on the motor carriage
No traction or rheo
If you had a control reservoir rupture, what fault light indicator should you have whilst powering
Line SW
If the traction motors on the lead driving motor weren’t operating, how would you isolate this
Motor iso cock and rheo switch
( 1&2 or 3&4 or all out)
If you needed to isolate just one pair of traction motors, what key is required to operate the traction motor cut out switch
Controller key
If an overload had tripped on the train, causing your motors to drop out, which button would you press to rest them
Traction overload reset
On a prep you found the main switch isolated, would they be able to reinstate this
No, contact fleet
What equipment runs off 1500vDC
(5 answers)
Pantos, MA’s, air compressors, traction equipment and associated circuits
What equipment runs on 415vac
Air con
What equipment runs on 240v AC
Saloon lights and headlights
What equipment runs on 110v AC
Control trip circuit
What power does the traction equipment run off
1500 v DC
After a loss of overhead, how many times does the overhead system attempt to reset itself
2 times
If the overhead power is lost , what will happen to the doors on the train
No doors
If overhead power has been unable to be restored, metrol will contact all drivers in the affected area and advise them to do what
Check mirrors to confirm that the LSM has lowered all trailing pantos
Press local MA EP stop valve
Press local panto EP stop valve
Once overhead has been restored, at what minute intervals will metrol instruct drivers to move
1 min intervals
What notch of power will a driver need to operate in once overhead has been restored
Series
Can a driver ever assume there has been a loss of overhead?
No,
Driver to inspect trip, switches, gauges and cocks
What item would a driver need to check to ensure AC power was available
(3 answers)
Normal saloon lighting
Van area cab light
Headlights
If overhead has been restored and there is no communication at what intervals can UP trains proceed
30 sec
If overhead has been restored and there is no communication at what intervals can DOWN trains proceed
60 sec
After a loss of overhead, how long will the emergency lights stay on for
2h
What indication would you get on your fault panel that the emergency lights needs to be reset?
The battery charger light will flash on the fault panel
What is the purpose of the LSM
Protect the overhead system from defective 1500 v DC train equipment from high demand after overhead start up
What is the speed threshold connected to the LSM
8 km
What voltage does the DC output need to drop below for 2 continuous seconds for the LSM to activate
95v
If the LSM has activated what brake will be available on the train
Over 8km
Air brakes
If the train is stationary in the yard and the LSM has activated as it has detected a loss of overhead. What equipment will be available on the train
No equipment will be operational on the train
If the train Is moving at approximately 90 kmh and the LSM has activated what would be the effect on the pantos
Pantos remains raised
If the train is stationary and the LSM has activated what will happen to the trains MA contactors if
1. BVICS open
2. BVICS closed
- Lead MA contactor ON, all others off (since trailing pantos will drop)
- All MA contactors OFF, all pantos down
When the power has been restored after a loss of overhead and Electrol have advised that, it’s due to a defective train. Metrol will contract drivers one by one and advise them to do what first
Request each driver to raise all Pantos and start MAs, when overhead is lost the defective train has been ID
When there has been a loss of overhead, after how many minutes with the VICERS activation valve activate
5mins
Without power VAV will open and exhaust BP
Will the traction overload reset button work to reset an MA that has oversped
No
How do you locally isolate a defective rheo brake
Rheo brake toggle switch
What does a steady aircon light indicate to the driver
One air con has failed on one or more carriages
What does a flashing aircon light indicate to the driver
Both air cons have failed on one or more carriages
What does a steady wheelslip light indicate to the driver if the train is stationary
Faulty wheel slip unit
What is the axel speed variation that will cause a wheelslip light to come on when the train is in motion
15km
What equipment is connected to the control C/B (5 answers)
Master controller & reverser
Traction equipment reset button
Remote panto lower and raise button
Rheo brake demand circuit
Train cable
If the control C/B tripped in the lead driving cab, what would be the effect on the train
Master controller inoperative and no train lined signals can be sent to the traction equipment
Speedometer will lose power
If the control C/B tripped when the remote panto raise button was pressed, what action would the driver need to do to raise their Pantos
Reset C/B
raise each panto locally
Submit TMM - faulty panto raise button
If the control C/B trips when the remote panto lower button is pressed and you are unable to locate the defective panto, can the train enter service
No
If the control C/b trips when the remote panto lower button is pressed, what must be done when the defective panto has been located
Reset the control circuit breaker
Electrically isolated EP valve with the switch
Press the remote panto lower button
If the control circuit breaker trip with the master controller closed (0 position), the reverser in OFF, the panto raise or lower button or traction equipment reset button Not being pressed and the brake controller handle is in the release position, where is the fault between
Short circuit between circuit breaker and master controller
What would be the effect if the control C/b tripped on the trailing motor
Flashing door close light
After 2 h of emergency lights being on how do you reset the lights
Turn Market switch
How do you isolate the rheo train lined
EP circuit breaker and run on air
You have taken a train from flinders street and upon arrival at Richmond you have noticed That all the compressors on the train are operating continuously, as time does not permit for Full fault finding procedures, what would you do to attempt to rectify this fault?
Isolate compressor governor electrically in the leading motor car
What is the minimum amount of the traction motors required to keep a train in service
50%
Is the 110vdc trainlined
Yes
What equipment is connected to The auxiliary control C/b (7 answers)
Bell
Aux Start
Doors controls
Saloon lighting
Couple - Uncouple
Number 1 air con
Self centring
How many MAs do you need operational to have full saloon lighting on a 6 car
All
How many MAs do you need operational to supply the train with 110vDc power
1
What power does the MA convert the 1500v DC down into
415vac
What would be the effect if 1 MA failed on a 3 car consist (5 answers)
Half saloon lights
Half air cons
Half headlights
Lose console light
Lose rheo brake
If all 4 DC circuit breakers trip and you are unable to reset any of them, what would be the effect on the train
Train disabled
What is the main reservoir operating range
585-725kpa
If you were unable to rectify compressors operating continuously on the train whilst in Running, what would be the effect on the train?
Safety valves would be blowing
What would be the effect on the compressors train lined if one compressor governor had it’s contacts permanently close
All compressors will run continuously,
Until the safety valve will blow at 775kpa
What equipment is connected to the Main reservoir system? (10)
• Door system
• Pantograph
• Motor alternator contractors
• Air suspension system
• Brake pipe charging
• Compressor Governor
• EP braking system
• Control res system
• SPB
• Whistle
If you had a main reservoir pipe rupture on a leading motor what brake would be available To use?
Emergency brake
The compressor governor c/b also powers what other button
The train-lined spring park brake buttons
The compressor governor c/b also powers what other button
The spring park brake button
What would be the effect on the train if you pneumatically isolate a compressor governor via the isolating cock
Governor contacts close and compressors will run continuously
If you had a main reservoir tank rupture what cock would you need to isolate
Main res delivery cocks
Compressor governor c/b in cab
Turn off compressor contactor switch in cab also
If you had a main res tank rupture why would you need to isolate the compressor governor on that motor car
To stop the compressor from continuously running
If you had a deflated air suspension and were driving in a 50km area, what is the max speed you can travel at
25km
What is the rule regarding speed with defective or deflated air suspension
Half- track speed to a max of 30km/h
If you had a rupture in your control reservoir, why would it need to be isolated
All switches will remain open and there will be no traction power
What equipment would need to be isolated if you had a control reservoir rupture
Iso control res IN cock
Motors to ALL OUT
Stops fault lights
TMM
If you had a whistle operating continuously, what would be the first thing you would do to rectify the fault
Up and down on the lever several times
If no good, isolate cock in the driver’s foot well
What speed restrictions apply when you have an inoperative whistle
Cautiously at reduced speed
15km max - stations, yards, around persons working near line
Can a train remain in service with a low sounding whistle tone
Yes
What is the first thing a driver should check when they notice a loss of brake pipe pressure
Check if the train has derailed
What would be the cause of the brake pipe depletion if after placing the brake controller to the run and release position it recharges
Trip activated
If there is a brake pipe rupture on car 1,2, or 3 can the train be driven from the lead motors
Drive from 4
CE in lead
Driver on air
If the brake pipe has been ruptured on car nr 3, where must the competent employee sit
Lead motor
What brake will be available in the lead if the brake pipe rupture is located under car Number 1?
Spring park brake
If the brake pipe rupture is underneath car number 4, is a competent employee required to run the train in the original direction of travel?
No because we can use EP brakes to drive
What brake is the driver required to use from the lead motor if the brake pipe rupt car number 5?
EP if no competent worker
Air if competent worker available
What additional cock may be turned if there has been a rupture in the brake pipe Underneath cars 4 and 5?
Van Area cock if required (by competent employee in trailing motor)
At what speed must a six car train be driven after a leak in the brake pipe between the brake pipe to brake Unit isolating cock and the triple valve of one carriage has been stopped?
15km/h
what position is the brake controller handle if the charging valve closed ?
Emergency
What is the max permissible speed required to run the train when it has a defect affecting continuity of the brake pipe
15km
If the brake pipe fails to charge with the brake controller handle in run and release and the BVIC is open, which cock should the driver ensure is in the open position
Main res to brake handle
If the driver is unable to rectify a charging valve defect, can the train be run without a competent employee
No
If the charging valve defect where the driver can’t charge the brake pipe from the leading cab and a competent employee is available to charge the brake pipe from a different cab. What is the max speed the train can run at
15km
What is the effect of a lockout magnet valve becomes defective in the close or energised position
Air brake will not engage in the event of overhead loss, so must drive to next station at 15km/h using EP/rheo then detrain and shunt.
ie. if overhead is lost, there will be no brakes except emergency
What is the effect of a lock out magnet valve being defective in the open position
EP / rheo and air brake will all apply at the same time ( superbrake)
Fix: trip EP drive air only
What controls the operation of the emergency application valve
Hand and foot pilot
What are some potential causes of a FDCL? (6 answers)
• An open circuit in the train cable
• A marker light switch in the last motor cab being in the wrong position
• A coupler sensor being defective
• An Auxiliary circuit breaker in the last motor cab has tripped
• A Control circuit breaker has tripped in the last motor car.
• BVICS open in the last motor car
If the emergency application valve is defective what can you do
Run on secondary safety apparatus
If a flashing door close light cannot be rectified, what must be isolated for the train to regain traction power?
Door Loop Bypass
How often does the control governor bypass button need to be pressed
30 sec
If only one door on the train is defective, what would be the most likely cause?
Mechanical or obstruction
What is the purpose of the release prevention valve
Prevents air brakes from releasing
If all doors on one carriage become defective, what would be the most likely cause?
Door cocks could be isolated
Electrical circuit breakers above door number 3
If all doors on the entire train become defective, which circuit breaker should be checked?
Auxiliary circuit breaker
If the release prevention valve is defective, which brake should the train be run on
EP/ rheo
How many MA’s need to be operational on a 6 car train to have FULL saloon lighting?
All 4
Where is the saloon lighting circuit breaker located within the carriage?
Door 3
What would be the likely cause if the saloon lighting was defective in a regular sequence?
A lighting circuit breaker has tripped or a switch it turned to the off position
How would a driver ascertain if the brake pipe isn’t charging correctly due to a regulating valve defect or a brake pipe leak
Charge BP, close BViC, if BP drops rapidly a BP leak is present.
If BP remains steady. Apply EMY brake, open BViC and charge BP. If BP charges to the same pressure as previous, regulating valve is defective
If the brake pipe charges to between 425-550 kpa, can the train stay in service
Yes as normal
What would be the likely cause of the saloon lighting was defective in a IRREGULAR sequence?
Inoperative tube
If the brake pipe cannot charge above 425kpa due to regulating valve defect, can the train be operated without a competent employee
No will be disabled
If the brake controller handle moved involuntarily to a lease position, what would be the safest way to operate the train
Trip EP c/b and use the air brake
If the saloon lighting is inoperative throughout the entire train, and no emergency lighting is available, can the train remain in service?
Not During hours of darkness or in the MURL
How long does the emergency lighting last for in the Comeng train before needing to be reset?
2 hours
What component of the brake unit is used to assist to prevent sticking brakes
Release ensuring valve
Dump valve
What indication would a driver have If sticking brakes (4 answers)
Retardation of the train
Smoke and odour
Observation of the brake cylinder gauge
Illuminated wheel slip fault light
What are some methods of communication that can be used during training rescue?
Bell codes
Whistle codes
DTRS
Any other safe form of communication
If the train had an electrical fault, can the disabled and rescuing train be coupled up electrically?
No
What must be done when 2 trains have been coupled up to perform a train rescue?
Continuity
What is the first step a driver must do when encountering sticking brakes during running
Have to feel the train. Lack of power, not rolling freely or wheel slip light
If a comeng train is pushing a disabled train out of the section, how must the cab of the assisting train be set up?
The driver of the assisting train will:
• Remain in the attached cab
• Ensure the Train-lined Park brake is applied
• Isolate the VICERS key switch
• Isolate the Door Loop Bypass key switch
• Raise the Trip
• Apply and isolate the Automatic Air Brake
• Turn the Red EC cock
• Set the Foot Pilot Valve
• Press the Control Governor Bypass button as required
What 2 key switches must also be isolated on the Comeng train when performed a train rescue?
VICERS
Door loop bypass
If the trains have been coupled non electrically during a train rescue, what brake would be used to operate the 2 Comeng trains through the section?
Air brake
When encountering sticking brakes, with the train being stationary, what procedure do you follow
Check air pressure
Step 7 and to release
Apply min power
Let train roll to check
Stop at suitable location
If a driver has had to isolate 2 bogies on a 6 car train, and track speed for the area was 95km what is the max speed you can operate
85km
If a driver has had 4 bogies isolated on a 6 car train and track speed for the area was 80 km what is the max speed
Extreme caution
If the train has had more than 50% of it’s bogies isolated, how can the train be operated
Disabled. Needs to be rescued
What is the max permissible speed a train can be run at with locked axel/ skidding wheel on a trailing car
5km
What is the maximum permissible speed a train can be run at with locked axel/skidding wheel on the lead bogie
Disabled
After. A train with skidding wheels has cleared the section, what speed can the following trains proceed over the track until it has been certified
15km
If the brake block has passed the 10mm line, is the brake block still serviceable
Yes but needs to be reported as worn
If the metal backing of the brake block is making contact with the wheel, what must the driver do
Brake block is unserviceable and bogie needs to be isolated
What are the piston travel settings for a comeng train
30 to 65mm
After a bogie has been isolated, what additional requirements must a driver do after booking the fault with TC
Fault warning notice must be filled out
Fault warning stickers must be placed at both ends
What is the general speed rule with bogies isolated
Below 60km no speed reduction. Track speed over 60km must be reduced by 10km
If the control circuit breaker trips with the master controller closed ( O position), reverser in FORWARD, NEUTRAL or REVERSE, the brake controller handle in the applied position (1-7), The EP circuit breaker is set and the Rheo brake isolate switch in the NORMAL position, what is the most likely cause of the fault?
Short circuit between circuit breaker and master controller
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 in the train.
