Comeng Faults Flashcards
Three locational Areas Faults occur?
Maintenance Examination
From a Siding
While in service
Fault Identification Methods are
Sight
Hearing
Touch
Smell
Fault Categories are?
Maintenance Faults
Serious Fault
Critical Fault
Rectified in Running
Re-Marshalled
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
What are some Whistle Defects ?
Sounding Continuously
Not Sounding
Tone too Low
What are the Initial Checks for the ROBBDS?
Trip
Switches
Gauges
Cocks
Ensure 110v DC supply available
The ROBBDS test includes:
R- Reverser
O-Traction Overload
B-Brake Pipe Reduction
B- Control Governor Bypass
D- Door Loop Bypass
S-Second Controller
What % of braking that is not available will the train be declared disabled?
50%
High Compressor Governor pressure ?
725 ( +- 20 ) kpa
Low Compressor Governor Pressure is ?
585 kpa
Main res Safety Valve pressure is ?
775 kpa
What does putting the Brake Controller into emergency do ?
Closes the Charging Valve
Main Reservoir Defect in a Trailer Cab are ?
Doors
Air suspension
EP BRAKE
Main Reservoir Defect in a Trailing Motor are ?
Panto
Air control Governor c/B
Release Park Brake
Motors out
Air Brake
Yellow cock
Main Reservoir Defect in a Lead Motor are
Whistle
Emergency Brake
What does the Door Loop Bypass do?
Enables traction power regardless of the state of the doors
What are the Fault lights connected to the Traction System ?
Local Fault light
Line Switch fault light
This Car light
What are some causes of traction Faults?
Control reservoir Faults
Pneumatic leaks
Traction overloads tripping
1500 v DC failure
Circuit breaker Failures
What are the Traction cut out switch positions?
All In (normal)
1&2 Out
3&4 Out
All Out
Steps for restarting the Motor Alternator?
Pressing the traction equipment reset button
Locally stopping + starting the inoperative motor Alternator
What brake pipe pressure cant be maintained that will declare the train disabled ?
425 kpa
What will Low control reservoir prevent?
It prevents the line breakers from closing and that the motor will not power
What are some 1500v DC EQUIPMENT?
Motor Alternator
Associated circuits
Traction equipment
Compressors
Pantographs
What is the control Reservoir pressure ?
490 kpa
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
