Comeng Traction Flashcards
What is the BP pressure?
550kpa
What is the MR pressure?
585-725kpa
What is the control reservoir pressure?
490kpa
At what MR pressure will the LP flag raise?
<500kpa
What is the BC pressure in EP step 7?
250kpa
What is the emergency brake pressure?
275kpa
What is step 1 + 2 combined BC pressure?
70kpa
What is the BP minimum reduction pressure?
50kpa
What will the BP pressure be after a full service brake application on the air brake?
380-410kpa
What is the operating range of the regulating valve?
380-410kpa to 550kpa
What is the holding pressure of the BC on Westcode and Knorr?
- westcode -> 35kpa
- knorr -> 0kpa
At what BP pressure does the control governor open?
310-340kpa
At what BP pressure does the control governor close?
400-430kpa
What must the BP pressure be at for the trip to reset?
<25kpa
What is the minimum MR pressure required to raise the pantos?
500kpa
At what MR pressure will the safety valve operate?
775kpa
What is the BC pressure added for each step of EP brake?
35kpa
What is the variance allowed in pressures for this train type?
+/- 20kpa
What are the 6 parts of the primary safety apparatus? (TECHAV)
- trip
- emergency application valve
- control governor
- hand pilot valve
- anti-neutralisation device
- VICERS activation valve
What are the 4 parts of the secondary safety apparatus?
- foot pilot valve
- emergency pilot valve
- emergency control governor
- control governor bypass push button
When do you isolate the Red EC cock/yellow TECHAV cock?
- red -> if you are driving from the affected cab
- yellow -> if you are driving from another cab than the affected one
What 3 ways can a comeng be coupled?
- electrically
- pneumatically
- mechanically
Can a driver use/fit the transition coupler?
No
What 3 things run off the 1500vDC?
- compressor
- motor alternator
- traction motors
What does the control reservoir supply compressed air to?
- EP valves in main equipment case -> line breakers
- trip latching lever
What will happen to the compressors when the compressor governor isolating cock is isolated?
Compressors will run continuously
What 4 train cables run between each car?
- 2 outer cables = 415vAC
- centre cable = 110vDC
- lower cable = 24v CCTV
How long will emergency lighting be supplied for in the event of a power failure?
Up to 2 hours
What wheels are the SPB fitted to?
1, 3, 5, 7 motor cars only
What does the main reservoir do?
Receives, stores and cools compressed air
What does the auxiliary reservoir do?
Stores compressed air to feed into the BC while using the automatic air brake
What kind of brakes are on the westcode and knorr?
- westcode -> tread
- knorr -> disc
What 4 instances would cause the LP flag to raise?
- MR <500kpa
- lock out magnet valve denergised/loss of overhead
- BVICS closed
- EP MR cock isolated
What are the 6 cocks in a box from top to bottom?
- Panto/EP
- MA/EP
- Trip gear
- BP sensor
- Panto + MA
- EP MR
In the duplex gauge, what are the colours of the needles for MR and BP?
- MR = red
- BP = white
What are the 4 positions of the reverser?
- off
- forward
- neutral
- reverse
What are the 5 positions of the master controller?
- coast
- shunt
- series
- series parallel
- weak fields
What 2 instances will the SPB automatically apply?
- reverser to off
- 60 seconds after reverse is put into neutral
How often does the MAD button beep
Every 10 seconds
What 4 things happen when the train speed reaches 8km/h?
- SPB releases >8km/h
- LSM switch will lower all pantos except lead <8km/h
- CCTV cuts out >8km/h
- anti-neutralisation device activates >8km/h
What 4 things does the BVICS control?
- MR air to auto air brake valves in the brake controller
- electrical current to EP and rheo brake selector switches in brake controller
- electrical current to LP flag and lockout magnet valve
- electrical current to door monitoring circuits for blue saloon door closed lights
How many DC supply mcb need to be set for a train to remain in service?
1
What is the purpose of the door loop bypass switch?
Allow traction power to be gained when a FDCL can’t be rectified
What are the 6 pieces of safety equipment on every train?
- red and green flags
- first aid kit
- fire extinguisher
- switch stick
- ATWs
- ETCJC
Where are the saloon area mcbs located?
Above door 3
What 9 things does the PLC control?
- saloon door chimes
- secondary release feature
- door open and close buttons in drivers cabs
- door closing delay relay
- foot pilot valve
- FDCL relay
- control governor bypass flashing light and button
- secondary pilot valve
- door loop bypass controls
What are the 3 types of braking on this train?
- EP
- ED/rheo
- automatic air brake
What are the 3 primary functions of the brake controller?
- charge, apply and release the automatic air brake
- apply and release, or partially release the EP brake
- control rheo brake operation
What are the 3 positions of the brake controller for automatic air brake?
- running and release
- service zone
- emergency
What is the maximum entry speed into a platform?
55km/h
What’s the mininum BC pressure that should be in the gauge when stationary at a platform?
110kpa
Is wheel slide protection provided while using the air brake on a westcode?
No
What are the 6 valves in the brake controller?
- release prevention valve
- regulating valve
- relay valve
- charging valve
- lock out magnet valve and ball check valve
- emergency exhaust valve
What will happen if the hand/foot pilot valve is released while running on the air brake and the brakes are applied?
Brakes will release throughout the train
What does the release prevention valve do?
Prevents MR air to flow to the regulating valve when the brake controller is in the service zone -> brakes won’t release unless in running and release
What does the regulating valve do?
Reduces MR pressure to a control pressure which will then be duplicated in the equalising reservoir depending on the position of the brake controller handle. This will then be duplicated in the BP by the relay valve
What does the relay valve do?
Controls the flow in and out of the BP to a pressure set by the equalising reservoir
What does the charging valve do?
- allows MR air to flow to the relay valve to charge the BP
- is open in all positions except emergency
What does the lockout magnet valve and ball check valve do?
Prevents the simultaneous application of air brake and EP brake
What does the emergency exhaust valve do?
- vents BP air directly to atmosphere when an emergency brake application is made
- charging valve is closed when this valve is open
What does the equalising reservoir do?
Aids in the smoother operation of the relay valve when exhausting BP air to atmosphere when an air brake application is being made
What percentage increase in BC pressure does the restricted application limiting valve and ball check valve provide when going from EP to auto braking?
10%
What is the piston travel on the westcode?
30-65mm
At what speed does:
- rheo braking cut out
- brake blending occur
- rheo braking is operative/effective
- <5km/h
- 5-10km/h
- 5-115km/h
How is the SPB applied?
- spring applies when there is a reduction of MR air
How is the SPB released?
- MR pressure holds it off
How many turns are needed to manually release the SPB on a westcode and knorr?
- westcode -> 6-8 turns anti clockwise
- knorr -> 1 turn anti clockwise
How many turns are needed to manually apply the SPB on a westcode and knorr?
- westcode -> 40-60 turns clockwise
- knorr -> can’t manually apply
After how long will the powering step up from shunt?
After 20 seconds, then every 5 seconds after that up to series
When would you use manual notching?
Extremely poor adhesion due to wet/slippery rails
If VICERS is isolated, does the event recorder still record?
Yes
What equipment is task linked to the VICERS?
- master controller
- brake controller
- whistle
How long will the VICERS acknowledge button flash for then beep before emergency brakes are applied?
- flash -> 5 seconds
- beep -> 5 seconds
What are the 3 positions of the VICERS key switch?
- operate
- isolate
- test
Can a driver reinstate VICERS after it has been isolated?
No
What 4 things must happen in order to reset VICERS after it has activated?
- speed at 0km/h
- reduce BP to <25kpa
- wait 10 seconds
- press VICERS acknowledge button
What are the 4 requirements in order to be able to test VICERS?
- BP >500kpa
- reverser in off
- trip lowered and set
- BVICS open
What 2 ways can the trip be reset after it’s activated?
- brake controller to emergency
- depressing manual reset button on top of trip valve
If the BVICS is closed, after how long will the headboard and internal displays return to default?
3 minutes
When will the DDU become active?
When BVICS is opened
The TDN must be reinserted when the power has been off for how long?
3 minutes
After how long does a PEI time out?
90 seconds
If the PEI times out, what must the driver do?
- PA announcement when safe to do so
- ascertain if there is an emergency
What are the 2 types of the cab unattended procedure?
- full
- modified
When do you do a full and modified cab unattended?
- modified -> when remaining in the vicinity of the cab (i.e. wheelchair)
- full -> when leaving the vicinity of the cab (i.e. fault finding)
What are the steps when doing a full cab unattended if then returning to the lead cab?
- PA announcement if necessary
- marker lights to white
- reverser to off
- observe SPB light has illuminated red
- apply and isolate the air brake -> raise the trip, brake controller to emergency
- close the BVICS
- brake handle to run release and ensure BC pressure stays at emergency
- take controller key and portable radio with you
- close and secure cab
What are the steps when doing a modified cab unattended?
- leave BVICS open
- master controller in step 7
- marker lights to white
- reverser to off
- ensure SPB light illuminates red
- turn DTRS voulme up so you can hear it if it rings
- don’t need to lock cab door
Where are the primary saloon doors?
1 + 6
Where are the secondary saloon doors?
2 + 5
What are the 3 types of running brake test?
- low speed running brake test -> service brake
- running brake test -> service brake
- running brake test -> automatic air brake
When do you perform a low speed running brake test?
When docking out a previously prepared train
How do you perform a low speed running brake test?
- get train speed up to 5km/h max
- full service brake application
- bring train to a stand
- assess braking performance
Where are you not allowed to conduct the air brake test?
Inner suburban area
What 8 things could cause a FDCL? (POSTCARD)
- PLC tripped cars 2-6
- Open BVICS in another car
- Sensor (coupler)
- Train cable
- Control mcb tripped
- Auxiliary mcb tripped
- Rear motor lights in wrong position
- Door failing to close
Where is the PLC found?
Door 3 all cars
How long do the door chimes sound for if saloon doors aren’t proven closed after 15 seconds?
60 seconds
After how long will the control governor bypass button flash when running on the secondary circuit?
30 seconds
How long do you have to press the C.G. bypass button before the emergency brakes apply?
10 seconds
What will happen if you hold the VICERS button for 5 or more seconds?
Emergency brakes will apply
How do you introduce the secondary circuit?
- turn red EC cock
- set the foot pilot valve
- press the C.G. bypass button
What 3 ways can the pantos be raised?
- MR pressure
- Panto storage reservoir
- Panto emergency compressor
How long do you have for 6 and 3 car preps?
- post maintenance -> 60 / 30 minutes
- mainline -> 37 / 20 minutes
- pre-movement -> 18 / 10 minutes
- pre-departure -> 3 minutes
How long do you have to stable 3 and 6 cars?
- 3 cars -> 4 minutes
- 6 cars -> 8 minutes
From which car do you perform the panto test during a prep?
Trailing motor
What 4 functionality tests does a driver perform during a prep?
- brake
- hand/foot pilot valve and control governor
- VICERS
- trip
What test is not done on a pre-movement/revenue prep?
VICERS
How long must the van area cock be opened for when doing continuity?
15 seconds
Within how long must the BP recharge over 425kpa during continuity?
- 3 cars -> 20 seconds
- 6 cars -> 40 seconds
Within how long must the pantos drop when doing the panto test?
10 seconds
When attaching to another train, how short of the other train must you stop?
1m
Can you attach to a stabled unit?
No
From which cabs must a 2 person continuity be done?
The 2 centre cabs
Can 1 person do continuity on their own?
No, must do a mainline prep
Before dividing a train, what must the driver do from the centre cab?
Bunch up procedure
When arriving at the trailing cab when stabling, what is the first thing a driver must check for?
Train is in clear
When rostered to stable and the temperature is >25 degrees, what must the driver do?
Leave pantos raised
How long must the panto down button be held for when stabling?
5 seconds
How long will the red tail lights stay on for after stabling?
15 minutes
What volatges does the motor alternator supply?
- 415vAC
- 110vDC
What sets the hand pilot valve?
Air pressure
What sets the foot pilot valve?
Electrical switch
What are the only 2 things that need to he checked before the functionality test on a pre-movement/revenue prep?
- BP test button
- whistle
What are the components of the brake unit?
- variable load valve
- restricted application limiting valve and ball check valve
- seven step relay valve
- restricted application magnet valve (motor cars only)
- triple valve
- release ensuring valve
- dump valve
- bypass check valve
- hand release valve
What does the variable load valve do?
Monitors air pressure in the air suspension system
What does the restricted application limiting valve and ball check valve do?
Allows a 10% increase in BC pressure when using the air brake above the available for EP braking
What does the seven step relay valve do?
Converts the electrical code signals from the brake controller into 7 equal steps of air pressure during EP braking
What does the restricted application magnet valve (motor cars only) do?
Prevents simultaneous application of EP brake while rheo braking on motor cars only
What does the triple valve do?
Charges, applies and releases the air brake from the auxiliary reservoir
What does the release ensuring valve do?
Removes a small amount of pressure from the auxiliary reservoir when brake handle is in the run and release position when operating on the EP brake to ensure the triple valve is in the released position
What does the dump valve do?
Ensures sticking brakes don’t occur by reducing the air pressure in the auxiliary reservoir
What does the bypass check valve do?
Provides a passage for the MR air to reach the brake cylinders when the air can’t pass throught the triple valve during EP braking
What does the hand release wire do?
Provides a manual release of BC air pressure on that vehicle during brake defects or maintenance
