Comeng Traction Revision

Question 1

When might the LP flag raise?

Answer 1

*When MR falls to below 500
*When EP/Rheo Brake is switched out or loss of power to the lock out magnet valve
*when bvics is closed
* if EP or MA isolate is closed

Question 2

What are the 3 extra reservoirs on a KNORR?

Answer 2

Pre control
Ep
Supplementary

Question 3

What does the brake pipe test switch do when it is in and the bell button is pressed?

Answer 3

Activates a reduction in BP

Question 4

What is the purpose of the traction overload button?

Answer 4

Resets tripped overloads in traction system when traction motors fail to power or Rheo brake

Question 5

What gauges are located on the drivers dash?

Answer 5

Brake cylinder
Duplex gauge: MR red, BP white
Speedo
Amps
Control Res

Question 6

For train lined/remote Panto up and down buttons to operate, what power voltage must be available?

Answer 6

110vDC

Question 7

When is the control gov bypass used?

Answer 7

When operating train with RED EC isolated

Question 8

Which light on the faults status panel will illuminate to indicate that 110vDC is available?

Answer 8

Dc supply Light

Question 9

If the local and or line switch lights are illuminated, what equipment has a fault?

Answer 9

Traction

Question 10

What is the main switch for?

Answer 10

Isolates 1500vdc to the line breakers

Question 11

What do bogie isolating cocks do?

Answer 11

Isolate air from brake unit to the brake cylinders

Question 12

What is the input and output for the MA?

Answer 12

INput 1500DC
Output 415 AC

Question 13

What equipment has an input of 1500DC?

Answer 13

MA,
Air compressors
Traction equipment

Question 14

What equip does the MA power?

Answer 14

Air cons
Saloon lights
Traction cooling fan

Question 15

What are the resets on the MA for?

Answer 15

To reset MA in the event of it over speeding

Question 16

What are the auxiliary reservoirs for?

Answer 16

Store air for applying air brakes

Question 17

Under normal stabling conditions, how long will the stabling light flash for after lowering the panto’s?

Answer 17

15 min

Question 18

What are the 3 electrical isolate toggles on the right hand wall of driver dash for?

Answer 18

Local Panto
RHEO
MA

Question 19

What isolates are in the footwell of the drivers seat?

Answer 19

Uncouple
Whistle
Vicers

Question 20

What does bvics control the flow of?

Answer 20

*Main res air to brake controller to charge brake pipe
* electricity to EP/RHEO, LP FLAG AND LOCK OUT MAGNET, door monitoring circuit (door closed light)

Question 21

What are the 3 requirements to reset vicers and stop exhausting BP air after activation?

Answer 21

Speed at 0km
BP below 25kpa
Wait 10 seconds

Question 22

When is the DDU active?

Answer 22

When bvics open
One Panto up
One MA on

Question 23

After closing bvics, how long will DDU retain the TDN info?

Answer 23

3 min

Question 24

If the red EC cock is turned to isolate,
What equipment is introduced?

Answer 24

The secondary safety circuit which includes FEEC:
Foot pilot valve
Emergency pilot valve
Emergency control gov
Control gov bypass

Question 25

When on the secondary circuit, how do you charge the BP?

Answer 25

Must have foot pilot valve set and press control gov bypass button

Question 26

What is the timing cycle of the control gov bypass button?

Answer 26

Flashes every 30 sec and you have 10 sec to press it

Question 27

What does the control gov do?

Answer 27

Reads BP pressure and allows the contactors to open and close to gain traction power when BP pressure is at a safe range to operate train

Question 28

What does the anti neutralisation device do?

Answer 28

Prevents driver from placing controller in neutral above speeds of 8km

Question 29

If changing ends after having bypassed the primary safety apparatus, what must you do?

Answer 29

Reinstate the red EC cock and isolate the yellow techav cock

Question 30

What are the brakes on a Comeng?

Answer 30

Rheo/EP Automatic air Spring park brake

Question 31

What are the 3 functions of the brake controller?

Answer 31

Charge, apply and release

Question 32

What is normal BP operating range?

Answer 32

550kpa

Question 33

What pressure in the brake cylinder after an emergency brake application?

Answer 33

275kpa

Question 34

What pressure in brake cylinder after putting EP to step 7?

Answer 34

250kpa

Question 35

What are the 3 positions of the brake controller?

Answer 35

Run and release Service zone Emergency

Question 36

After making an emergency brake app, how are the auxiliary res recharged?

Answer 36

By putting brake handle into run and release position

Question 37

On a knorr, what reservoir aids the aux res for the air brake?

Answer 37

Pre control res

Question 38

What type of Comeng has wheel slide protection during auto air braking?

Answer 38

KNORR only

Question 39

How many steps of EP and how many effective?

Answer 39

7, but 1 & 2 are combined

Question 40

What speed does the Rheo operate in?

Answer 40

5km-115km

Question 41

Which Comeng has the holding brake, and what is the Brake cylinder pressure?

Answer 41

Westside 35kpa

Question 42

What would happen in Rheo braking if you go into emergency?

Answer 42

Brake cylinder would go from 0/35kpa to 275kpa

Question 43

What does time notching refer to?

Answer 43

The automotive incremental increase in amps

Question 44

What does manual notching refer to?

Answer 44

Manual manipulation of master controller between shunt and series

Question 45

When would you use manual notching?

Answer 45

In low adhesion

Question 46

How do you manually release the spring park brake on westcode? And a KNORR? And then how do you apply?

Answer 46

West: 6-8 turns anti clockwise Knorr: 1 turn of knurled knob Apply- West: 40-60 turns Knorr can’t be reapplied from outside

Question 47

When do spring park brakes automatically apply?

Answer 47

*By placing reverser to off * After 60 seconds with reverser in neutral

Question 48

What wheels are spring park brakes on?

Answer 48

1,3,5,7 of motor cars only

Question 49

What is the holding brake pressure on a westcode?

Answer 49

35kpa

Question 50

What are two sub units of vicers?

Answer 50

Vigilance recording and events control

Question 51

What is the BP pressure meant to be when uncoupling 2 units?

Answer 51

Below 250kpa

Question 52

What are the components of the brake controller?

Answer 52

Release prevention valve Regulating valve relay valve Emergency exhaust valve Lockout magnet valve & ball check Emergency exhaust valve Equalising reservoir

Question 53

What is the normal brake pipe pressure?

Answer 53

550kpa

Question 54

What pressure from brake pipe is minimal reduction?

Answer 54

425kpa

Question 55

On the Knorr, what reservoir aids the aux res for the air brake?

Answer 55

Pre control

Question 56

What speed does the Rheo operate in?

Answer 56

5km to 115km

Question 57

How does the spring park brake apply?

Answer 57

Main res air forces spring to off position. Lack of MR air will force the spring on. Air off, mechanical on.

Question 58

What are faults that can cause a flashing door close light?

Answer 58

Trailing marking lights off Second bvics opened Plc tripped in rear car Train sensing it is still coupled

Question 59

Where is the PLC located?

Answer 59

Above door 3 in every car

Question 60

What are the 5 items connected to the PLC?

Answer 60

Drivers door indication lights Door chimes Door closing delay relay Secondary release features Foot pilot valve

Question 61

If you can’t get a steady blue light what items would you check in the trailing cab?

Answer 61

Bvics open Aux cb Control cb Plc cb Marker lights are on

Question 62

What safety critical info is lost when PLC is tripped?

Answer 62

Door indications.

Question 63

What are the safety apparatus tests?

Answer 63

Brake test Hand/foot pilot valve Control governor test Vicers test Trip test

Question 64

What does the control res do?

Answer 64

Stores air from the MR to operate the electro pneumatic valves in the main equipment case and trip latching lever