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General Traction > Comeng Traction Revision > Flashcards

Comeng Traction Revision Flashcards

1
Q

When might the LP flag raise?

A

*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

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2
Q

What are the 3 extra reservoirs on a KNORR?

A

Pre control
Ep
Supplementary

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3
Q

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

A

Activates a reduction in BP

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4
Q

What is the purpose of the traction overload button?

A

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

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5
Q

What gauges are located on the drivers dash?

A

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

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6
Q

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

A

110vDC

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7
Q

When is the control gov bypass used?

A

When operating train with RED EC isolated

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8
Q

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

A

Dc supply Light

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9
Q

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

A

Traction

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10
Q

What is the main switch for?

A

Isolates 1500vdc to the line breakers

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11
Q

What do bogie isolating cocks do?

A

Isolate air from brake unit to the brake cylinders

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12
Q

What is the input and output for the MA?

A

INput 1500DC
Output 415 AC

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13
Q

What equipment has an input of 1500DC?

A

MA,
Air compressors
Traction equipment

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14
Q

What equip does the MA power?

A

Air cons
Saloon lights
Traction cooling fan

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15
Q

What are the resets on the MA for?

A

To reset MA in the event of it over speeding

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16
Q

What are the auxiliary reservoirs for?

A

Store air for applying air brakes

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17
Q

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

A

15 min

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18
Q

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

A

Local Panto
RHEO
MA

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19
Q

What isolates are in the footwell of the drivers seat?

A

Uncouple
Whistle
Vicers

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20
Q

What does bvics control the flow of?

A

*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)

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21
Q

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

A

Speed at 0km
BP below 25kpa
Wait 10 seconds

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22
Q

When is the DDU active?

A

When bvics open
One Panto up
One MA on

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23
Q

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

A

3 min

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24
Q

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

A

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

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25
Q

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

A

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

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26
Q

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

A

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

27
Q

What does the control gov do?

A

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

28
Q

What does the anti neutralisation device do?

A

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

29
Q

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

A

Reinstate the red EC cock and isolate the yellow techav cock

30
Q

What are the brakes on a Comeng?

A

Rheo/EP
Automatic air
Spring park brake

31
Q

What are the 3 functions of the brake controller?

A

Charge, apply and release

32
Q

What is normal BP operating range?

A

550kpa

33
Q

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

A

275kpa

34
Q

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

A

250kpa

35
Q

What are the 3 positions of the brake controller?

A

Run and release
Service zone
Emergency

36
Q

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

A

By putting brake handle into run and release position

37
Q

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

A

Pre control res

38
Q

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

A

KNORR only

39
Q

How many steps of EP and how many effective?

A

7, but 1 & 2 are combined

40
Q

What speed does the Rheo operate in?

A

5km-115km

41
Q

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

A

Westside 35kpa

42
Q

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

A

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

43
Q

What does time notching refer to?

A

The automotive incremental increase in amps

44
Q

What does manual notching refer to?

A

Manual manipulation of master controller between shunt and series

45
Q

When would you use manual notching?

A

In low adhesion

46
Q

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

A

West: 6-8 turns anti clockwise
Knorr: 1 turn of knurled knob

Apply-
West: 40-60 turns
Knorr can’t be reapplied from outside

47
Q

When do spring park brakes automatically apply?

A

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

48
Q

What wheels are spring park brakes on?

A

1,3,5,7 of motor cars only

49
Q

What is the holding brake pressure on a westcode?

A

35kpa

50
Q

What are two sub units of vicers?

A

Vigilance recording and events control

51
Q

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

A

Below 250kpa

52
Q

What are the components of the brake controller?

A

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

53
Q

What is the normal brake pipe pressure?

A

550kpa

54
Q

What pressure from brake pipe is minimal reduction?

A

425kpa

55
Q

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

A

Pre control

56
Q

What speed does the Rheo operate in?

A

5km to 115km

57
Q

How does the spring park brake apply?

A

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

58
Q

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

A

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

59
Q

Where is the PLC located?

A

Above door 3 in every car

60
Q

What are the 5 items connected to the PLC?

A

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

61
Q

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

A

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

62
Q

What safety critical info is lost when PLC is tripped?

A

Door indications.

63
Q

What are the safety apparatus tests?

A

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

64
Q

What does the control res do?

A

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

General Traction (3 decks)

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