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Comeng Faults > Electrical Faults > Flashcards

Electrical Faults Flashcards

1
Q

What does the Local fault light mean?

A

There is an overload on a MC

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2
Q

What do you do to attempt to fix it?

A

Press Traction Equipment Reset button

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3
Q

What does the Line SW fault light mean?

A

A line breaker (motor) has failed to close on a motor car

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4
Q

What do you do to attempt to fix it?

A

Press Traction Equipment Reset Button

If that doesn’t fix it isolate motors

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5
Q

What does the MA fault light mean?

A

A MA is not running on a motor car

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6
Q

What do you do to attempt to fix it?

A

Press the Aux. Start button … if that fails …

Attempt to reset with Traction Equipment Reset button, or on a WestCode go and reset the MA

(A couple of OJTs I was with held down Aux. Start and Traction Reset button simultaneously for 5 seconds)

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7
Q

What does the Rheo Brake fault light mean?

A

The Rheo brake has failed to set up correctly.

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8
Q

What do you do to attempt to fix it?

A

Press the Traction Equipment Reset button.

If that doesn’t work …

isolate the Rheo by flicking the Rheo toggle switch.

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9
Q

What does it mean if the This Car fault light is illuminated with any of those fault lights?

A

The corresponding fault is on this MC

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10
Q

What does a STEADY Air Cond. fault light mean?

A

No more than one AC has failed on any one car.

With This Car fault light it means no more than one AC has failed on this car

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11
Q

What does a FLASHING Air Cond. fault light mean?

A

At least one car has both ACs failed.

With This Car fault light it means Both AC on this car have failed.

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12
Q

When the train is stopped … What does it mean if the Wheel Slip light is illuminated?

A

there is a fault in the wheel slip UNIT

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13
Q

When the train is in motion and the wheel slip light illuminates what does it mean?

A

There is a difference in speed greater than 15kmh between axles on one MC or TC during powering or braking.

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14
Q

What equipment does the Control CB supply 110vDC to? (6)

A

Master Controller and Reverser

Traction equipment reset button

Remote pantograph raise and lower button

Electric brake demand circuit

Speedo

Control Governor

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15
Q

What happens when the Control CB trips?

A

You have to find the fault because the MCH will be affected, therefore the train cannot be driven from the leading motor

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16
Q

What do you do if the Control CB trips when you push the remote pantograph RAISE button?

A

Raise Pantographs manually by using local Panto EP button on each car.

Submit TMM

17
Q

What do you do if the Control CB trips when you push the remote pantograph LOWER button?

A

Reset the Control CB

Electrically isolate the pantograph EP valve

Press remote pantograph lower button

… if the CB remains set, the fault is in the EP valve. Manually lower and isolate the pants (electrically and pneumatically) and submit TMM

18
Q

What happens if the Control CB trips in the trailing MC?

A

You have to go and reset it because you will get FDCL and will not be able to power.

19
Q

What are the other things in the trailing MC that can give you FDCL?

A

Control CB

Aux. CB

Marker lights wrong position

Second BVICS open

20
Q

What equipment, if defective, may cause the Control CB to trip?

A

Master Controller

Train Cable

Reverser equipment

Traction power control equipment

Rheo brake demand circuit

… on any MC in the consist

21
Q

What is the probable cause if the Control CB trips with:
- MCH 0
- Reverser OFF
- Panto RAISE/LOWER not pressed
- BCH in RELEASE

i.e. just arrived at cab

A

A short circuit between the Control CB and Reverser/ (MCH)

EXAM!!

22
Q

In this instance, what can the driver do?

A

You need a CE to power train from another MCH

You need a train to assist you clear of the line

23
Q

What is the probable cause if the Control CB trips with:
- MCH 0
- Reverser FORWARD, NEUTRAL,
- EP CB set
- BCH in 1-7

i.e. as soon as reverser moved from OFF

A

Rheo and EP brake energised (even if stationary) so …

Short circuit on electric brake demand wire in Train Cable

Fault in Rheo brake control equipment on any MC

24
Q

What can you do to rectify?

A

Step 1

Isolate Rheo via Rheo isolating switch
- attempt to reset Control CB
- if still won’t set

Step 2

Trip EP CB to remove electric brake demand from the whole train

25
Q

What does the Train Cable do?

A

Carries 110vDC for various train lined circuits and equipment.

26
Q

If Control CB trips what happens to Remote Pantograph UP button?

A

Panto’s cannot be remotely raised

27
Q

If Control CB trips what happens to Remote Pantograph DOWN button?

A

Panto’s cannot be remotely lowered

28
Q

If Control CB trips what happens to Overload Reset?

A

Overloads cannot be reset

29
Q

If Control CB trips what happens to Master Controller?

A

Cannot supply traction power in one or all powering positions

30
Q

If Control CB trips what happens to Rheostatic Brake?

A

Failure of the Rheostatic brake

31
Q

If Auxiliary Control CB trips what is affected?

A

Bell will not operate

Aux. start button will not remotely start MAs

Doors will remain in whatever position they are in

Saloon Lights will remain in the state they were in

Couple and Uncouple buttons

Air Con

Self-centering device on Scharfenberg coupler

32
Q

What do the MAs do?

A

Convert 1500vDC into 415vAC for BATH, and supplies 110vDC supply

33
Q

How many MAs are needed to operate a train?

A

One - in a degraded mode

34
Q

If one MA fails what is the result?

A

Half saloon lighting in each car

Half AC in each car

Half cab lighting and heating

Local Rheo brake where MA has failed will be inoperative

35
Q

What happens if an MA overspeed?

A

You have to inspect and reset it.

Only on a GEC MA (WestCode)

Not of high importance and should only be inspected in a Siding environment.

36
Q

How many DC Supply CBs need to be set for the train to run.

A

Only one out of 4 and the train will run fine.

37
Q

What do you do if the Control CB trips with MCH in 1-4?

A

Establish if you can drive in certain notches

Power in lower notch.

38
Q

What do you do if the Control CB trips when MCH just in notch 1?

A

Motors to ALL OUT

Reset CB try for power

39
Q

How do you isolate a pantograph?

A

Push the PANTO LOWER EP VALVE

Turn the PANTOGRAPH EP Isolating Cock in van area cabinet

Isolate the PANTOGRAPH ELECTRIC TOGGLE SWITCH

Turn Motors to ALL OUT

Comeng Faults (11 decks)

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