Comeng Faults - Electrics and ROBBDS

Question 1

When would a Local fault light illuminate?

Answer 1

When an overload is tripped in the traction equipment

Question 2

When would a Line Switch fault light illuminate?

Answer 2

Line breaker has failed to close on a motor car

Question 3

How would you try to eliminate a local or line switch fault light?

Answer 3

Pressing traction overload reset

Question 4

What two ways can extinguish a MA light?

Answer 4

Press the Aux start button or traction overload reset

Question 5

What does a steady air conditioner light mean?

Answer 5

No more then one air conditioner has failed in any one car

Question 6

What does a flashing air conditioner light mean?

Answer 6

Both air conditioners have failed in any one car

Question 7

Where is the air conditioning alarm circuit breaker located?

Answer 7

Above door 3 in the saloon areas

Question 8

Where is the number 2 air conditioner local faul lights located in a motor car?

Answer 8

On the ceiling in the saloon above door 3, 2 end of a motor car

Question 9

Where is the number 1 air conditioner local fault light in a motor car located?

Answer 9

In the drivers cab above the bulk head door

Question 10

How do you identify if a spring park brake is stuck on?

Answer 10

Park brake light and this car

Question 11

How do you lower and isolate a pantograph?

Answer 11

Push Panto Lower Ep Valve
Isolate pantograph ep isolating cock in van area
Isolate pantograph electrical toggle switch
Cut motors out
Submit tmm

Question 12

What is the first thing to look for when doing a ROBBDS test?

Answer 12

Trips
Switches
Gauges 
Cocks
Door closed button is illuminated
Supply light is on

Question 13

How would you verify 110vdc is running through the train?

Answer 13

Supply light
Bells work
LP flag is low and ep is operational

Question 14

What are the six steps for the ROBBDS test?

Answer 14

Reverse
Overload
Brake pipe
Bypass button (control governor)
Door loop bypass
Second controller

Question 15

Name the two types of fault types?

Answer 15

Persistent and intermittent

Question 16

Where are the air conditioner fault likes located in a trailer car?

Answer 16

2 end in the saloon area

Question 17

How is electricity supplied to the comeng?

Answer 17

1500vdc from the Pantographs to the MA which converts the 1500vdc to 415vac and 110vdc

Question 18

How many MAs per 3 car set?

Answer 18

2, one per motor car

Question 19

If one MA drops out, what is lost?

Answer 19

Half air con
Half saloon lights 
Half headlights
Half cab lighting and Heating
Local rheo where MA is located due to no cooling fan

Question 20

What causes an MA to become defective?

Answer 20

Loss of overhead
Air leak in MA contactor system
No main res
Over speed
Isolated cocks
Panto drops

Question 21

What is the difference between the 110vdc and 415vac circuit

Answer 21

110vdc is train lined

415vac is restricted to 3 cars

Question 22

When doing brake pipe reduction on a ROBBDS test, at what KPA do we reduce the brake pipe too?

Answer 22

325kpa

Question 23

What does the auxiliary to pantograph interlock isolate?

Answer 23

1500v to the MA and compressor

Question 24

What does the main switch isolate?

Answer 24

Cuts off 1500v to the line breakers and traction motors

Question 25

Where are the aircon lights in a trailer car?

Answer 25

2 end, above door 3

1 end above door 6