Comeng Faults

Question 1

What does ROBBDS test mean?

Answer 1

Reverser
Traction overload reset
Brake pipe reduction
Control governor bypass
Door loop bypass
Second controller

Question 2

What does a local fault light mean?

Answer 2

Local fault light indicates a traction equipment fault, such as traction overloads or other protective devices being tripped

Question 3

What are some causes of traction faults?

Answer 3

Control res faults
Pneumatic faults
Traction overload tripping
1500v dc failures
Circuit breaker failures

Question 4

How many KPA does the control reservoir hold?

Answer 4

490 KPA

Question 5

What would happen if there is a rupture in the control reservoir or if the control reservoir out cock is isolated?

Answer 5

It will cause line breakers to remain open when the command for traction power is applied via the master controller.
A line switch fault light will occur and no amps will be supplied to that motor car.

Question 6

Can the driver re instate the main isolation switch?

Answer 6

No

Question 7

How many times will the overhead system try to reset itself after a loss of overhead power?

Answer 7

Twice

Question 8

What happens to the doors if overhead power is lost?

Answer 8

All the saloon doors will release

Question 9

After overhead power has been restored, at what intervals will the train controller depart trains?

Answer 9

1 train at a time at 1 min intervals.

Run in SERIES until the location that the train controller has advised

Question 10

What are the DC power items a driver must check to see if DC is available?

Answer 10

Bell is operational
Low pressure flag is lowered
Ep brake is operational

Question 11

What are the 240v AC power items to check after confirming all 110dc items are operational?

Answer 11

Illumination of non emergency saloon lights
Illumination of the van area cab light
Operation of headlights

Question 12

Does the PA system remain operational after a loss of overheads?

Answer 12

Yes for up to 2 hours

Question 13

What is the purpose of the L.S.M?

Answer 13

The LSM is designed to reduce the impact of 1500 v dc defects from overloading the substation when power is returned

Question 14

What is the LSM time delay relay set at once the BVICS is closed?

Answer 14

4 minutes

Question 15

What is the LSM speed threshold set at ?

Answer 15

8kmh

Question 16

In the event that overhead power is lost, each LSM will activate once the local motor alternator drops below how many dc?

Answer 16

Once the local motor drops below 95v DC
For 2 continuous seconds

Question 17

After how many minutes will the VICERS application valve open after a loss of overhead power?

Answer 17

After 5 mins has expired the VAV will open causing any brake pipe air in the system to exhaust to atmosphere

Question 18

What does a local fault light mean?

Answer 18

When the local fault light is illuminated it indicates an overload has tripped on a motor car

Question 19

What does a LOCAL fault light and a THIS CAR light mean?

Answer 19

This means an overload has tripped on that motor car

Question 20

How do you attempt to reset an overload?

Answer 20

Press the traction equipment reset button for 2 seconds.
If the fault light does not extinguish, the traction or rheostatic brake must be isolated

Question 21

What does a steady AIR CON fault light indicate?

Answer 21

1 air conditioner has failed

Question 22

What would an illuminated WHEELSLIP light while the train has stopped indicate?

Answer 22

This would indicate a fault in the wheel slip unit

Question 23

What would an illuminated WHEELSLIP light indicate while the train is in motion?

Answer 23

This would indicate a difference in speed greater than 15kmh between axels on one motor car or trailer car during powering or braking

Question 24

What is connected to the control circuit ?
7 answers

Answer 24

Master controller and reverser
Traction equipment reset button
Remote Panto raise button
Remote Panto lower button
Electric brake demand circuit
Speedometer
Control governor