Xtrap Pneumatics Flashcards
What equipment uses Main Res Air?
Braking system
Trip
Horn
Auxiliary panel
Main Res pressure?
750 - 900 kPa
Main Res Safety Valve?
980 kPa
Brake Pipe Pressure (in normal operation)
0
Holding Brake Cylinder pressure?
120 kPa
Full service brake Cylinder pressure?
190 kPa
EMERGENCY Brake Cylinder pressure?
210 kPa
At what pressure do both compressors start operating?
When main res is below 650 kPa
At what pressure will one compressor shut down?
When Main res pressure reaches between 750 & 900 kPa
What do air dryers do?
Remove oil, dirt and water
What does compressor Gov do?
Tells compressor when to turn on & off according to Main Res pressure
If compressor Gov is isolated what will compressors do?
On a 3 car:
If already running they will continue to run without stopping
If it was already stopped they will remain in the state they are in.
On a 6 car:
There are 2 Compressor Governors so you must turn both cocks for the above to occur on both trailer cars
What does Auxiliary res supply air to?
Friction brakes (air brakes)
Main res pipe connects main res to which equipment?
Auxiliary res on all cars
Auxiliary pneumatic panels
Coupler
SPB
- also charges brake pipe when needed for rescuing
What are the 5 cocks in the Aux pneumatic panel?
Whistle. —
Uncoupling. —
Trip cock reset. —
Trip cock active |
Aux pneumatic panel |
What is the primary suspension ?
2 rubber mounted springs on either side of each axle box
What is the secondary suspension?
Rubber mounted springs
Bump stoppers
Vertical & Lateral Dampers
What are the 4 Braking systems on Xtrap?
(Not types)
Service Brakes
Holding Brake
Emergency Brake
SPB
When does EP friction brake (disc/ tread) apply?
Whenever ED is ineffective, when wheel slide occurs, ED removes and EMY braking
When ED braking is the only brake applied, do Tp car brakes apply?
No because Tp cars only have friction brakes ( EP)
Does EP brake continue to apply when train speed is under 0.5km / h?
No
The EP will release & holding brake will apply automatically on all disc & tread brakes.
What is the holding brake pressure of the holding brake when the master controller is on all braking positions and coast position?
Remains at 120 kPa as long as train is stationary
How can a SPB be released?
Manually by unlocking the release cable with an AX key, then pulling the handle
Cannot be applied
At what Brake PIPE pressure will EMY BRAKE apply (Safety loop opening) during rescue ?
At what pressure will Safety Loop close again?
When below 300 kPa
Will close again when above 430 kPa
What are the only settings of the EMS (EMY mode switch) that the brake pipe is charged ?
3 - Rescued
4 - Rescuing
5 - rescuing in propulsion
