Siemens Underframe Equipment Flashcards
How is trip lowered? Automatically or Manually?
Automatically as soon as cab is activated
However it needs to be reset before EMY brake will release
How is trip powered on a Siemens?
Air
Electrical
or Mechanical?
Electrically
How do we know trip has been activated and how can it be reset?
Trip reset switch will illuminate RED
RESET procedure:
- Train must be stationary
- MC must be in 0 (COAST)
- Turn trip reset switch to the right and it will spring back
What is the purpose of the Towing unit?
It reads to and from the brake unit during a
NON- ELECTRICAL rescue
The Isolation Cock needs to be in line with the pipe
Must be in Brake Pipe Mode (key switch in ‘I’ to be active
- more info page 10
When operating a Brake Pipe Rescue using the Towing unit how must the trains be coupled?
Electrically
Pneumatically
Mechanically?
Must NOT be coupled Elecetrically
When Brake pipe mode is in Off position what does that mean?
Brake system on train is operating normally
(Not in rescue, not using towing unit)
When in Read Mode (Towing unit operation) what is the Brake PIPE pressure when brake step in 0 (coast)
480 kPa
When in Write Mode (TU1) what are the Brake PIPE pressures at each step of the brake zone?
0 (COAST) is 550 kPa
Pressure Gradually decreases as you move to higher braking effort
Emergency brake is 300 kPa or less
What is the purpose of the Towing cock?
It is used to reduce the Main Res pressure between the Siemens and the Comeng when performing a Train Rescue
(So Comeng safety valve doesn’t activate due to overcharging)
Main Res pressure when Towing cock is used?
700 kPa
(This will cause uncouple light to flash in all cabs)
Gauges in all other cabs on Siemens will show normal MR pressure (850-1000)
What are the 2 valves on the B side of a coupler?
Extend Air
Retract Air
What can we check to ensure correct coupling ?
(Nuts and dicks)
Dick is in
Nut is out
What is the purpose of the manual valve on the coupler?
To completely isolate the whole pneumatic system of the Dellner coupler
What is the purpose of the extend air valve on the coupler?
Stops the electric coupler doors from opening when coupling
What is the purpose of the manual valve retract air on the coupler?
Stops the doors from retracing when uncoupling
What is the purpose of the rip cord on the coupler?
Allows for mechanical uncoupling (not used by drivers unless emergency )
What is the purpose of the electrical coupler handle on top of coupler?
Allows for manual electrical uncoupling (not used by drivers) to uncouple)
What is the purpose of the resistor grids?
Used for ED braking
They dissipate heat and energy that cannot be returned to overhead wires