Pneumatic Faults Flashcards
What does the compressor gov do?
Monitors MR pressure and maintains it between 585 and 725
What happens when you isolate the compressor gov with the cock?
All the compressors will run continuously
When the comp gov has been electrically isolated what happens?
The compressor gov will be turned off for that tank but the compressor will still work because another governor will take over
How do you identify a comp gov defect?
The MR needle will fall below 580 before the compressors start up
How do you fix a comp gov defect?
Need to identify individual comp gov settings. Do it by tripping the CB and watching the duplex gauge to see if it now raises to 585-725. Repeat in other motors until defective gov is found
Can air compressors run continuously if required?
Yes
At minimum how much do you need in the BP to remain in service?
425
How do you deal with compressors running continuously?
If time permits
Trip comp gov CB and reinstate one at a time until you find the one that makes the compressors stop
What else is affected when you trip a comp gov CB?
Trainlined park brakes on off won’t work
Local will
What uses MR air? (10)
Door system
Panto
MA contractors
Air suspension
BP charging
Comp gov
EP braking system
Control res
SPB
Whistle
If MR pipe is defective in the leading motor, what position of the brake controller is available?
Only the emy position
If MR pipe is defective in the leading motor, do you need a C/E?
Yes otherwise declare disabled
If MR pipe is defective in the leading motor, what speed do you do and why?
Max 15 because your brakes are not fully operational
If MR pipe is defective in the trailing motor or any trailer car, what speed do you do and why?
Half track speed to max of 30 because your air suspension is deflated
What do you do if you have a ruptured MR tank
Close the MR delivery iso cocks
Place comp contractor iso switch to off
Trip Comp gov circuit breaker
How do you know you have defective air suspension?
Passenger complaint
Rough riding
Observed during train prep
What speed can you do with deflated or defective air suspension?
Half track speed max of 30km
Eg 70 becomes 30 50 becomes 25
What happens when there is insufficient control res air?
It will prevent line breakers from closing and that motor car will not power
Where is the whistle iso cock?
In the foot well
What can cause low control res pressure? (4)
Control res rupture
Rupture on trip latching lever
Pipe between MR and CR ruptured
Pipe between CR and Main equip ruptured
Leak between CR and CR in
Turn CR in
Motors all out
Leak on the other side of CR in
Treat as a MR defect
Motors all out
Leak between control res and control res out
Iso CR in
Motors all out
Leak between CR out and main equip case
CR out
Motors all out
CR leaking from trip latching lever
Iso trip latching lever switch
Trip cock in van area
Yellow if trailing
