comeng Flashcards
compressor governor sync circuit breaker
used by maintenance personnel.
eg if this main res was isolated, the governor would tell the others that it was at 0 and they had to work harder
compressor governor circuit breaker
linked to SPB brake button for that car
use this CB to stop the compressor from governing
compressor contractor switch
turns the compressor OFF, is located near the trip
compressor governor isolating cock on the underframe will
keep the compressor running continually
why would you isolate a panto?
damaged
faulty 1500v equipment
control circuit braker trips
how do you isolate a pantograph
push the panto lower EP valve
isolate the van area cock
isolate electrically with toggle
isolate traction motors so the local and line switch fault lights become free
you’ve now lost MA and AC and Traction motors
main res is fine
what do you lose when one MA goes out on a unit
half air con
half head lights
half saloon lights
you only need one MA per unit for 110 so the rest is fine
what could cause an MA failure
electrical failure of 1500
air leak in the MAC system
loss of main res supply (for MAC)
MA over speed
MA or panto MA isolating cock turned
a panto lowered
what lights indicate an MA failure
Air con light, if steady one is out, if flashing 2 / both are out
how can you tell if an MA has had an over speed trip?
look at the MA, the over speed trip is underneath a GEC and on the side of a mistsubishi
if a GEC trips it will stop running- no sound
if a mitsubishi trips it will keep running and make a sound but no 110’or 415 output
how many DC supply circuit breakers do you need to be instead for a train to run
1
what happens to GEC motor alternators if the DC supply trips?
they will over speed, and oh must reset the DC supply before you reset the MA or they will just over speed again
what happens if you isolate the compressor governor?
it detects 0kpa causing the air compressor run continuously
when you isloate a compressor governor with the CB
other governors will still govern and run the compressors, it won’t turn the compressor off on the comp contact or switch will do that
will a shirt circuit in the DC supply train trip all DC supply circuit breakers
yes
if there is a faulty compressor governor how will you know?
fluctuation in main res between low and safety valve setting. you might hear the safety valve if it’s in the lead cab if you hear it and the main red is 700 it’s a faulty safety valve but to identity which control governor is defective trip each circuit breaker individually until you get a steady needle on MR
why pressure is the safety valve set?
775
if the compressor is running continuously what might you have
a defective governor, trip each until until the compressor stops operating
or
there is a compressor governor isolating cock turned on the underframe
what runs off the main res?
door system
air suspension
EP
SPB
panto
BP charge
control res
whistle
MAC
compressor governor
how can you tell if the leak is main res
go to emergency if the MR needle drops it’s MR issue
how to identify loss of MR
gauge drops
compressor runs continuously
LP flag raises
how can you find a main res leak
cut out and go for a walk
if your leak is in the lead carriage and there is no CE available
disabled
if there is a MR leak in the lead and a competent employee is available
manual release SPB
lower isolate panto
motors all out
move passengers
door loop bypas
isolate VICERS
isolate compressor governor
no airbags
no whistle
one MA
the CE will chanrge the BP and then close BIVICS from another motor car
power/brake from the lead with the BIVICS closed
emergency brake only
max 15
if the MR leak is in any other car than lead motor do you need a competent employee
no
if you lose MR and the leak is in another motor car
you just turn the yellow techav
BIVICS can be open in the lead
power brake as normal on the air
max speed 30
what do you do if the main res tank is ruptured?
isloate delivery cocks
compressor contractor off
isolate compressor governor
if the automatic drain valve is broken
same as reuotured MR tank and tie off the rubber hose
if you can’t blank the hose bogie 1 will lose brake cylinder pressure
if the MR hose between cars breaks
close the cocks on either end
safety valve may blow occasionally as the pipe is not continuous but everything still has MR
what the valves of the brake component
charging valve
lock out magnet valve
emergency application valve
release prevention valve
regulating valve
which cars do you need a competent employee to move the train with a brake pipe defect
which brake would you use
1,2,3,6
air
what is the max speed in brake pipe rescue
15
if you get a rupture in branch between brake pipe to triple valve
isloate brake pipe to triple valve isolate MR to step 7
hand release brakes on affected car
no bogies on this car
speed is 80% bogies out
when do you need a competent employees to move then train with main res pipe rupture
motor car 1 only
when testing for continuity what should the brake pipe pressure be and what timing
wait 15 seconds watch it drop below 300
charge to above 425 in 40 seconds (cars or 20 seconds 3 cars)
what if the aux circuit breaker trips in the last cab
flashing door close light
speed restriction a branch pipe rupture
2 less bogies so 10km under to 60
