LSM Flashcards
loss of overhead can be caused by
weak substation output
overhead failure
defective 1500v circuits
if you come to a stop after loss of overhead check
you haven’t derailed
TEC
secure train
PA
what’s on 1500
pantos
MAs
air compressors
traction equipment
associated circuits
faults with these may cause loss of overhead
when a loss of overhead occurs the system will automatically attempt to reset itself twice
if unsuccessful it will remain off until electol resets the system
what does LSM stand for
loss of overhead shutdown module,
detects loss of voltage in 120 and shuts down system of the train depending on speed and position of the BVICS
if unable to restore overhead metro will ask all drivers in the section to lower all pantos
press local MA EP stop
press local panto EP stop
observe pantos have lowered
the LSM should have lowered the trailing pantos automatically -
if the overhead resets it confirms there was a train causing it to fail, if not they know the problem is them
if electron resets when everyone pantos are down they will ask each driver to raise all pantos, one train at a time
once identified the driver of the defective train, they must lower all pantos
individually raise the lead and start the lead MA
obtain RTA SPB FULL CAB
go to leading centre and raise local panto and start local MA and continue until the defective is found, lower and isolate motors all out
go and raise the remaining panto and MA locally in the other 2 cabs
return to lead cancel RTA follow instructions, the train controller will then depart all trains in the area in one minute intervals and authorise drivers to raise all pantos, start all MAs and run in series until a location that has been advised
LSM no comms
never assume loss of overhead when no comms do trips switches gauges cocks and 110- check bell, LP is lowered, EP, if it doesn’t work check
240vAC items check:
non emergency saloon lights,
van area cab light,
headlights
if not operational try and restart the local MA, cab unattended and check and seat local MA over speed trip
lower and raise the local panto to ensure good contact with the overhead wire
proceed through saloon and raise the local
panto and attempt a local MA restart from leading centre motor, if unable to start the second MA then driver may assume loss of overh we and protect the train in the rear. if it’s not safe to do so adopt TOTS
do not check MA over speed if unsafe to do so
if power is restored while loss of overhead no comms
return to cab, raise all pantos and start all motor alternators
depart in series after 30 seconds for an up train
60 seconds for a down train.
advise train control at earliest opportunity
is you suspect distanced overhead do not exit the cab and keep the passengers on the train
emergency lights
saloon lights will extinguish after a short delay the emergency lights will come on, they have 2 hours
the battery charger fault light will flash to indicate if the driver needs to reset the emergency lights by turning the marker light switch and then back to auto
PA system
will stay operational for up to 2 hours, after that it will reset when emergency lights are reset
driver is not to enter a rail reserve without RTA
the LSM protects the over head from the train by shutting down systems in 110
how long is the LSM time delay relay?
4 minutes and speed threshold is 8km/h
this delay relay is only active in a loss of over head, it will commence timing down from 4 minutes to 0 once the BVICS has been closed- it will act differently if the speed is under or over 8km/h
LSM operation BVICS open lead car train over 8km/h
it will trip the EP causing LP flag to raise
leave local MAC on
shut down MA
run on air and stop at first available platform
LSM BVICS open lead car train under 8km/h
lead panto remained raised and MAC on
no equipment will be operational on the train
LSM bvics Closed trailing cars train moving over 8km/h
LSM will activate and set all MAC to off
MAs will shut down due to loss of overhead
