Electrical Faults Flashcards
What do you have to advise passengers of when there is a loss of overhead?
- how long the delay will be
- any arrangements for transfer to an assisting train
- detraining arrangements
Any other necessary arrangements
How long will the battery last for with all aux systems running?
60 minutes
What are some ways to conserve the battery energy?
Reverser neutral
Key off
Headlights off
Cab light off
Use emy saloon lighting
Step lights off
What does the major fault indicate?
A MCB has tripped somewhere on the train
What does the major 2nd level fault indicate?
A MCB has tripped somewhere on the train
What does a minor fault indicate?
A MCB has tripped that a driver cannot access
What does aux fault indicate?
A SIV failure
What does the battery charger fault indicate?
A battery charger has failed (can be linked to SIV failure)
What does the 24 V converter fault indicate?
One or more 110vDC to 24vDC converters has failed
What does the air compressor fault indicate?
One or more air comp failed
What does low pressure in MRP indicate?
MR has fallen bellow 650
What does low pressure in BP indicate?
BP has fallen below 430 during rescue procedures
What does service brake fault indicate?
One or more faults in the service brake (ED brake)
What does 1 or more brake equip fault indicate?
One or more brake equipment fault
What does vigilance fault indicate?
VICERS system fault on this car
What does traction fault indicate?
Traction equipment has failed on this car
What does 1 or more traction equip fault indicate?
Traction fault somewhere on the train
What does speed input fault indicate?
One or more speed sensors or tachometers has failed
What does two HVAC stopped fault indicate?
Both air cons in one or more cars has failed
What does one HVAC stopped fault indicate?
One air con in one or more cars has failed
What does park brake applied fault indicate?
A SPB is applied somewhere on the train
What are the different voltages in operation on the Xtrap?
1500vDC
110vDC
24vDC
400vAC
220vAC
24vAC
What is the Safety loop negative power supply CB? And what fault light?
23Q2 major fault
What is the Safety loop positive power supply CB? And what fault light?
23Q1 major fault
What is the multiple unit relay CB? And what fault light would you get?
22Q6 major 2nd level fault
What is the BCU CB? And what fault lights would you get?
25Q1 major fault, low pressure in BP or service brake
Where are the trailer saloon MCB located?
Left of door 2
What CB are in the trailer saloon? (6)
Tachy unit 32Q1
BCU 25Q1
Panto 2 22Q10
Panto 1 22Q5
Aux inverter 2 21Q9.2
Aux inverter 1 21Q9.1
How many times can you try and reset a fault?
3 times
What are some faults that may be rectified by doing a train stable? (13)
Battery charger faults
CCTV
Compressor
DDU related faults
Failed traction test
Fixed train radio
HVAC
PA
safety loop
Service brake
SIV
traction
Speed input/tachometer faults
Stabling on the mainline procedure
TEC get permission to stable
PA
Close doors
Train stable button
High voltage presence light off
1 or more Panto down light on wait 5 sec
Remove key
Confirm pantos down
Wait 2 mins
Activate cab
When an Xtrap is stabled, how long do marker lights and emy lights last for?
15mins
If the step light is not illuminated what are the possible causes? (4)
- the light is defective
- the storage batteries are flat
- the batteries have been isolated
- the battery box fuse is blown and/or missing
If the battery switch is found to be on what can you assume about the batteries?
They are flat or the fuse has blown
How long after raising the pantos will the high voltage presence light illuminate?
30 seconds
If you start the train and the pantos haven’t risen what do you check?
Voltmeter
If the pantos haven’t risen and there’s no voltage what do you check?
Position of the battery box iso switch. If isolated report if not declare disabled
If the pantos haven’t risen and you have above 90 volts
Check the trailing Panto control buttons are not latched in. Try raise pantos from another cab
If you have tried to raise the pantos from another cab and they don’t raise what do you do?
Check 3 way switch in trailer car
Make sure Panto CB are set
What are the position of the 3 way Panto switch?
Auto
Manual raise
Manual lowering and iso
How do you isolate the Panto?
Stable train
Make sure pantos have lowered
Go to affected trailer Panto and switch to manual lower and iso
Activate leading cab and raise other panto
If you have to coast under something what do you need to do first?
Panto test
When coasting under something what do you put the EMS to?
Position 1 online holding brake inhibit
What happens if there are 2 keys in?
Emergency brakes
You get in the train and activate the cab but you find that another cab is operative, what do you do?
-cab to cab
- no response? check each cab for keys
- no keys? Activate and deactivate each cab to see which one is the problem it may also help rectify the fault.
- if none of that works train stable
- if that doesn’t work then the train can only be driven from the active cab so you may need a C/E. No C/E = disabled
Emy brake applied and won’t release, what do you check in the local cab? (11)
110vdc? (Cab fluro)
Trip lowered and reset?
ESB
Emy position of master controller
Hand or foot set?
Vicers activated?
EMS 2
MR above 580?
Another cab operative?
23Q1 &2 set?
Emy brake applied and not releasing what do you check in the other cabs?
ESB
Trips raised?
When using the safety loop bypass what else do you need to isolate?
VICERS
What do you loose when you use the safety loop bypass? (7)
Emy position of master controller
ESB
Pilot valves
Auto vigilance bypass button
Trip
Brake pipe pressure switch during train rescue
MR pressure switch
If you need to use the auto vigilance bypass switch what else do you need to isolate?
VICERS
When would you need to use the auto vigilance bypass switch?
Hand or foot pilot valve defects
When would you need to isolate VICERS? (4)
Fault indicator remains illuminated
Safety loop bypassed
Auto vigilance bypassed
Abnormal operation of VICERS
When the train is stabled how long will VICERS run on the internal battery for?
2 mins
If you loose one SIV on one unit what happens?
The other SIV will take over
The battery charger fault light may illuminate for 2 mins while they change over
Air con will be halved on the affected 3 car unit
One air comp will operate on the 3 car unit
If you loose both SIVs on one unit what do you loose?
Battery charger
Both air compressors
Both traction cooling fans
All HVACs
How do you rectify SIV faults?
Reset the C/B or train stable
What are the positions of the door motor iso switch?
Motor release
Motor isolate
Normal
Motor lock and close
To reset a DER which way do you turn the tri key?
Anti clockwise
What does the TCU do if there is a problem with the traction or brake equipment?
Tries to rectify the fault if it can’t it will auto isolate the applicable equipment
What are the indications of a traction fault? (4)
Traction fault light
1 or more traction equipment fault light
No green leds on the power indicator
Possible shuddering of the train while in motion
How do you rectify a traction fault?
Train stable if time permits
Activate each cab until you find the cab that has both traction fault lights and place traction iso switch to iso to remove the trainlined fault light
How many 110vdc/24vDC converters do you need on a 6 car train?
Min 2
How do you clear DTRS fault messages?
Press X
How do you reset the DTRS?
Deactivate cab
Trip and reset DTRS c/b
Activate cab
Enter TDN and do radio test
TMM
How do you isolate the DTRS and make the portable radio the main one
Deactivate cab
Insert portable
Trip DTRS c/b
Reactivate cab
TMM
What do you do if you have no fault lights or status lights?
Lamps test
