Electrics Flashcards
Where are the pantographs located?
No. 2 end on Mc
What is in the High Voltage Container?
HSCB / Earthing switch
BCU
(Same as Auxiliary Container on TCar)
What do the HSCB do?
Disconnects traction equipment from overheads when there is a current oversupply.
What does the Traction Inverter do?
Converts 1500vDC to 3 Phase variable AC for use by traction motors
What does the TCU do?
Receives signals from MCH to control power, braking and holding brake
What happens if there is a defective traction motor?
Self-isolated. Driver just reports fault
What do SIVs do?
Convert 1500vDC to 400v AC to power BATH
(on exam ‘T’ may be TCU or fan)
And further step down transformer produces 240vAC for GPOs
What happens if one SIV fails?
All equipment still works but AC at 50% capacity
What does the battery charger power?
Everything that is train lined - 110vDC
What do the Batteries power? (4)
Initialising start up systems
Raising pantographs
Step light
Desk light
When loss of overhead or if both SIVs fail they will supply power for limited amount of time.
How do you raise pantographs?
Key in and on
Park brakes applied
Wait until all buzzers have stopped
Press Panto UP
Observe they have gone up
What happens to indicator lights when pantographs have raised?
Extinguish - Panto Up Button
Illuminates- Line Voltage
How can you lower pantographs? (2)
Stable Button
Pantograph Down Button
How do you lower the pantographs via Stable button?
Master key OUT
Press STABLE
Observe pantos down and Line Voltage light extinguished
Where is the Pantograph crank handle?
RHS door 2 of DM car. (not immediately RHS, next one down)
No. 2 End
How do you raise the Pantograph manually?
STABLE
Trip Panto Motor CB
Open cabinet in saloon and Insert crank handle into socket
Turn clockwise, stop when resistance felt
Replace handle
Reset CB
Activate cab and press Panto UP button
Pantograph Test
If all pantographs fail to raise trip CB to isolate the pantograph
TMM
How do
You manually lower pantograph?
STABLE
Trip Pantograph Motor CB
Open cabinet and use handle to wind Panto anti-clockwise
Replace handle and close cabinet
Leave CB tripped
TMM
Where are the door control modules located?
Left of each saloon door
(White reset button)
When driver presses door close button what happens?
Audible tone for 4 seconds while doors close
Door close button flashes continuously until all doors are closed and locked
How many times will the doors attempt to close?
3
Then you have to try again
How long will doors remain open before they close automatically?
60 seconds
Where are DERs located?
LHS of every door
What happens when DER is pulled? (4)
Illuminate- DER light
FDCL
audible warning buzzer
PEI generates
What do you have to do if the Emergency Brake activates?
Bring train to stand
MCH to 0
(Different from Xtrap)
What are Main reasons emergency brake will apply? (8)
Semi- perm coupler fails
Coupler fails
Overspeed
BCU critical fault
Main res falls below 600kPa
Trip activated
VICERS activated
Safety Loop opened
What CBS can also cause emergency brake to apply?
Safety Loop
Auto coupler in centre cab (B)
Friction brake & monitoring (B)
Emergency brake valve
Door control train line
Cab manned
Train stable
How can emergency brakes be manually applied?
ESB
MCH to EMERGENCY
Release pilot valve
Master key switch to OFF
What happens when you bypass the Safety Loop and the Trip?
Safety System Isolate light comes on
You have to
Operate MAD button
Passengers detrained
When Safety Loop Bypass switch has been turned what will be isolated from Safety Loop? (7)
Main Res pressure relay
BCU major event relay
Hand & Foot pilot valve
Coupler fail relay
ESB
Overspeed relay
Vigilance System
How do you reset the Trip?
Master key in and on
Illuminated - Trip lowered
Reverser to FORWARD or REVERSE
MCH to 0
Emergency brake releases to holding pressure
How do you bypass the Trip?
Open MCB panel on bulkhead wall.
Insert controller key into Trip Bypass and turn to “I” position
What are the task linked activities that will that will reset VICERS timing cycle?
MCH
Whistle
How do you reset VICERS?
Bring train to a stand
MCH to COAST
Wait 10 seconds
Push acknowledge button
What happens to VICERS when Safety Loop and Trip Bypass are operated?
VICERS isolated automatically so
You don’t have to turn it off.
How do you test VICERS?
Train stationary
Cab active
Reverser/ master Selector FORWARD
MCH to COAST
Then push VICERS test button
