General Electrical Flashcards
Do not stay in Notch 1 for more than?
5 seconds. This is to avoid burning out the resistors.
What are the 3 types of Jumper Couplings?
5 pin 415 V
- air-conditioning (K set)
- battery charging
- not connected between 4th and 5th cars.
42/44 pin 120V + 240V
Electrical heads 120V on newer trains.
What drives the camshaft on a K set to change notches 1 through to 4?
Pilot Motor
What do you call a Jumper that’s not inserted correctly?
A slack back jumper
How many AODs are there per train?
- Always with the Panto but on the other end No 2.
How do you set the Auxiliary Relay?
Pan Up button
How do you reset the Overload Relays?
Press the RESET button on the dash.
How do you reset the OCR / OVR?
Press LIGHTS ON to reset
Name the 2 1500V circuits?
Traction circuit.
Auxiliary circuit
What is the purpose of batteries?
1) Initial start
2) To close relays, contractors, and to provide emergency lighting.
3) Back up system if AOD stops or fails.
Before touching battery fuses, what safety actions must you take?
1) Pantographs lowered.
2) Reverser into Isolate.
What are the basic components of the Control Circuit?
Before The Idea Came To Me.
Battery Positive Train Control MCB Interlock Relay Control Governor Traction Interlocking Master Controller
How are line switches closed?
Air and electricity (120V)
What does the Control Circuit do?
Supplies a low tension feed of 120V DC to allow the Driver to energise the driving controls electrically.
How do you know you have Battery Positive?
Cab light or LED in speedometer.
How do you energise the Interlock Relay?
Cut in.
Reverser out of Isolate.
At what pressure does the Control Governor close?
350kPa
How do you test the Traction Interlocking works?
Press the T.I. TEST button
How do you test the Master Controller?
Release the deadman to check SAI cock is open. Make sure BP air is exhausting under driver.
How do you check all the jumper cables are connected?
Bell with Guard
Lower Pantographs and check all lowered.
Raise Pantographs and check all raised.
Which cocks must be open to make sure the Traction Motors Line Switches work?
Check the CRM and CR1 isolating cocks are open. 450kPa pressure required via the pressure reducing valve.
What is a relay, what does it do?
A relay is an electrical device that incorporates a solenoid-controlled switch to utilise current in one circuit to turn ‘on’ or ‘off’ the current in another circuit.
Which button do you press to set the Aux Relay?
Pan Up button.
Which button do you press to set the battery contactors?
The Pan Up button.
Which button do you press to reset the K set overload relay?
Press the RESET button.
Which button do you press to reset the HSB (high speed breakers)?
T set: RESET button. Master Controller to OFF. Doors closed. Press for 5 sec & wait 15 sec.
Which button do you press to reset OCR and OVR?
Press LIGHTS ON button.
How do you reset the Line Switch Protection Relay?
Master Controller to OFF.
Re-apply power (T set)
How do you set / energise the Interlock Relay?
Move reverser out of Isolate.
Which button do you press to set the Motive Power relay?
Pan Up Button (T set)
Name some key Circuit Breakers (MCBs)
Train control Control positive Vigilance control Auxiliary control Trailer main control Gate control (T set) Pilot motor (K set) Traction interlock TMS control Drivers Display DOIL Comp Gov / Comp Sync Main Lights Emergency Lights
Located in the No 2 ends of various cars.
What does the TMS do?
Indicates whether train systems are operating normally or in fault mode.
What’s the protection for the TMS?
TMS circuit breaker.
If traction interlocking not working on that car, notify Guard to be extra vigilant with doors.
What does the Master Controller do?
Used to control power to the traction motors, which in turn control acceleration of the train.
Camshaft Cars: K set- 1 notch no longer than 5 sec.
Chopper cars: T set
T set: can notch down power.
What does the reverser do?
Provides directional and isolation control through a voltage supply to equipment.
What are the positions of the Reverser?
Isolate
Reverse
Off
Forward.
What do Traction Motors do?
Receive high tension current from the overhead supply and convert the electrical energy into tractive force to drive the wheels.
The 1500V supply (high tension) is fed to the traction motors via the Pantographs.
Each motor car is driven by 4 traction motors, which are axle mounted, two on each bogie.
Camshaft motors are on which trains?
K sets.
Motors on Lead Car eg car 1, 4, 5, 8.
Chopper motors are on which trains?
T sets.
Motors on 2nd car eg 2, 3, 6, 7.
What’s the function of the Pantograph?
Provide high tension to the Compressors, AODs and Traction Motors.
What is the function of the AODs?
Provides power for the control / lighting circuits, air-conditioning and battery chargers.
What does the AOD need to work?
1500V
Air - Control Reservoir CR1, CRM
What are the protections for the AOD?
Auxiliary relay
Over current relay
Over voltage relay
High speed breaker
What voltages does the AOD provide?
120V DC
240V AC
415V AC
Which auxiliaries run on 415V?
Air-conditioning (all sets) Battery charging (T set)
Which auxiliaries run on 240V?
Main lights (K set) Fog Light (T set) Heaters Demisters Headlights
Which auxiliaries run on 120V?
Fault lights Main lights (T set) Doors (T set) Emergency fans Train Control Current Battery Charging (K set) Chopper Control unit (T set)
Two things you need to do to start the train:
1) Close the circuits
2) Raise the Panto
What protects the Traction Motors?
Overload Relay.
Which cars does a Motor Alternator supply?
1 motor/trailer pair.
What is the ‘Big Mac’?
200A Motor Alternator fuse.
3 elements required to start a train:
1) Low Tension
2) High tension
3) Air
What voltage does the battery charger need k set
415V from AOD to charge batteries with 120V
What 4 important things does the 120V power on a T set?
Control Circuit
Communication equipment
Doors
Pantograph Compressor
What does a magnet plunger need to work?
120V
What do you lose if the Aux Relay is tripped?
AOD
Battery Charger
Compressor.
What does the Control Governor need to work?
SAI cock open
350kPa
120V from interlock relay
Which piece of equipment does not trigger the FIL light in a fault?
Compressor.
