240v AC - 110v DC Supplies

Question 1

What voltage is the auxiliary converter powered at and what is its primary function?

Answer 1

The converter is powered at 240v

It’s primary function is to provide 110v DC control supplies for the units DC equipment and also provides battery charging.

Question 2

How is the auxiliary converter protected?

Answer 2

Auxiliary control MCB located in the TS MCB panel

Question 3

What’s indications will the driver receive If the auxiliary control MCB trips?

Answer 3

Battery charging light will go to red and your interior lights will revert to emergency lighting.
Must key out to check general fault light is on In DMS and auxiliary converter fault light will be on in the TS.

Question 4

What potential faults can occur in relation to battery charging and auxiliary converter? And what remedial actions can you take?

Answer 4

The auxiliary control MCB could trip. The auxiliary light on the TS will be illuminated.

Try to trip MCB back in.

If not then lower pantograph, press aux trip/off button , then aux on and pan up for a full reset.

If it can’t be reset then unit must be withdrawn from service within 40 minutes

Question 5

What systems run off the 110v DC Supply?

Answer 5

AWS,DRA,DSD,Vigilance.
Auxiliary compressor. Door control equipment
Brake unit. Emergency lights
Cab lights All exterior lights
GSM-R. PA Passcomm
PBC. Saloon lighting
Wheel slip equipment.

Question 6

What systems run from the 240v AC Supply?

Answer 6

5 main things:
Main compressor 
Aux converter
Traction converter fans
In train heating 
Main transformer oil pump.

Auxiliary converter 
Cab heating            Main compressor
Shore supply.          Immersion heater
Main transformer oil pump
Retention tank heater
Saloon heating.      Toilet extractor fan
Traction converter case fans
Voltage transformer in toilet

Question 7

How do the MCBs work on DC circuit?

Answer 7

Work on heat so if it exceeds the ampere rating it will trip.