Faults and Isolation Cocks

Question 1

What can cause uncontrolled brake applications

Answer 1

• any emergency plunger activated
• any PBC in emergency
• Faulty safety systems- AWS, ATP, TPWS, DSD, DVD
• Low main res air detected, (Below 5.5 bar)
• Master switch not in Forward/ Reverse
• Traction (Door) interlock
• Drum switch not opening/ closing, (could be because of train division)

Question 2

What actions should be taken if the main compressor stops working?

Answer 2

• first check the train is receiving power- line light / VCB indications
• (with authority) use the main compressor reset switch (located in DMOS1, saloon MCB cupboard)
• to reset, turn anti- clockwise to 9 o’clock and then back to 12 o’clock

Question 3

When would the compressor governor isolating cock (CGIC) need to be operated?

Answer 3

• if the compressor governor becomes faulty and stops running the CGIC will allow the main compressor to run continuously

Question 4

Actions if Brake control unit fails whilst in service?

Answer 4

[ Red fault will display on TMS ]
- contact signaller and advise of delay

• contact MTRC control who will patch you through to Siemens depot
• You may be advised to trip the BCU MCB for the affected vehicle

Question 5

If you lose power from the OLE and your train starts to load shed, how can you increase the effectiveness of the load shed?

Answer 5

• Move passengers to other vehicles

- trip out the lights in the empty vehicles

Question 6

What should a driver do following an ADD activation?

Answer 6

• Stop immediately to prevent any further damage to the OLE
• Contact the signaller and await instructions
  (you may be asked to inspect the OLE)

Question 7

If the pantograph fails to rise after cutting in the train from dead, what might you be advised to do?

Answer 7

• Check the auxiliary compressor motor switch, (located in MCB 357 cupboard, PTOSLW)

Question 8

When would Air suspension isolating cock (ASIC) be used?

Answer 8

• if there is an air leak from the suspension, using the ASIC will reduce the risk of losing Main Res pressure
  (if isolated, train must be taken out of service at the next available station- must not exceed 30mph)

Question 9

When the emergency haulage isolation cock (EHIC) need to be used?

Answer 9

• to supply air through the schrader hose if you are coupling to up to something other than a 360

Question 10

If you isolate the horn (HIC), what else will be isolated?

Answer 10

it will also isolate the air from the external cab doors

Question 11

What is the function of the parking brake isolation cock (PBIC)?

Answer 11

if the parking brake cylinder develops a leak, the PBIC will stop the main air system from replenishing the air causing the main res pipe pressure to fail