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Revision > HCMT Brakes/Pneumatics/suspension > Flashcards

HCMT Brakes/Pneumatics/suspension Flashcards

1
Q

What is the HCMT main res pressure?

A

850-1000KPA

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2
Q

What is the HCMT emergency brake cylinder pressure?

A

280-460KPA

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3
Q

What is the HCMT maximum brake cylinder pressure?

A

250-380KPA

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4
Q

What is the HCMT holding brake cylinder pressure?

A

140-240

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5
Q

What is the HCMT main res over- pressure safety valve?

A

1050

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6
Q

What is the HCMT main res safety loop activation pressure?

A

600KPA

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7
Q

What is the allowed amount of +/- KPA on the HCMT pressure gauge?

A

+/- 20KPA

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8
Q

BC pressures displayed on the analogue gauge in the drivers cab only indicate the pressure on which car?

A

That TC car

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9
Q

BC pressure displayed on the HMI indicate the pressure in which cars?

A

All cars during operation

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10
Q

What can cause the BC pressure displayed on the HMI to vary within range?

A

Car loading

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11
Q

How many air compressors does a 7 car HCMT have?

A

2

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12
Q

Where are the air compressors located?

A

On the B side of the Tc cars

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13
Q

What is the purpose of the air compressors?

A
  • To charge the Main Res
  • To maintain Main Res operating pressure
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14
Q

What are the air compressors mounted inside of?

A

Air Supply Unit (ASU) equipment case

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15
Q

How do the air compressors work to reduce wear on a HCMT?

A

The compressors alternate days operating as the primary compressor

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16
Q

When will the allocated secondary air compressor operate?

A
  • When the TMS identifies that the primary air compressor is unable to maintain MR operating pressure
  • During start up, when the MR has not yet reached operating pressure
17
Q

What does the Air Supply Unit (ASU) comprise of?

A
  • A compressor
  • Air dyers
  • Filters
  • Backup compressor governor
18
Q

Where is the Air Supply Unit (ASU) located?

A

Under frame of TC cars, B side

19
Q

Are the contents of the Air Supply Unit (ASU) required to be inspected by the Driver?

A

No

20
Q

How is the auxiliary compressor powered?

A

Battery powered

21
Q

Where is the auxiliary compressor located?

A

DMp cars

22
Q

When will the auxiliary compressor automatically raise the pantographs?

A
  • When there is insufficient MR pressure on the car to raise the local pantograph (train start up)
  • When the car has been isolated from the MR system
23
Q

Which pantograph will remain raised in the absence of MR air and why?

A

DMp car
The auxiliary compressor on the DMp car has a check valve that allows the compressor to raise the pantograph independently

24
Q

If the underframe panto isolating cock is isolated, what happens to DMp pantos?

A

The pantographs will not be isolated

25
Q

What air reservoirs are on the HCMT?

A

Main res, Surge res and Brake Supply Res

26
Q

Where is the MR located?

A

B side of every car

27
Q

What is the purpose of the main reservoir?

A

Store compressed air for use by the pneumatic equipment

28
Q

Is the MR pipe continuous throughout the train?

A

Yes

29
Q

What system will control and regulate the MR pressure during normal operation?

A

Train Management System (TMS)

30
Q

Can the MR be isolated on individual cars?

A

Yes

31
Q

How can the MR be isolated on an affected car?

A

By isolating the MR through cocks

32
Q

Where are the MR through cocks located?

A

B side of the affected car

33
Q

If the MR through cocks are isolated, what else must be isolated?

A

The MR through cocks on the adjacent cars

34
Q

Where is the MR end cock located?

A

Under the coupler cover on Tc cars

35
Q

What is the MR end cock fitted with and what does it do?

A

A check valve that prevents air venting when they open

36
Q
A

Revision (3 decks)

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