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Train Driving > HCMT Pnematics And Brake Systems > Flashcards

HCMT Pnematics And Brake Systems Flashcards

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Drivers Test flashcards
1
Q

What is compressed air supplied to?
(9 answers)

A

• Main Reservoir
• Pantograph
• Air suspension systems
• Electro-Pneumatic Braking Systems
• Trips
• Sanding Equipment
• Couplers
• Horns
• Driver and OJT systems

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2
Q

Main res pressure ?

A

850 - 1000

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3
Q

Emergency brake cylinder pressure on a HCMT?

A

280-460

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4
Q

Maximum brake cylinder pressure?

A

250-380

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5
Q

Holding brake cylinder pressure ?

A

140-240

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6
Q

Main res over-pressure Saftey valve?

A

1050

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7
Q

Main res saftey loop activation?

A

600

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8
Q

What does the ASU consist of?

A

• Main air compressor
• Air dryers
• Filters

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9
Q

Where are the two compressors for charging the main res located?

A

B side of Tc cars

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10
Q

When will the auxiliary compressor automatically raise the pantos?

A

• When there is insufficient MR pressure on the car to raise the local Panto
• When the car has been isolated from the MR system

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11
Q

What are the 3 types of reservoirs on this train?

A

• Main res
• Surge res
• Brake supply res

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12
Q

Where is the main res located?

A

B side of every car

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13
Q

What is the purpose of the surge res?

A

To supply compressed air to the air bag suspension

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14
Q

How many surge reservoirs are fitted to each car?

A

4

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15
Q

What is the purpose of the brake supply res?

A

To supply compressed air to the EP valves in the BCM to charge the brake cylinders

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16
Q

How can a Panto be raised?

A

• MR pressure above 700kpa
• The battery powered auxiliary compressor located on DMp cars will raise the local Panto, when insufficient MR pressure is present

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17
Q

Will the under frame Panto isolating cock isolate the Panto on a DMp car?

A

No

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18
Q

What does the saloon area Panto isolating cock do in the isolated position?

A

Isolate the flow of are form the auxiliary compressor to the Panto on DMp cars. The Panto will lower and be isolated so it can’t raise

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19
Q

What is the primary method to reset the trip?

A

Via the trip reset located in the OJT panel

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20
Q

If you need to isolate the trip due to a fault what cock would you turn and where?

A

Trip isolating cock which is located on B side between doors number 2 and number 4 on the Tc car

21
Q

If the trip bypass switch is operated what does it introduce?

A

The Saftey system bypass acknowledgement button

22
Q

What does the Post trip speed restriction do?

A

It restricts the speed of the train by cutting traction Power above 25km/h

23
Q

How long will the post trip speed restriction apply for?

A

500 seconds from the time the train commences moving after trip activation unless cancelled by driver

24
Q

Where is the horn isolation cock located?

A

Underneath the coupler cover on B side

25
Q

Where is the Drivers and OJt seat isolation located?

A

Beneath respective seat

26
Q

What are the 5 isolating cocks in the BCM on the Tc car?

A

• Brake supply
• Brake Cylinder End 2
• Brake Cylinder End 1
• Tread scrubber
• sanders

27
Q

What are the 5 isolating cocks in the BCM in the DMp, Mp and DT cars?

A

• Brake supply
• Brake Cylinder End 2
• Brake Cylinder End 1
• Park brakes
• sanders

28
Q

Where are tread scrubbers located?

A

Tc cars on wheels number 3 and 4

29
Q

Where are the 3 isolating cocks that will isolate the EP friction brakes?

A

• The saloon brake supply isolating cock ( one per car located under a seat in cabinet B06 near door 4)
• The Brake Control Module brake cylinder isolating cocks (one per bogie)
• The Brake Control Module brake supply isolating cock (one per car).

30
Q

When does ED braking become available?

A

Above 3km/h

31
Q

If 3 or more bogies are isolated on a 7 car set what will happen?

A

Train removed from service

32
Q

What happens During EP braking with up to 2 bogies isolated and brake manager active?

A

Train will request extra braking efforts and stopping should be similar to normal EP braking

33
Q

What happens During EP braking with up to 2 bogies isolated and brake manger inactive ?

A

Each car will brake independently with no additional effort, stopping distance should be close to normal EP braking (within 10%)

34
Q

What is the brake manager?

A

The BCU that controls brake management in normal operation and directs other BCUs
It is normal the BCU on the active cab

35
Q

What happens if ED braking system develops a fault?

A

EP brake will automatically take over
The TMS will automatically isolate and attempt to reset ED once master controller is in coast

36
Q

What do brake resistors do?

A

Absorb energy generated by traction motors and dissipates heat

37
Q

What is the speed threshold of the holding brake?

A

0.5
Holding pressure- 140-240

38
Q

The holding brake will not release unless?

A

• The safety loop is energised
• Brake demand is not registered
• Traction demand is registered above the defined traction threshold

39
Q

The saftey loop cannot reset until?

A

• The train is stationary for more than 3 seconds
• The reason for the emergency brake application is reset
• MC to Max Brake and Reverser to Neutral.

40
Q

What tasks are linked to the vigilance system?

A

• Vigilance acknowledge button
• Movement of the master controller
• Activating the horn
• Headlight/wiper/washer switch
• Safety system bypass acknowledge

41
Q

What % of power/ brake does the task linking system need?

A

5% with in a 3 second window

42
Q

Where does brake blending take place?

A

Between 10km/h and 3km/h

43
Q

Where are park brakes located?

A

On the axles of every car except the Tc cars

44
Q

How do you isolate the park brake?

A
  1. Pneumatically isolate park brakes
  2. Manually release the park brakes
45
Q

Where are the 2 park brake isolation cocks located?

A

• The saloon park brake isolating cock (located in cabinet B07 under a seat near door
• the BCM park brake isolation cock

46
Q

What does the primary suspension system consist of?

A

Rubber laminated springs

47
Q

What is the secondary suspension?

A

Airbags
dampers
Levelling valves

48
Q

How do you isolate the secondary suspension?

A

You must isolate both air suspension isolating cocks

Train Driving (91 decks)

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