Underframe Flashcards

1
Q

What does the MR do?

A

Stores comp air for pneumatic equipment

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2
Q

Where is the MR located?

A

B side of every car

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3
Q

Where are the MR isolating cocks?

A

End of each car

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4
Q

What do the surge res do?

A

Supplies comp air to the air bag suspensions at each bogie

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5
Q

What do the brake supply reservoirs do?

A

Supply comp air to the EP valves to charge the BC

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6
Q

Where is the primary suspension?

A

Between the bogie frame and the axle box

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7
Q

Where is the secondary suspension?

A

Between the bogie frame and car body

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8
Q

What is the secondary suspension?

A

Air bags

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9
Q

What do the air suspension isolating cocks isolate?

A

Isolates the surge res for its bogie

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10
Q

What are the isolating cocks under the coupler cover? (5)

A

Uncouple device iso cock
Towing unit iso cock
BP end cock
MR end cock
Horn isolating cock

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11
Q

What is inside the brake control module of a Tc car? (5)

A

Brake supply iso cock
BC bogie 2 iso cock
BC bogie 1 iso cock
Tread scrubber iso cock
Sanders iso cock

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12
Q

Where is the BCU?

A

Inside the BCM of every car

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13
Q

What does the BCU do?

A

It’s a computer that controls the application and release of EP friction braking

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14
Q

What is the primary suspension?

A

Rubber laminated springs

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15
Q

What does the towing unit do?

A

Provides the means for HCMT brake control to interface with traditional brake pipe connections

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16
Q

What does the aux power supply container have in it? (3) (BAM)

A
  • aux inverter
  • medium voltage box
  • battery charger
17
Q

What is the purpose of the aux power supply system? (2)

A
  • Converts 1500v DC to 415v AC
  • powers the battery charger
18
Q

Where does 110v DC come from?

A

The battery charger

19
Q

How long do the batteries last for?

A

Min 2 hours

20
Q

What does the air supply unit (ASU) comprise of? (4)

A
  • main air comp
  • air dryers
  • filters
  • backup comp governor
21
Q

What does the shore equipment do?

A

Charge the batteries

22
Q

When does the trip lower?

A

When the master controller key switch is turned to on

23
Q

What’s inside the BCM of a DMp, Mp and DT car?

A

Brake supply iso
BC bogie 2 iso
BC bogie 1 iso
Park brake iso
Sanders iso

24
Q

What does the high voltage box do?

A

supplies power to the traction and aux power supply systems

25
Q

What’s in the HV box?

A

HSCB and harmonic wave detection device HWDD

26
Q

Variable voltage and variable frequency comprises of…? (2)

A

Two traction inverter
TCU

27
Q

What does the VVVF do?

A

1500 v dc to 3 phase variable voltage and variable frequency for powering the traction motors

28
Q

Where is the auxiliary compressor?

A

On DMp cars only

29
Q

What is the purpose of the aux compressor?

A

Air for the Panto when MR is low

30
Q

When will the aux compressor automatically raise the pantos? (2)

A

Not enough MR pressure
When car has been isolated from MR

31
Q

Where are the aux power supply containers?

A

Tc and DT cars