Siemens Pneumatics & Cab Equipment COMMS systems

Question 1

Holding brake pressure

Answer 1

110 kPa

Question 2

B1 - B6 pressures

Answer 2

B1 - 57 kPa
B3 - B5 + 27 each step
B6 - 189 kPa

Question 3

Emergency cylinder pressure

Answer 3

280 kPa

Question 4

If a deadman’s switch (hand/ foot switches) is not set while train is above 0.2km/h what will happen? *

Answer 4

A tone will sound for 3 seconds and then EMERGENCY BRAKE APPLIES

Question 5

Why are they called hand and foot switches and not pilot valves? *

Answer 5

Because they are operated electrically not pneumatically

Question 6

How do we set hand switch?

Answer 6

Move 15* anti clockwise

Question 7

What is VICERS comprised of?
2 sub units

Answer 7

Vigilance control system
Event recording system

Question 8

What is the Vigilance Control System comprised of? (5)

Answer 8

• Task linking of driver controls (MC, whistle)
• VICERS acknowledgement button
• Buzzer
• Vicers Fault Indicator
• Vigilance Activation Valve/ Relay

Question 9

What will reset the Vicers timer?

Answer 9

Operation of the
• MC
• whistle
• Vigilance button when it flashes

Question 10

What warning will a driver get that vicers cycle has advanced towards EMY brake?

Answer 10

Vicers light flas for 5 secs
Audible buzzer for a further 5 seconds

If not pressed EMY brake applies

Question 11

What will happen if VICERS ACKNOWLEDGEMENT BUTTON is held down for more than 5 seconds?

Answer 11

Emergency brake will apply

Question 12

How will we know when to isolate Vicers?

Answer 12

A vicers fault light illuminates on the fault panel

Question 13

If pantos are lowered does that shut down the train?

Answer 13

No we must press the stable button otherwise the batteries will go flat

Question 14

Does the CCTV automatically turn on when cab is activated?

Answer 14

No you press the S button

Unless a DDA is pressed or a PEI is activated/ acknowledged

Question 15

What does the wheel slip status light indicate?

Answer 15

Yellow illuminated indicator when wheel slip is detected

EP and sanders will operate (ED may
be removed)

Question 16

When does overspeed indicator illuminate? *

Answer 16

When train exceeds 119 km/ h

Question 17

When TDN is entered on DDU does driver need to also input into TDN to DTRS ?

Answer 17

No it transfers automatically

Question 18

What indicates a DDA has been pressed?

Answer 18

DDA flashes WHITE 5 times and then remains steady

On pressing button CCTV will turn on

Question 19

Cab to cab indicator?

Answer 19

Flashes yellow until acknowledged

Question 20

PEI indicated how?*

Answer 20

Emergency Intercom button flashes Red
Tone emitted
CCTV activated once button acknowledged
Mic used to communicate with paxs

Question 21

What button to communicate with passengers?

Answer 21

Cab to saloon
Yellow when on
Use mic to talk

Question 22

Blue light flashing door close light can we get traction?

Answer 22

No

Question 23

When can yellow door release buttons not operate?

Answer 23

When train is above 0.2 km/h

Question 24

Cab speaker is activated when?

Answer 24

The switch is illuminated white

Default position is isolate on older trains
Need to unisolate to hear others speak

Question 25

When a PEI call is made when / how does cab speaker turn on?

Answer 25

Automatically

Question 26

What is EI (EMERGENCY INTERCOM) used for?

Answer 26

To respond to PEI CALLS

Question 27

When will CCTV come up on a PEI call?

Answer 27

When PEI button is activated

Question 28

What must be used to communicate with the passenger on a PEI call?

Answer 28

The microphone on the switch panel

Question 29

To what equipment does BCU send electronic signals ?

Answer 29

To & from TCU for ED SERVICE braking

To brake Modules for EP

….Info is processed and adjusted (weight, speed of train etc) via pressure limiting valve.
Then pressure goes to relay valve which allows corresponding AUX res air to enter brake cylinders

Question 30

When will EP take over during wheel slide on a DM car?

Answer 30

When braking effort falls below 90% of braking request

Question 31

How can ED be reset if lost during wheel slip?

Answer 31

MC into zero or any powering position
for

1sec +

Question 32

What does the Sanding Control unit operate in conjunction with?

Answer 32

BCU
& Wheel slip unit

Question 33

Shen does a red LED illuminate on the sand boxes?

Answer 33

When sand level is below 20%

Question 34

When do the sand heaters turn on?

Answer 34

When the temperature falls below 5’ Celsius

Question 35

When are sanders non operational?

Answer 35

Below 5km/h

Question 36

Do the sanders operate during ED braking or powering?

Answer 36

No

Question 37

What will happen with Brake Cylinder pressure when MC is moved to B1, B2 or B3 if train is on a gradient?

Answer 37

It can roll as Brake Cylinder pressure will fall below Holding Pressure