HCMT Underframe Flashcards
Where are the Surge reservoirs?
2 at each end of Every Car
What do Surge Reservoir do?
Supplies compressed air to the airbag suspension at each bogie
What do the brake supply reservoirs do?
Supplies compressed air to the electro pneumatic valves to charge the brake cylinders
There is one on every car at no.1 end
What are the two different types of bogies used on HCMT trains?
Motor bogie on motor cars
Trailer bogie on trailer cars
The TC and DT cars are fitted with two trailer bogies each
All other cars are fitted with two motor bogies each motor bogies are fitted with traction motors on each axle
What are some of the other features on the bogies?
• Speed sensors
• Tread scrubber TC, car only
• One park brake per axle ( DMp, Mp and DT)
• Park brake, manual releases (as above)
• Primary and secondary suspension
What is a tread scrubber?
Similar to a brake block, it also has an isolation cock
What does the primary suspension consist of?
Rubber laminated springs serve as mechanical shock absorbers
How is the air suspension isolated?
You must isolated both bogies
Each cock isolates the surge reservoirs for one bogie
Do drivers test the sanders?
No the TMS system will test them automatically
Where are the Park Brakes located?
One per axle except for Tc cars
What type of coupling can be formed with the HCMT semi-permanent couplers?
Mechanical & Pneumatic for emergency towing
Non electric
How do we open the coupler cover?
• Unlock the locking mechanism
• WITH ASSISTANCE, raise the cover under control
• Utilise the 2nd locking mechanism
How many people must raise the cover?
Minimum 2 as per rules
Which Iso cock in the Brake Control module is the only one in the Tc car
Tread Scrubber
Where is the brake control unit located?
Inside the brake control module of every car
What equipment is part of the Auxiliary Power Supply system (SIV) and where is the equipment located?
• Auxiliary Inverter
• Medium Voltage Box
• Battery Charger
Located on on Trailer Cars (DT Tc)
How long do the batteries provide emergency power to the train for when the traction power supply OR the battery charging system has failed?
A minimum of two hours
(They provide sufficient battery power to enable normal operation, even after the train has stable for two weeks)
What does the air supply unit (ASU), consist of?
Also known as a compressor, the air supply unit, (ASU) comprises of
• Main Air compressor,
• air dryers
• filters
Where is the ASU (Air supply unit) located?
On all Tc cars
What is the purpose of the air supply unit?
To maintain main reservoir pressure within the operating range
What is the shore equipment for And where is it located?
Used by downer to electrically, and or pneumatically supply the train when it is undergoing maintenance in the workshop
(Its like a power point or a spot where they plug into the train so they can work on it without actually turning on or starting up the train)
Does the trip automatically lower and set when the driver turns the master controller key switch to on?
Yes
Where is the park Brake isolating cock located?
Inside the brake control module on Every car except the TC cars.
(The Tc Cars have the tread scrubbers instead)
Where is the high-voltage box? And what does it consist of?
Oh, HV high-voltage box consists of
• high Speed circuit, breaker,
• harmonic, wave detection device,
and it is located on All motorcars
What powers the high-voltage box?
The pantagraph
- to supply the traction and auxiliary power supply systems
What is the variable voltage and variable frequency cabinet?
It’s basically a traction control unit and it comprises of:
• 2 traction inverter modules, (one per bogie)
• traction control unit (TCU)
What do the two Traction inverter modules do?
They convert 1500 V DC to three phase variable Voltage and variable frequency for powering the traction motors
Where are the variable voltage and variable frequency cabinets located?
In the center of the motorcars
What do Brake Resistor Grids do?
Brake resistors, absorb the energy generated by the traction motors during ED breaking and dissipate it as heat
How do we isolate the pantograph on. DMp car?
On a DMP car, we need to use the internal isolating cock that’s in the saloon area. (Between the Aux Compressor & the Panto)
- If we use the Panto iso cock that is on the underframe, it won’t isolate the panto because the auxiliary compressor will continue to keep the Panto raised.
How do you isolate the Pantos on an MP car?
Using the Panto isolating, cock That is located on the under frame. (There is no auxiliary compressor on an Mp car, so it will isolate it)
What is the purpose of the battery powered auxiliary compressor?
To provide air for the pantagraph when main reservoir pressure is low
When will the auxiliary compressor automatically raise the pantograph?
• When there is insufficient, main res pressure To raise the Panto
• When the car has been isolated from the MR system
What are the isolating cocks in the brake control Unit on an Mp, DT & DMp car?
And in a TC car?
From left to right :
• brake supply IC
• Brake cylinder IC’s 2
• BC IC 1
• PARK BRAKE IC (Tread scrubbers IC in the TC cars only)
• Sanding, equipment IC
What Does the brake control module contain?
It contains the brake Control unit and five isolating Cocks
What does the high-voltage box do?
It is powered by the panto to supply the traction and auxiliary power supply systems
What is inside a high-voltage box?
• High Speed circuit breaker.
• Harmonic wave detection device
What is inside the VVVF Cabinet?
• Two traction inverter modules.
• Traction control unit.
• One traction inverter module for each bogie
What is the purpose of the VVVF ?
They convert 1500 V DC to three phase variable voltage and variable frequency for powering the traction motors
On which Cars is the medium voltage box located?
Located on underframe of
MP, TC, DT
cars
Located within the auxiliary, power supply, container
What is the function of the medium voltage box?
To maintain the train lined medium voltage (415 V AC) that is produced by the auxiliary inverters
What does the auxiliary power supply container consist of and where is it located?
Located on the under frame of TC and DT cars. This unit consists of:
• Auxiliary inverter
• Medium voltage box
• Battery charger
Are drivers qualified to use the emergency evacuation ladder?
No
In the battery box,
How many Cells are in each battery set
And what supply of power?
A total of 80 cells provide 110 V DC
What happens if there is a failure of one battery set?
The other battery sets can supply is 110 V DC to the train line
How much emergency power do the batteries provide to the train when the traction power supply, or the battery charging system has failed?
Two hours minimum
