apu loco.pdf

8/10/2019 apu loco.pdf

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Medha Servo Drives Pvt. Ltd.2-3-2/A, Cherlapally, Hyderabad 500051. India. Ph- 040-2726 4144

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Medha Servo Drives Pvt. Ltd.2-3-2/A, Cherlapally, Hyderabad 500051. India. Ph- 040-2726 4144

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Welcome to All

MedhaAuxiliary P ower Unit

Type MAP 756


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Locomotive Idling

Most of the goods trains are waiting for long periods

in station yards.Indian Railway statistics says almost 40% of thetotal run time of a diesel locomotive is IDLE only.Lot of fuel is wasted when the locomotive is waitingfor long periods in the station yards especiallygoods trains.Loco pilot can shut down the diesel engine to save

fuel.


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Why not shutdown

The Loco pilots can switch off the diesel engine and

save fuel instead of running at IDLE.But they dont do because:

BP pressure reduces in the formation due toleakages.

It takes longer time to charge the BP again.

The crew does not have confidence that loco canre-crank.


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What is wasted ?

The fuel consumed per hour on ALCO locomotives isaround 25 liters / Hour.If you take Rs.56/- per liter, the cost per idle hourrunning is Rs. 1400/-.If you take an average 10 hours per day idling hoursthen the cost is Rs.14,000/-.Roughly if you take 330 days, it costsRs.46,20,000/-.If a home shed is having 100 locos, almostRs. 46.2 c rores worth of fuel is wasted.


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What can be

saved by crew

Normally the Loco pilot is on duty for 8 hours per

day.Out of that minimum 6 hours he is in locomotive.Out of 6 hours minimum one hour is the waitingperiod.

In one Hour we can save 23 liters of fuel oil perday.On an average in a month the working days arearound 24 daysWe can save 24 * 23 = 552 liters per monthFinancially equivalent to 552 * 56 = Rs.30,912/-per month

On an average in a year we can save Rs.3,70,944/-.


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AESS with APU

APU SWITCH is provided underalarm push button.

Keep always this switch in NORMALposition to save fuel.If this switch is in OFF position,1701 Operator disabled APU message is displayed while the

breakers are switched ON.There after for every 10 minutesthe system reminds the driver witha message 2076 APU Enable switchis in OFF position. Warning: Cannotenter into fuel save mode.Keep this switch in OFF positiononly when there is a problem withAPU functionality.


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AESS with APU

APU is located in the nose

compartment under dynamicbrake grid resistors and afterthe air brake panel.This is an Add on unit toMicroprocessor based lococontrol system.It is called as AESS with APU.

It starts automatically andstops automatically as per thedrivers request.


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STATUTARY WARNINGS

Do not perform any jobs on main engine or APU

engine keeping APU SWITCH in NORMAL position.

Engine may automatically start / stop and cancause human injury / death.

Switch OFF APU Switch and then perform the workon engines.


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MAP 756

Diesel Engine

Engine Airintake filter

Compressor

Compressor Airinlet filters

Alternator

Control Unit


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Diesel Engine

Air Lockreleasing pump

STARTERmotor

STOPCylinder

Water levelsensor

Waterfilling cap

Expansiontank

Fuel oil

secondary filter


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MAP 756

12V Alternator

Gauge panel

12V Battery

APU KnifeSwitch

ManualShutdown


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Compressor

LP Cylinders

HP Cylinder

Breather Valve

Unloader Valves

Oil Fill Cap.

Oil sight glass


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Control Unit

MAP 756

Alternator

Regulator (AVR)

SMC

ASC ACC

FOLR

DiodePanelTimer Unit


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APU inside the Nose

compartmentThere is a glass door on theAPU.Behind the glass door, thereis a battery cut out switch.When the display prompts toopen this cut out switch,

Please open this switchmanually.There is an emergency stoplever to stop the APU enginein case of any problem.

When ever display promptsto manually shut down theAPU engine, Pull the levertoward you to shut down theAPU engine.


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AESS with APU working

Stop the train with A9.

Apply loco brakes andensure BCP is morethan 1.5 Kg/Cm.Keep the RH in neutralposition.After every parameteris with in limits for 10

minutes, the Display isshown with adecremental counter.


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After the counter is

zero, the systemautomatically starts theAPU.Main engine isshutdown.The display screen ischanged to APU screen.

All relevant parametersare displayed


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MCBG screen is change to starting screen.Small motors like DEM, CCEM, FPM and RBM areswitched OFF.DEB (Eng), DEB (Carb) indications start glowing.Aux.Fail indication glows but battery ammeter willbe showing charging side.

Note: Do not worry about these indications.


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Warnings

While APU is running if

Battery ammeter is showing discharge side (or)MR is continuously dropping and reached below5.5 Kg/Cm.The APU is automatically stopped and main engine

is cranked automatically.

Note: If APU is continuing to run in spite of the above,manually shut down the APU and crank the mainengine.


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How to start the train

As soon as the signal is in favour,Simply through the RH to working direction.2077 System returning from FUEL SAVE mode message isdisplayed.Small motors are switched ON.With in 15 seconds the main engine is crankedautomatically.APU engine is shut down.Display returns to normal screen.

Loco pilot can start the train as per rail road rulesand regulations.


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Code Message

1700 Operator enabled APU1701 Operator disabled APU

1277 APU cranking contactor circuit open fault.

1278 APU Cranking contactor stuck closed.

1287 APU shut down contactor circuit open fault

1284 APU shut down contactor stuck closed fault

1286 SMC contactor circuit open fault

1285 SMC contactor stuck closed1293 FPC contactor circuit open

1292 FPC contactor stuck closed

Trouble shooting


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Trouble shooting

Code Message

1279 APU fuel oil level low fault1280 APU water level low / Temperature High fault

1281 APU lube oil pressure low fault

1290 APU Engine failed Engine RPM low

1291 APU Engine failed Engine over speed

1276 APU Engine shut down unexpectedly.

1282 APU battery charging faulty

1283 APU Air compressor faulty1289 No APU Generator output

1288 Main Engine failed to crank while retrurning from APU mode.


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Trouble shooting

Code Message2075 Keep REV handle to neutral to enter into FUEL SAVE mode.

2076 APU Enable switch is in OFF position

2077 System returning from FUEL SAVE mode

2078 APU shutdown contactor failed. Manually pull the emergencyshut down lever to shutdown APU Engine.

2079 Loco brakes are not applied. May not enter into FUEL SAVEmode

2606 BATI/EWT/EOT/MRPR are not full filled. Fuel save modeprohibited.


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AESS with APU

Questions Please...?


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Training Team

THANK YOU

apu loco.pdf

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