mcbg drivers presentation.ppt

8/14/2019 MCBG Drivers Presentation.ppt

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MICRO CONTROLLER BASED GOVERNOR (MCBG)

TYPE MEG 601

Medha Servo Drives (P) LtdHyderabad.

Andhra Pradesh, India.



Working Principle of Governor

Engine

RPM

Governor

Notchposition

The Governor should

maintain constant

Engine RPM as per

Notch signal

irrespective of load.

So Engine RPM signal

is taken to Governor for

reference.




Fuel Rack

GovernorEngine

RPM

Notchposition

To maintain constant

engine RPM, Governor

adjusts the fuel rack

position.




Fuel Rack

GovernorEngine

RPM

Notchposition

Boost AirPressure

The amount of rack that

can be advanced is

limited by the BAP. So

BAP signal is also

connected to Goveror.




Lube oilPressure

Fuel Rack

GovernorEngine

RPM

Notchposition

Boost AirPressure

Governor has to shut

down the engine if

sufficient lube oil

pressure is not available

at that notch. So lube oil pressure signal is also

connected to Governor.




E type excitationinterfacing

Lube oilPressure

Fuel Rack

GovernorEngine

RPM

Notchposition

Boost AirPressure

When ever engine is

overloaded Governor

generates an output

signal proportional to

the amount ofoverloading to

maintain constant

Engine RPM. This

signal is interfaced

with excitation system

to reduce the load.



CONTROL UNIT



ACTUATOR UNIT



Installation of Control Unit inDriver’s CAB SH side in a

WDM series Locomotive

MICROCONTROLLER BASED

GOVERNOR (MCBG) INSTALLATION



Installation of Actuator Unit on

a Woodward Governor base

in a WDM series Locomotive

MICROCONTROLLER BASED

GOVERNOR (MCBG) INSTALLATION



Advanced Features



Advantages over conventionalgovernors

No need to check oil level sincethe governor is fully solid state.

Cranking time is less ascompared to Woodwardgovernor because the rack is

advanced before cranking. Battery life is increased.



Display Parameters

Displays variousDiesel Engineparameters like Engine RPM

Notch

Load ControlPosition (LCP)

Fuel Rack Position

Booster AirPressure

Lube Oil Pressure

Fuel Oil Pressure



Fault Diagnosis

On line FaultDisplayMessages with

Hooter Sounding Error Log with

Real Time andDate stamp in

Non VolatileMemory andDown Loadingthru LAPTOP/PC



Test Facilities

Facility to testelectronic andmechanical OST

through key lockswitch

Dry run test

Notch wisediesel enginerun time counter



Faults can be cleared by Driver

Faults Driver AttentionLoco cranking

but notstarting/firing.

1. MCBG is not powered ON.

2. MU switch in STOP position.

3. 'Press Start Button to CrankEngine' message is not on MCBG

screen.4. 'Lube oil sensor faulty, waiting for

recovery' message is on MCBGscreen.

5. LWS is operated.

6. OSTA tripped and not reset

properly.

7. Fuel Racks do not travel even ifGovernor shaft moves. (Overtravel spring in the base is windup)

8. If Fuel racks is not moving presslinkage to crank the engine.



Faults can be cleared by Driver

Faults Driver Attention

BAP less and poor haulingpower.

Switch on the Boost aircontrol switch in BAP Bypassmode provided on the frontpanel of the control unit.

Erratic engine rpm. Check the Notch inputconnections at Governorterminal block.

Check the connectortightness.

BAP/LOP/FOP/FRP sensorfaulty message on MCBGDisplay.

Check the connectorstightness at MCBG Controlunit & Actuator unit.



DRIVERS INSTRUCTION

When Engine got shutting down due to any reason:

Note down the fault message and record inrepair book.

Press acknowledge push button available on

front panel of control unit to clear the faultmessages.

Ensure the following message appears onDisplay before pressing start button.

“Press Start Button to Crank Engine”

0r “Engine Shut Down. Press, START Button to Crank

Engine”

Then crank the Loco.



DRIVERS INSTRUCTION

In case of LOP sensor faulty loco willnot crank.

BAP,FOP & FRP sensor failure locowill crank normally.

A message will be display aftermechanical OSTA trip “Move fuel racklinkage manually to free them.

mcbg drivers presentation.ppt

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