MICRO CONTROLLER BASED GOVERNORTYPE MEG 601 (MCBG) Medha Servo Drives (P) Ltd Hyderabad. Andhra Pradesh, India. What is a Governor ? A Device that maintains a steady speed in a Diesel engine from No Load to Full Load. Working Principle of Governor The Governor should maintain constant Engine RPM as per Notch signal irrespective of load. Notch position Engine RPM Governor So Engine RPM signal is taken to Governor for reference. Working Principle of Governor To maintain constant engine RPM, Governor adjusts the fuel rack position. Notch position Engine RPM Governor Fuel Rack Working Principle of Governor The amount of rack that can be advanced is limited by the BAP. So BAP signal is also connected to Goveror. Boost Air Pressure Notch position Engine RPM Governor Fuel Rack Working Principle of Governor 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. Boost Air Pressure Notch position Engine RPM Governor Fuel Rack Lube oil Pressure Working Principle of Governor When ever engine is overloaded Governor generates an output signal proportional to the amount Notchof overloading position to maintain constant EngineEngine RPM. This signal is interfaced RPM with excitation system to reduce the load. Boost Air Pressure E type excitation interfacing Fuel Rack Governor Lube oil Pressure CONTROL UNIT ACTUATOR UNIT MICROCONTROLLER BASED GOVERNOR (MCBG) INSTALLATION Installation of Control Unit in Driver’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 Advanced Features Advantages over conventional governors No need to check oil level since the governor is fully solid state. Cranking time is less as compared to Woodward governor because the rack is advanced before cranking. Battery life is increased. Display Parameters Displays various Diesel Engine parameters like Engine RPM Notch Load Control Position (LCP) Fuel Rack Position Booster Air Pressure Lube Oil Pressure Fuel Oil Pressure Fault Diagnosis On line Fault Display Messages with Hooter Sounding Error Log with Real Time and Date stamp in Non Volatile Memory and Down Loading thru LAPTOP/PC Test Facilities Facility to test electronic and mechanical OST through key lock switch Dry run test Notch wise diesel engine run time counter Faults can be cleared by Driver Faults Loco cranking but not starting/firing. 1. 2. 3. Driver Attention MCBG is not powered ON. MU switch in STOP position. 'Press Start Button to Crank Engine' message is not on MCBG screen. 'Lube oil sensor faulty, waiting for recovery' message is on MCBG screen. LWS is operated. OSTA tripped and not reset properly. Fuel Racks do not travel even if Governor shaft moves. (Over travel spring in the base is wind up) If Fuel racks is not moving press linkage to crank the engine. 4. 5. 6. 7. 8. Faults can be cleared by Driver Faults BAP less and poor hauling power. Driver Attention Switch on the Boost air control switch in BAP Bypass mode provided on the front panel of the control unit. Check the Notch input connections at Governor terminal block. Check the connector tightness. Erratic engine rpm. BAP/LOP/FOP/FRP sensor faulty message on MCBG Display. Check the connectors tightness at MCBG Control unit & Actuator unit. DRIVERS INSTRUCTION When Engine got shutting down due to any reason: Note down the fault message and record in repair book. Press acknowledge push button available on front panel of control unit to clear the fault messages. Ensure the following message appears on Display 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 will not crank. BAP,FOP & FRP sensor failure loco will crank normally. A message will be display after mechanical OSTA trip “Move fuel rack linkage manually to free them.