2.12 Troubleshooting Open-shelf diesel engine and quiet generating set
2.12.1General symptom and possible cause
The generator can not generate, generating set has no electricity or the
voltage is abnormal, the voltage is fluctuated when loaded.
Fault caused by electric machine.
1.
2.
3.
4.
5.
7.
8.
9.Open circuit of electric machine rotor winding coil.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.Insulation resistance of generator is decreased.
Check the wiring harness.
Check or replace terminal.
Remedy
Drain the fuel oil, check and clean.
Refill the fuel oil.
Turn it to START position.
Check.
Clean.
Switch on.
Clean.
Check, replace.
Check or replace.
Check, replace.
Check, replace.
Check, replace.
Check, replace battery or charge regulator.
Check or adjust lash.
Check or replace recoil part.
Check or replace starting motor.
Adjust or disassemble to clean
Check or replace.
Repair the fault.
Repair the fault
Adjust.
Fault
Deteriorated diesel oil in fuel oil.
Fuel oil is not sufficient
Fuel cock is not at START position
Diesel oil filter is clogged
The pump does not delivery oil
Oil nozzle is clogged
Engine cylinder has a seize fault.
Oil pump or nozzle is faulty.
Engine governor spring is faulty.
Valve lash is adjusted improperly.
Oil delivery pipe of oil tank is bent or oil pipe is clogged
Fuel injection pump and nozzle do not delivery oil
The governor lever of engine throttle is not at START position.
Engine oil filter is clogged causing low oil protection
Solenoid fuel valve is clogged or does not work because power off .
The governor lever of engine throttle is faulty
The contact of starting switch fails to function
Electromagnetic coil in starting motor is faulty
The starting motor has internal mechanical fault
Oil level switch (engine oil alerting apparatus) is faulty
The battery has no electricity, charge circuit is faulty
Valve lash is improperly adjusted or valve pad falls off
Driving gear for starting motor is abrasive or cracked
Generator has a overload or short circuit fault
Remove the high pressure oil pipe, check for delivery of oil, replace pump or clean.
Remove the high pressure oil pipe, check for delivery of oil, replace pump or clean.
Check the 12V power supply or replace solenoid valve.
Check and observe the engine rotation, disassemble the engine to replace faulted part.
Check the wiring harness of 12V battery with gauge panel.
Recoil part in recoil starting set is faulty
Power supply for starting circuit is faulty
The oil supply for oil-line is not sufficient.
The diesel engine can not start or difficult to start
Check exhaust-gas or observe engine rotation,
clean or replace oil nozzle.
Engine speed is unstable,
too high or too low.
Gauge panel of
generating set
1. Air breaker fails to function
2.
3.
Check the wiring harness.
Check or replace receptacle.
The wiring of gauge panel is loosened.
The connection of receptacle is loosened or contact is melted.
Remove it and check for open circuit. The resistance reading in multimeter should be "0"
The lead-out of electric machine is loosened.
The four-port terminal of electric machine is cracked.
Open circuit of electric machine main winding coil
Short circuit of electric machine main winding coil.
Open circuit of electric machine secondary winding coil.
Open circuit of electric machine sampling winding coil.
Interturn short circuit of electric machine main winding coil.
Short circuit of electric machine rotor winding coil.
Loss of magnetism in electric machine rotor magnetic steel
Short circuit of electric machine rotor collector.
Fixed carbon-brush on electric machine stator is loosened or wear-out.
Rear end cover of electric machine stator is cracked.
Frictional short-circuit of electric machine stator and rotor.
Electric machine fault caused by wearing of engine output bearing.
Fan blade of electric machine is cracked.
High temperature overheating of electric machine stator or rotor.
Front end cover of electric machine is cracked.
Carbon-brush is sparking or wearing, or collector is darkening.
Check resistance value at terminal, reconnect or replace stator.
Check resistance value at terminal, reconnect or replace stator.
Check resistance value at secondary winding inserter, reconnect or replace stator.
Check resistance value at sampling winding inserter, reconnect or replace stator.
Check temperature of electric machine for overheating, check resistance value, or replace stator.
Check resistance value at collector, reconnect or replace rotor.
Check resistance value at collector, reconnect or replace rotor.
Check main winding for initial voltage when no AVR in electric machine.
Check resistance value at collector, reconnect or replace rotor.
Check resistance value at collector, reconnect or replace carbon-brush.
Check insulation resistance of stator and rotor by voltage withstanding gauge, or replace stator and rotor of electric machine.
Check resistance value at collector, reconnect or replace carbon-brush.
Check temperature of electric machine for overheating, check resistance value, or replace stator and rotor.
Check for abnormal sound or high temperature of electric machine, replace front end cover.
Check for abnormal sound or high temperature of electric machine, replace rotor.
Check for abnormal noise of engine or high temperature of electric machine at starting, replace engine.
Check temperature of electric machine for overheating, check resistance value, or replace stator and rotor.
Check for abnormal noise of electric machine at starting, check resistance value, replace front end cover.
Check output voltage or adjust AVR, check connecting harness
1.
2. Voltage excursion
3.
4. Electric component failed
5.
6.
7.
8.
9.
10. Incorrect wiring for exciting
Fault caused by automatic
voltage regulator AVR
Voltage can not be regulated, regulating potential meter is fault
Generator set automatically stopped after loading, current setting incorrect
After entering sampling signal no exciting output
The voltage can not be established because of insufficient residual voltage of electric machine
Power loss is increased because of higher voltage output of secondary winding
The voltage deviation of zero load and full load is too large , voltage regulating rate is low
The rising of voltage of generating set is high after capacitive load
Check output voltage or adjust AVR, or replace AVR
Correct wiring
Check loading, decrease load; check the voltage of AVR secondary winding, or replace AVR
Check AVR and the temperature of electric machine for high temperature, or replace electric machine or AVR
Check that the voltage of secondary winding should not above 140 V
Check that the voltage of main winding should be above 6 V without AVR in electric machine
Check exciting output voltage of AVR or adjust AVR, or replace AVR
Replace AVR
Check output voltage or adjust AVR, or replace AVR
Fault
Remedy:
Fault of intelligent
control panel
1. No display on screen.
2. Display wrong code.
3. Can not start.
Check 12V power supply of generating set
and check wiring for loosening or replace
display screen.
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