Section | Guardian Technologies 4759, 4456, 4390, 4389, 4760, 4758

AC GENERATORS

PART 2

SECTION 2.3

TROUBLESHOOTING FLOWCHARTS

Page 2.3-3

Image 34

Guardian Technologies 4759, 4456, 4390, 4389, 4760, 4758 manual Section

Contents

Diagnostic Repair Manual Diagnostic Repair Manual Electrical Formulas Fuel Consumption EngineStator Winding Resistance Values / Rotor Resistance Mounting Dimensions Specifications Major Features Part General Information Item Number IntroductionSerial Number Selecting a Location Transfer Switch / Load CenterPrepackaged Transfer Switches Grounding the Generator Prepackaged Installation Basics Part Power Source and Load Lines System Control Interconnections General Fuel Requirements VOM Visual InspectionMeters Measuring AC Voltage Measuring Current Measuring AC FrequencyMeasuring Resistance Ampere Electrical UnitsOhms LAW Volt Megohmmeter Insulation ResistanceStator Insulation Resistance Test Testing ALL Stator Windings to Ground Test Between Windings Rotor Insulation Resistance Test Cleaning the GeneratorDrying the Generator Overspeed Shutdown High OIL Temperature ShutdownLOW OIL Pressure Shutdown Overcrank Shutdown Manual Position Control PanelOFF Position Auto position Manual Transfer to Standby Manual Startup SET Exercise SwitchTo Select Automatic Operation Protection Systems Manual Shutdown and Retransfer Back to Utility Automatic Operating Sequences SEQ. Condition Action SENSOR, Timer or Other Automatic Operating Parameters Part AC Generators AC Generator Rotor AssemblyENGINE-GENERATOR Drive System Other AC Generator Components Stator AssemblyBrush Holder and Brushes Excitation Circuit Breaker Voltage Regulator Main Line Circuit Breaker Field Boost Rotor Residual MagnetismField Boost Circuit Operation Troubleshooting Flowcharts Troubleshooting Flowcharts Part Section Section Test 1- Check Main Circuit Breaker SafetyProcedure Discussion Test 3- Test Excitation Circuit Breaker Test 2- Check AC Output VoltageIf a high voltage is indicated, go on to Test Test 4- Fixed Excitation Test Rotor AMP Draw Test Set VOM to AC volts Test 5 Wire Continuity Test 6 Check Field Boost Test 7 Testing the Stator with a VOM Test 8 Resistance Check Rotor Circuit Set VOM to the Rx1 scale Test 9 Check Brushes Slip Rings Remove wire 4 from the voltage regulatorIf continuity was measured in steps 5 and 6 proceed to step Test 11 Check AC Output Frequency Test 10 Test Rotor AssemblyTest 12 Check and Adjust Engine Governor Start the engine, let it stabilize and warm up at no-load Procedure 7KW Units Loosen the governor clamp bolt Figure Test 14 Check Voltage Frequency Under Load Test 13 Check and Adjust Voltage RegulatorTest 15 Check for Overload Condition Test 16 Check Engine Condition Part Type Prepackaged Transfer Switches Enclosure Utility Closing Coil C1 Limit Switches XA1 and XB1Transfer Mechanism Standby Closing Coil C2 Manual Transfer Handle Transfer RelayNeutral LUG Terminal Block Terminals 23 Fuse HolderUtility 1 Fuses F1, F2 Wiring Diagram and Schematic Operational Analysis Utility Source Power Available Utility Source Voltage Available Generator Power Available, Waiting to Transfer Utility Source Voltage Failure Transfer to Standby Transfer Action to Standby Position Generator Powering Load Utility Restored Utility Restored, Generator Still Providing Output to Load Utility RESTORED, Transfer Switch DE-ENERGIZED Utility Restored, Transfer Relay De-energized Utility RESTORED, Retransfer Back to Utility Transfer Switch in Utility Transfer Switch in Utility Introduction to Troubleshooting Troubleshooting Flow Charts Part Test 21- Check Voltage AT Terminal Lugs E1, E2 If the generator has been shut down, proceed as follows Test 22 Check Voltage AT Standby Closing Coil C2 Now, connect the VOM test leads across Relay Terminals 1 Test 24- Check Manual Transfer Switch OperationTest 23 Test Transfer Relay TR Continuity Results Test 25- Test Limit Switch XB1 PROCEDURE/RESULTS WIRING/CONNECTIONSTest 27- Check Voltage AT Terminal Lugs N1, N2 Utility 2 Terminals Test 29- Check Voltage AT Utility Closing Coil C1 Test 31 Test Limit Switch XA1 Test 30 Check Fuses F1 and F2 Set the AUTO-OFF-MANUAL switch to the OFF position Test 33 Continuity Test of Wiring C2Test 34 Check N1 and N2 Wiring See Test 32, Step Test 35 Check Transformer TX Transformer TX Part DC Control Circuit Board Terminal Strip / InterconnectionTransformer TX Utility 1 and Utility Description and Components AUTO-OFF-MANUAL Switch AMP Fuse Control Panel Component Identification Circuit Condition Utility Source Voltage Available Operational Analysis Initial Dropout Utility Source Voltage Circuit Condition Initial Dropout of Utility Source Voltage Section Utility Voltage Dropout Engine Cranking Section Engine Startup and Running Circuit Condition Engine Startup and Running Section Initial Transfer to Standby Source Section Utility Voltage Restored / RE Transfer to Utility Circuit Condition Utility Voltage Restored Section Engine Shutdown Circuit Condition Retransfer to Utility and Engine Shutdown Operational Analysis Troubleshooting Flow Charts Part Troubleshooting Flow Charts Section Section Section Section Section Test 43- Test AUTO-OFF-MANUAL Switch Test 41 Check Position of AUTO-OFF Manual SwitchTest 42 TRY a Manual Start Replace AUTO-OFF-MANUAL switch, if defective Set a VOM to measure DC voltage Test Battery State of Charge Test 46- Check BatteryInspect Battery Cables Test 45- Check 15 AMP Fuse If battery voltage is not indicated in , go to Test Test 47 Check Wire 56 VoltageTest Battery Condition Test 48- Test Starter Contactor Relay V-TWIN only Test 49- Test Starter Contactor Starter Contactor Relay Conditions Affecting Starter Motor Performance Test 50- Test Starter MotorShorted, open or grounded armature Checking the Pinion Measuring Current TachometerTools for Starter Performance Test Test Bracket Testing Starter Motor Remove Starter Motor Testing Starter Motor Performance Test 51 Check Fuel Supply Pressure Set the AUTO-OFF-MANUAL switch to OFF Test 53 Check Circuit Board Wire OutputDisconnect Wire 14 at the Fuel Solenoid FS Test 52 Test Fuel Solenoid Test 54 Check Fuel Solenoid Test 55 Check for Ignition Spark Test 57- Check Engine Compression Test 56 Check Spark PlugsIf sparking occurs but engine still wont start, go to Test Test 59 Check and Adjust Ignition Magnetos Test 58 Check Shutdown WireIf ignition spark still has not occurred, proceed to Test Setting Ignition Magneto Armature Air Gap With oil level correct, try starting the engine Test 60- Check OIL Pressure Switch WireCheck engine crankcase oil level Do the following Replace switch if it fails the test Test 61- Check High OIL Temperature SwitchSwitch terminals Remove the High Oil Temperature Switch Procedure Intake and Exhaust Test 62 Check and Adjust ValvesTest 63 Check Fuel Regulator Test 64 Check Battery Charge Output Set a VOM to measure AC voltage Test 66 Check AC Voltage AT Battery ChargerTest 65 Check Transformer TX Voltage Output If voltage was not measured in , go to Test Test 68 Check Battery Charge Winding Harness BCR Test 70 Check Engine RUN Winding Test 69 Check Battery Charger WiringSet VOM to measure frequency 63 HZ should be measured Test 71 Check N1 and N2 Voltage Test 73 Test SET Exercise SwitchAT the Circuit Board Test 75 Check Battery Voltage Circuit Test 74 Check Remote Start Wiring If EquippedTest 76 Check Cranking and Running Circuits Test 77 Test Exercise Function Continuity Part Operational Tests Type Transfer Switches Manual Transfer Switch OperationElectrical Checks Generator Tests Under Load Verify that the AUTO-OFF-MANUAL switch is set to Auto Setting the Exercise TimerChecking Automatic Operation Part Disassembly Remove door Major DisassemblySTATOR/ROTOR/ENGINE Removal Major Disassembly Follow Stator/Rotor/Engine removal procedures, Steps Front Engine AccessReverse the previous steps to re-assemble Part Electrical Data Model Part SCHEMATIC, 7 KW Home Standby Model 4456-0 Part SCHEMATIC, 12 & 15 KW Home Standby Drawing #0D9013-C 1 Part Wiring DIAGRAM, 7 KW Home Standby Drawing #0D9014-B 1 Drawing #0D9014-B 2 Model 4456-1 Part Wiring DIAGRAM, 12 & 15 KW Home Standby Drawing #0D8501-B 1 Drawing #0D8501-B 2 Part Electrical Data Part Page Page Xxxxxxxxxxxxxxxxxxxxxxxxxxx Xxxxxxxxxxxxxxxxxxxxxxxxxxx Part Procedure Section