Manuals / Generac Power Systems / Lawn and Garden / Portable Generator

Generac Power Systems 9 kW NG, 10 kW LP, 13 kW NG, 7 kW NG, 8 kW LP, 17 kW LP, 20 kW LP, 16 kW NG N2A

Models: 18 kW NG 14 kW LP 16 kW NG 20 kW LP 17 kW LP 8 kW LP 9 kW NG 7 kW NG 13 kW NG 10 kW LP

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Page 83

Transfer switch

Part 3

Section 3.4

Diagnostic tests

A

B

N2A

N1 N2

E1 E2

T1 T2

A H

N2A C

SW2	SW3	B
2		2
C1		C2
1		1
I	SW1
G

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TR1

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	A	F3	B
D	A	F2	B
	A	F1	B

Figure 7. Utility Control Circuit Test Points

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Generac Power Systems 9 kW NG, 10 kW LP, 13 kW NG, 7 kW NG, 8 kW LP, 17 kW LP, 20 kW LP, 16 kW NG, 14 kW LP, 18 kW NG manual N2A

Contents

Air-Cooled Product Electrical formulas Automatic Operating Sequences Problem 12 No Battery Charge 147 Specifications Fuel Consumption EngineMounting Dimensions Right Side View Door removed Major FeaturesPart General Information Rainproof Enclosure Fitted Rated Ambient Temp 40C Generator Identification PartIntroduction Neutral FloatingGrounding The Generator Installation basicsTransfer Switch / Load Center Selecting a LocationTypical Installation Installation basics PartNatural Gas Fuel Interconnections Power Source And Load Lines System Control InterconnectionsNon-Prepackaged Interconnections Part Control Wires from Transfer SwitchPRE 08 HSB AIR-COOLED Generators Single & V-TWIN Engines Non-Prepackaged InterconnectionsFuel Requirements Reconfiguring The Fuel SystemPreparation Before Use Part GeneralPreparation before use Install the battery, door and close the roofEngine Oil Recommendations Measuring DC Voltage MetersVom Measuring AC VoltageMeasuring Resistance Testing, cleaning and drying PartMeasuring Current Volts Amps Ohms Electrical UnitsOhm’s Law ONE 1 Second Visual InspectionInsulation Resistance MegohmmeterStator Insulation Resistance Test 10 kW Repeat between Wire 2 and Stator LeadStator Insulation Resistance Test 12-20 kW Drying The Generator Cleaning The GeneratorRotor Insulation Resistance Test 10 kW Rotor Insulation Resistance Test 12-20 kWOverspeed Shutdown Low BatteryHigh Temperature Switch Low Oil Pressure ShutdownOvercrank Shutdown Engine-generator protective devices PartControl Panel Operating InstructionsManual Transfer To Standby Manual Startup KW Installation AssistantOperating instructions Part To Select Automatic OperationSeconds then re-crank if additional crank cycles exist Automatic operating parametersExercise Automatic operating parameters PartManual AutoPart AC Generators AC Generator Rotor AssemblyEngine-Generator Drive System Description & components Stator AssemblyMain Line Circuit Breaker Description & components PartBrush Holder And Brushes 12-20 kW Other AC Generator ComponentsField Boost 12-20 KW Rotor Residual MagnetismStartup Operational analysis PartOperation 8/10 kW Operation 12-20 kWTroubleshooting flowcharts Troubleshooting flowcharts Part Problem 4 Generator Produces High Voltage at No-Load Troubleshooting flowchartsProblem 3 Generator Produces Low Voltage at No-Load Units with Results SafetyTest 1 Check Main Circuit Breaker Test 2 Check AC Output VoltageTest 4 Fixed Excitation Test Rotor Amp Draw Test Diagnostic tests PartRemove jumper lead connected to Wire 4 and Wire 15B ProcedureExample Test 5 Wire Continuity 12-20 kWDiagnostic tests Test 6 Check Field Boost 12-20 kW Test 7 Testing The Stator With a Vom 12-20 kWReconnect Wire Test 8 Test Brushless Stator Repeat using stator lead WireTest Control Panel Wires for Continuity Test 9 Check Capacitor Repeat using stator leadRepeat using Wire Measured Meter lead to WireRepeat using Wires 2 Test 10 Test DPE Winding on Brushless unitsIf Continuity was measured in Steps 5 and 6 proceed to Step Remove Wire 4 from the voltage regulatorTest 11 Resistance Check Rotor Circuit 12-20 kW Test 12 Check Brushes And Slip Rings 12-20 kWTest 14 Check AC Output Frequency Test 13 Test Rotor Assembly 12-20 kWLoosen the governor clamp bolt Figure Remove air cleaner cover to access stepper motorTest 16 Check Stepper Motor Control V-twin Engine Units Pull ARM this Direction to Close Throttle Test 17 Check And Adjust Voltage Regulator 12-20 kWTest 21 Field Flash Alternator KW Units Refer back to flow chartTest 18 Check Voltage Frequency Under Load Test 20 Check Engine ConditionConstruction of Energizing Cord Page Transfer Item Description General EnclosureTransfer Relay Transfer MechanismUtility N1 and N2 Neutral LugManual Transfer Handle Terminal BlockFuses F3 Fuse HolderFuses F1, F2 Operational Analysis Is a schematic for a typical W/V-Type transfer switchOperational analysis Is a wiring diagram for a typical W/V-Type transfer switchSW1 Utility Source Voltage AvailableUtility Source Voltage Failure Generator Power Available, Waiting to TransferTransfer Action to Standby Position Transfer To StandbyGenerator Powering Load Utility Restored, Generator Still Providing Output to Load Utility RestoredUtility Restored, Transfer Relay De-energized Utility Restored, Transfer Switch De-energizedUtility Restored, Retransfer Back to Utility Utility Restored, Retransfer Back To UtilityTransfer Switch in Utility Transfer Switch In UtilityProblem 7 In Automatic Mode, No Transfer to Standby Troubleshooting flow charts PartIntroduction To Troubleshooting Problem 9 Blown F1 or F2 Fuse Troubleshooting flow chartsCheck N1 & N2 Problem 14 No Battery Charge Load Shed Transfer Switch Problem 11 No Battery Charge Pre-Wire Load CenterProblem 12 No Battery Charge Rtsn & Rtse Transfer Switch Problem 13 No Battery Charge GenReady Load CenterIf the generator has been shut down, proceed as follows Test 26 Check Voltage at Terminal Lugs E1, E2Manual Transfer Switch Operation Test 27 Check Manual Transfer Switch OperationPROCEDURE/ Results Test 28 Check 23 and 15B WiringReconnect the J2 connector to the PCB Set VOM to measure DC voltage Remove the J2 connector from the circuit boardTest 29 Test Transfer Relay Tr Test 30 Standby Control Circuit Test 31 Check WireSW1 Test 32 Utility Control Circuit OutputN2A Test 34 Check Fuses F1 and F2 Test 33 Test Limit Switch SW2 and SW3Replace blown fuses as needed Test 35 Check N1 and N2 WiringTest 36 Check N1 and N2 Voltage Test 39 Check Voltage at Terminal Lugs N1, N2 Test 37 Check Utility Sensing Voltage at the Circuit BoardTest 38 Check Utility Sense Voltage Generator Transfer SwitchMeasure across points M and N VDC should be measured Test 40 Check Battery ChargerTest 42 Check Wire 0 and Wire15B Pre-wire load center Measure across points a and C VAC should be measuredMeasure across points E and F VAC should be measured Rtsn & Rtse Transfer SwitchTest 45 Check Wire 0/15B Rtsn & Rtse Transfer Switch 15B Test 43, 44, and 45 Rtse Transfer Switch Test Points Disconnect the J2 connector from the printed circuit board Test 48 Check Wire 0/15B GenReady Load CenterSection Measure across points E and D VAC should be measured Load Shed Transfer SwitchMeasure across points C and D VAC should be measured LSC LSSATS Test 51 Check Wire 0 and Wire 15B Load Shed Transfer Switch Part DC Control Circuit Board Auto-Off-Manual SwitchDescription and components Part Terminal Strip / InterconnectionAmp Fuse Description and componentsKW Printed Circuit Boards and J1 Connector Harness END Remote Wireless Connection J2 Connector PCB END J1 Connector Stepper MotorPCB END Harness END Harness END Remote Wireless Connection N1/N2 Connector17 and 20 kW Printed Circuit Board and J1 Connector Menu System Navigation Choke Solenoid Connector Pin Number IdentificationComponents DescriptionStator Circuit Condition Utility Source Voltage Available Initial Dropout of Utility Source Voltage Circuit Condition Initial Dropout of Utility Source Voltage Utility Voltage Dropout and Engine Cranking Circuit Condition Engine Cranking Engine Startup and Running Circuit Condition Engine Startup and Running Initial Transfer to the Standby Source Circuit Condition Initial Transfer to Standby Utility Voltage Restored / Re-transfer to Utility Circuit Condition Utility Voltage Restored Engine Shutdown Circuit Condition Retransfer to Utility and Engine Shutdown Controller Switch BAD Replace Controller Assembly Problem 17 Engine Cranks but Won’t Start Readjust Replace Choke Solenoid BAD Problem 19 Shutdown Alarm/Fault Occured Problem 22 No Low Speed Exercise Problem 20 7.5 Amp Fuse F1 BlownProblem 21 Generator Will Not Exercise Test 57 Try a Manual Start Test 56 Check Position Of Auto-Off Manual SwitchTest 58 Auto-Off-Manual Switch Twin Only Test 60 Check 7.5 Amp Fuse Test 61 Check BatteryTest 59 Test Auto Operations Typical Battery Load Tester Test Battery ConditionSet a VOM to measure DC voltage Test 62 Check Wire 56 VoltageIf battery voltage is indicated in refer back to flow chart Test 63 Test Starter Contactor Relay V-twin OnlyTest 64 Test Starter Contactor Single Cylinder Engine Reconnect Wire 13 to the SCRPinion Test 65 Test Starter MotorShorted, open or grounded armature Checking the PinionTools for Starter Performance Test PinionSolenoid Removed Test 66 Check Fuel Supply PressurePort 12-20 kW Gas Pressure Test point Test 67 Check Circuit Board Wire OutputTest 69 Check Choke Solenoid Disconnect the C3 ConnectorTest 68 Check Fuel Solenoid Solenoid De-Energized, Choke Closed KW Units Approximately 3.7 ohms should be measuredTest 70 Check for Ignition Spark Disconnect the C3 Connector Set a VOM to measure DC voltageDisconnect C3 Connector Set a VOM to measure resistance KW Choke Solenoid Test 71 Check Spark Plugs Check Compression Test 73 Check Shutdown WireRemove a spark plug Repeat Steps 1 through 8 on remaining cylinderDepending on engine type, do the following Test 74 Check and Adjust Ignition MagnetosMagneto Setting Ignition Magneto Armature Air GapCylinder One Back, Short With oil level correct, try starting the engine Test 75 Check Oil Pressure Switch WireNavigate to the Digital inputs display screen Check engine crankcase oil levelRemove the High Oil Temperature Switch Test 76 Check High Oil Temperature SwitchTest 77 Check and Adjust Valves Replace switch if it fails the testBall Stud JAM NUT Test 78 Check Wire 18 ContinuitySet the AUTO-OFF-MANUAL switch to the Manual position Record the current date and time of the unit Test 79 Test Exercise FunctionTest 80 Check Cranking and Running Circuits 8kW Choke SolenoidIf the solenoid closed, replace the controller Test 81 Check to see if Low Speed Function is enabledDisconnect Wire 4 and Wire 0 from the Voltage Regulator VR Test 82 Check operation Choke SolenoidPart Operational Tests Set the generator main line circuit breaker to OFF or open Manual Transfer Switch OperationSystem functional tests Part Electrical ChecksGenerator Tests Under Load System functional testsChecking Automatic Operation Setting The Exercise TimerVerify that the AUTO-OFF-MANUAL switch is set to Auto Part Disassembly Remove control harnesses Major Disassembly PartFront Engine Access Major Disassembly Section Section Major Disassembly Section Section Section Section Engine mount nuts with ground wires. See Figure Torque Requirements Unless Otherwise Specified Part Electrical Data Drawing #0G7945 Wiring Diagram, 8 kW Home Standby PartWiring Diagram, 8 kW Home Standby Drawing #0G8511 Schematic, 8 kW Home Standby PartPart Schematic, 8 kW Home Standby Drawing #0G7946 Wiring Diagram, 10 kW Home Standby PartPart Wiring Diagram, 10 kW Home Standby Drawing #0G8512 Schematic, 10 kW Home Standby PartPart Schematic, 10 kW Home Standby Drawing #0G7947 Wiring Diagram, 14 kW Home Standby PartPart Wiring Diagram, 14 kW Home Standby Drawing #0G8513 Schematic, 14 kW Home Standby PartPart Schematic, 14 kW Home Standby Drawing #0G7948 Wiring Diagram, 17 kW Home Standby PartPart Wiring Diagram, 17 kW Home Standby Drawing #0G8514 Schematic, 17 kW Home Standby PartPart Schematic, 17 kW Home Standby Drawing #0G8186 Wiring Diagram, 20 kW Home Standby PartPart Wiring Diagram, 20 kW Home Standby Drawing #0G8515 Schematic, 20 kW Home Standby PartPart Schematic, 20 kW Home Standby Wiring Diagram, Home Standby Transfer Switch, 9/10/12/16 circuitPart Wiring Diagram, Home Standby Drawing #0G7959 Schematic, Home StandbyPage Page Page MyGenerac.com