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

Generac Power Systems 14 kW LP, 10 kW LP, 13 kW NG, 7 kW NG, 9 kW NG, 8 kW LP manual Engine Shutdown

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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Section 4.2

Operational analysis

Part 4

DC control

Engine Shutdown

Following retransfer back to the utility source, an “engine cool-down timer” on the circuit board starts timing. When that timer has timed out (approximately one minute), circuit board action will de-energize the circuit board’s run relay. The following events will then occur:

•The DC circuit to Wire 14 and the fuel solenoids (FS1 & FS2) will be opened. The fuel solenoids will de- energize and close to terminate the engine fuel supply.

		POWER
		WINDING
		44
6	STATOR	22 33
2		11
		POWER

	WINDING
BA	0
	4

IM2	18
SP2

IM1	18
SP1

	2		2
	6		6
	0	0	0	VOLTAGE
	4	0	4	REGULATOR
	4	4	4	REGULATOR
	22	4	22
	22		22
	11		11

0 4

8586

HTO LOP

56

00

SCR

0

0

	13
	13		13
	13	13	BATTERY
		13	BATTERY
			12V
	SCR		0
			0
	16	SC

SM

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

Contents

Air-Cooled Product Electrical formulas Automatic Operating Sequences Problem 12 No Battery Charge 147 Specifications Engine Fuel ConsumptionMounting Dimensions Right Side View Major Features Door removedPart General Information Neutral Floating Generator Identification PartIntroduction Rainproof Enclosure Fitted Rated Ambient Temp 40CSelecting a Location Installation basicsTransfer Switch / Load Center Grounding The GeneratorInstallation basics Part Typical InstallationPower Source And Load Lines System Control Interconnections Natural Gas Fuel InterconnectionsControl Wires from Transfer Switch Non-Prepackaged Interconnections PartNon-Prepackaged Interconnections PRE 08 HSB AIR-COOLED Generators Single & V-TWIN EnginesGeneral Reconfiguring The Fuel SystemPreparation Before Use Part Fuel RequirementsInstall the battery, door and close the roof Preparation before useEngine Oil Recommendations Measuring AC Voltage MetersVom Measuring DC VoltageMeasuring Current Testing, cleaning and drying PartMeasuring Resistance Ohm’s Law Electrical UnitsVolts Amps Ohms Megohmmeter Visual InspectionInsulation Resistance ONE 1 SecondStator Insulation Resistance Test 12-20 kW Repeat between Wire 2 and Stator LeadStator Insulation Resistance Test 10 kW Rotor Insulation Resistance Test 12-20 kW Cleaning The GeneratorRotor Insulation Resistance Test 10 kW Drying The GeneratorLow Oil Pressure Shutdown Low BatteryHigh Temperature Switch Overspeed ShutdownEngine-generator protective devices Part Overcrank ShutdownOperating Instructions Control PanelTo Select Automatic Operation KW Installation AssistantOperating instructions Part Manual Transfer To Standby Manual StartupAutomatic operating parameters Seconds then re-crank if additional crank cycles existAuto Automatic operating parameters PartManual ExercisePart AC Generators Engine-Generator Drive System Rotor AssemblyAC Generator Stator Assembly Description & componentsOther AC Generator Components Description & components PartBrush Holder And Brushes 12-20 kW Main Line Circuit BreakerRotor Residual Magnetism Field Boost 12-20 KWOperation 12-20 kW Operational analysis PartOperation 8/10 kW StartupTroubleshooting flowcharts Troubleshooting flowcharts Part Problem 3 Generator Produces Low Voltage at No-Load Troubleshooting flowchartsProblem 4 Generator Produces High Voltage at No-Load Units with Test 2 Check AC Output Voltage SafetyTest 1 Check Main Circuit Breaker ResultsProcedure Diagnostic tests PartRemove jumper lead connected to Wire 4 and Wire 15B Test 4 Fixed Excitation Test Rotor Amp Draw TestDiagnostic tests Test 5 Wire Continuity 12-20 kWExample Reconnect Wire Test 7 Testing The Stator With a Vom 12-20 kWTest 6 Check Field Boost 12-20 kW Test Control Panel Wires for Continuity Repeat using stator lead WireTest 8 Test Brushless Stator Repeat using Wire Repeat using stator leadTest 9 Check Capacitor Test 10 Test DPE Winding on Brushless units Meter lead to WireRepeat using Wires 2 MeasuredTest 12 Check Brushes And Slip Rings 12-20 kW Remove Wire 4 from the voltage regulatorTest 11 Resistance Check Rotor Circuit 12-20 kW If Continuity was measured in Steps 5 and 6 proceed to StepTest 13 Test Rotor Assembly 12-20 kW Test 14 Check AC Output FrequencyTest 16 Check Stepper Motor Control V-twin Engine Units Remove air cleaner cover to access stepper motorLoosen the governor clamp bolt Figure Test 17 Check And Adjust Voltage Regulator 12-20 kW Pull ARM this Direction to Close ThrottleTest 20 Check Engine Condition Refer back to flow chartTest 18 Check Voltage Frequency Under Load Test 21 Field Flash Alternator KW UnitsConstruction of Energizing Cord Page Transfer General Enclosure Item DescriptionTransfer Mechanism Transfer RelayTerminal Block Neutral LugManual Transfer Handle Utility N1 and N2Fuses F1, F2 Fuse HolderFuses F3 Is a schematic for a typical W/V-Type transfer switch Operational AnalysisIs a wiring diagram for a typical W/V-Type transfer switch Operational analysisUtility Source Voltage Available SW1Generator Power Available, Waiting to Transfer Utility Source Voltage FailureTransfer To Standby Transfer Action to Standby PositionGenerator Powering Load Utility Restored Utility Restored, Generator Still Providing Output to LoadUtility Restored, Transfer Switch De-energized Utility Restored, Transfer Relay De-energizedUtility Restored, Retransfer Back To Utility Utility Restored, Retransfer Back to UtilityTransfer Switch In Utility Transfer Switch in UtilityIntroduction To Troubleshooting Troubleshooting flow charts PartProblem 7 In Automatic Mode, No Transfer to Standby Troubleshooting flow charts Problem 9 Blown F1 or F2 FuseCheck N1 & N2 Problem 13 No Battery Charge GenReady Load Center Problem 11 No Battery Charge Pre-Wire Load CenterProblem 12 No Battery Charge Rtsn & Rtse Transfer Switch Problem 14 No Battery Charge Load Shed Transfer SwitchTest 26 Check Voltage at Terminal Lugs E1, E2 If the generator has been shut down, proceed as followsTest 27 Check Manual Transfer Switch Operation Manual Transfer Switch OperationReconnect the J2 connector to the PCB Test 28 Check 23 and 15B WiringPROCEDURE/ Results Test 29 Test Transfer Relay Tr Remove the J2 connector from the circuit boardSet VOM to measure DC voltage Test 31 Check Wire Test 30 Standby Control CircuitSW1 Output Test 32 Utility Control CircuitN2A Test 33 Test Limit Switch SW2 and SW3 Test 34 Check Fuses F1 and F2Test 36 Check N1 and N2 Voltage Test 35 Check N1 and N2 WiringReplace blown fuses as needed Test 38 Check Utility Sense Voltage Test 37 Check Utility Sensing Voltage at the Circuit BoardTest 39 Check Voltage at Terminal Lugs N1, N2 Transfer Switch GeneratorMeasure across points a and C VAC should be measured Test 40 Check Battery ChargerTest 42 Check Wire 0 and Wire15B Pre-wire load center Measure across points M and N VDC should be measuredTest 45 Check Wire 0/15B Rtsn & Rtse Transfer Switch Rtsn & Rtse Transfer SwitchMeasure across points E and F VAC should be measured 15B Test 43, 44, and 45 Rtse Transfer Switch Test Points Test 48 Check Wire 0/15B GenReady Load Center Disconnect the J2 connector from the printed circuit boardSection Measure across points C and D VAC should be measured Load Shed Transfer SwitchMeasure across points E and D VAC should be measured ATS LSSLSC Test 51 Check Wire 0 and Wire 15B Load Shed Transfer Switch Part DC Control Terminal Strip / Interconnection Auto-Off-Manual SwitchDescription and components Part Circuit BoardDescription and components Amp FuseKW Printed Circuit Boards and J1 Connector J2 Connector PCB END J1 Connector Stepper Motor Harness END Remote Wireless ConnectionHarness END Remote Wireless Connection N1/N2 Connector PCB END Harness END17 and 20 kW Printed Circuit Board and J1 Connector Choke Solenoid Connector Pin Number Identification Menu System NavigationDescription ComponentsStator 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 21 Generator Will Not Exercise Problem 20 7.5 Amp Fuse F1 BlownProblem 22 No Low Speed Exercise Test 58 Auto-Off-Manual Switch Twin Only Test 56 Check Position Of Auto-Off Manual SwitchTest 57 Try a Manual Start Test 59 Test Auto Operations Test 61 Check BatteryTest 60 Check 7.5 Amp Fuse Test Battery Condition Typical Battery Load TesterTest 63 Test Starter Contactor Relay V-twin Only Test 62 Check Wire 56 VoltageIf battery voltage is indicated in refer back to flow chart Set a VOM to measure DC voltageReconnect Wire 13 to the SCR Test 64 Test Starter Contactor Single Cylinder EngineChecking the Pinion Test 65 Test Starter MotorShorted, open or grounded armature PinionPinion Tools for Starter Performance TestPort Test 66 Check Fuel Supply PressureSolenoid Removed Test 67 Check Circuit Board Wire Output 12-20 kW Gas Pressure Test pointTest 68 Check Fuel Solenoid Disconnect the C3 ConnectorTest 69 Check Choke Solenoid Approximately 3.7 ohms should be measured Solenoid De-Energized, Choke Closed KW UnitsDisconnect C3 Connector Set a VOM to measure resistance Disconnect the C3 Connector Set a VOM to measure DC voltageTest 70 Check for Ignition Spark KW Choke Solenoid Test 71 Check Spark Plugs Repeat Steps 1 through 8 on remaining cylinder Test 73 Check Shutdown WireRemove a spark plug Check CompressionTest 74 Check and Adjust Ignition Magnetos Depending on engine type, do the followingSetting Ignition Magneto Armature Air Gap MagnetoCylinder One Back, Short Check engine crankcase oil level Test 75 Check Oil Pressure Switch WireNavigate to the Digital inputs display screen With oil level correct, try starting the engineReplace switch if it fails the test Test 76 Check High Oil Temperature SwitchTest 77 Check and Adjust Valves Remove the High Oil Temperature SwitchSet the AUTO-OFF-MANUAL switch to the Manual position Test 78 Check Wire 18 ContinuityBall Stud JAM NUT Test 80 Check Cranking and Running Circuits Test 79 Test Exercise FunctionRecord the current date and time of the unit Choke Solenoid 8kWTest 82 Check operation Choke Solenoid Test 81 Check to see if Low Speed Function is enabledDisconnect Wire 4 and Wire 0 from the Voltage Regulator VR If the solenoid closed, replace the controllerPart Operational Tests Electrical Checks Manual Transfer Switch OperationSystem functional tests Part Set the generator main line circuit breaker to OFF or openSystem functional tests Generator Tests Under LoadVerify that the AUTO-OFF-MANUAL switch is set to Auto Setting The Exercise TimerChecking Automatic Operation Part Disassembly Front Engine Access Major Disassembly PartRemove control harnesses 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 Wiring Diagram, 8 kW Home Standby Part Drawing #0G7945Wiring Diagram, 8 kW Home Standby Schematic, 8 kW Home Standby Part Drawing #0G8511Part Schematic, 8 kW Home Standby Wiring Diagram, 10 kW Home Standby Part Drawing #0G7946Part Wiring Diagram, 10 kW Home Standby Schematic, 10 kW Home Standby Part Drawing #0G8512Part Schematic, 10 kW Home Standby Wiring Diagram, 14 kW Home Standby Part Drawing #0G7947Part Wiring Diagram, 14 kW Home Standby Schematic, 14 kW Home Standby Part Drawing #0G8513Part Schematic, 14 kW Home Standby Wiring Diagram, 17 kW Home Standby Part Drawing #0G7948Part Wiring Diagram, 17 kW Home Standby Schematic, 17 kW Home Standby Part Drawing #0G8514Part Schematic, 17 kW Home Standby Wiring Diagram, 20 kW Home Standby Part Drawing #0G8186Part Wiring Diagram, 20 kW Home Standby Schematic, 20 kW Home Standby Part Drawing #0G8515Part Schematic, 20 kW Home Standby Transfer Switch, 9/10/12/16 circuit Wiring Diagram, Home StandbyPart Wiring Diagram, Home Standby Schematic, Home Standby Drawing #0G7959Page Page Page MyGenerac.com