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 Utility Restored

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 68

Section 3.2

Operational analysis

Part 3

Transfer switch

Utility Restored

Utility voltage is restored and is available to Terminals N1 and N2. The utility voltage is sensed by the generators circuit board. If it is above a preset value for a preset time interval a transfer back to utility power will occur.

								0		0
		E1					15B
		E1						15B		15B
		N1A						15B		15B
		N1A
		7	7	9	9		A	23		23
								23		23
	E1						TR1
	E1	1		4	3	6	TR1
		1		4	3	6	23 B
	N1A						23 B		F2
		126			205					N2
		126			205			N2A
								N2A		F1
				N1A					N1A	N1
-	+							N1A
BLK	RED							N1A		E1
WIRE	WIRE							E1		E1
	BC								E1	E2
	BC

									E2	NEUTRAL
										CONNECTION
	B									INSIDE
	B									SWITCH
								N2A
				126		B 205		N1A
				126			N2A	N1A
							N2A
								E1		CIRCUIT 14
		NO			NC	NC	NO		E2	CIRCUIT 14
				SW2			SW3		E2	CIRCUIT 13
			COM				COM
	B									CIRCUIT 10
	N2A			VR1			VR2
	N2A
	A				C1		C2			CIRCUIT 9
				SW1				T1 T1 T2		CIRCUIT 6
				SW1						CIRCUIT 6
										CIRCUIT 5

0		CONTROL

15B

		TRANSFER

23

N2 UTILITY

SENSING

240VAC

N1 OUTPUT

BLACK

RED

NEUTRAL (WHITE) GROUND (GREEN)

GROUND (GREEN) NEUTRAL (WHITE)

RED (MAIN 2)

BLACK (MAIN 1)

TS TO GENERATOR CONTROL PANEL

TO GENERATOR OUTPUT

240VAC TO

MAIN DISTRIBUTION PANEL

N2A
B	E2	CIRCUIT 2
		CIRCUIT 2
F3
T1	T1	CIRCUIT 1
	T2	CIRCUIT 3
B	E2	CIRCUIT 4
		CIRCUIT 7

	LEGEND		CIRCUIT 8
	BC-BATTERY CHARGER
	C1-UTILITY COIL & RECTIFIER		CIRCUIT 11
	C2-GENERATOR COIL & RECTIFIER
	F1,F2,F3-5A, 600V FUSE		CIRCUIT 12
	LC-CIRCUIT BREAKER (LOADS)
	(16 CIRCUIT SHOWN FOR REFERENCE ONLY)		CIRCUIT 15
	N-NEUTRAL
	SW1-AUTOMATIC TRANSFER SWITCH	UTILITY	CIRCUIT 16
	SW2,SW3-LIMIT SWITCHES		LC
	TB1-TERMINAL STRIP	DC	LC
	TB1-TERMINAL STRIP	DC

TR1-TRANSFER RELAY		GROUND

		GENERATOR

8 CIRCUIT LOAD CENTER

10 CIRCUIT LOAD CENTER

12 CIRCUIT LOAD CENTER

14 CIRCUIT LOAD CENTER

16 CIRCUIT LOAD CENTER

Figure 7. Utility Restored, Generator Still Providing Output to Load.

Page 66

Image 68

Generac Power Systems 14 kW LP, 10 kW LP, 13 kW NG, 7 kW NG Utility Restored, Generator Still Providing Output to Load

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 Generator Identification Part IntroductionNeutral Floating Rainproof Enclosure Fitted Rated Ambient Temp 40CInstallation basics Transfer Switch / Load CenterSelecting a Location 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 EnginesReconfiguring The Fuel System Preparation Before Use PartGeneral Fuel RequirementsInstall the battery, door and close the roof Preparation before useEngine Oil Recommendations Meters VomMeasuring AC Voltage Measuring DC VoltageMeasuring Resistance Testing, cleaning and drying PartMeasuring Current Volts Amps Ohms Electrical UnitsOhm’s Law Visual Inspection Insulation ResistanceMegohmmeter ONE 1 SecondStator Insulation Resistance Test 10 kW Repeat between Wire 2 and Stator LeadStator Insulation Resistance Test 12-20 kW Cleaning The Generator Rotor Insulation Resistance Test 10 kWRotor Insulation Resistance Test 12-20 kW Drying The GeneratorLow Battery High Temperature SwitchLow Oil Pressure Shutdown Overspeed ShutdownEngine-generator protective devices Part Overcrank ShutdownOperating Instructions Control PanelKW Installation Assistant Operating instructions PartTo Select Automatic Operation Manual Transfer To Standby Manual StartupAutomatic operating parameters Seconds then re-crank if additional crank cycles existAutomatic operating parameters Part ManualAuto ExercisePart AC Generators AC Generator Rotor AssemblyEngine-Generator Drive System Stator Assembly Description & componentsDescription & components Part Brush Holder And Brushes 12-20 kWOther AC Generator Components Main Line Circuit BreakerRotor Residual Magnetism Field Boost 12-20 KWOperational analysis Part Operation 8/10 kWOperation 12-20 kW StartupTroubleshooting 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 Safety Test 1 Check Main Circuit BreakerTest 2 Check AC Output Voltage ResultsDiagnostic tests Part Remove jumper lead connected to Wire 4 and Wire 15BProcedure Test 4 Fixed Excitation Test Rotor Amp Draw TestExample 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 Meter lead to Wire Repeat using Wires 2Test 10 Test DPE Winding on Brushless units MeasuredRemove Wire 4 from the voltage regulator Test 11 Resistance Check Rotor Circuit 12-20 kWTest 12 Check Brushes And Slip Rings 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 FrequencyLoosen the governor clamp bolt Figure Remove air cleaner cover to access stepper motorTest 16 Check Stepper Motor Control V-twin Engine Units Test 17 Check And Adjust Voltage Regulator 12-20 kW Pull ARM this Direction to Close ThrottleRefer back to flow chart Test 18 Check Voltage Frequency Under LoadTest 20 Check Engine Condition Test 21 Field Flash Alternator KW UnitsConstruction of Energizing Cord Page Transfer General Enclosure Item DescriptionTransfer Mechanism Transfer RelayNeutral Lug Manual Transfer HandleTerminal Block Utility N1 and N2Fuses F3 Fuse HolderFuses F1, F2 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 UtilityProblem 7 In Automatic Mode, No Transfer to Standby Troubleshooting flow charts PartIntroduction To Troubleshooting Troubleshooting flow charts Problem 9 Blown F1 or F2 FuseCheck N1 & N2 Problem 11 No Battery Charge Pre-Wire Load Center Problem 12 No Battery Charge Rtsn & Rtse Transfer SwitchProblem 13 No Battery Charge GenReady Load Center 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 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 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 F2Replace 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 Transfer Switch GeneratorTest 40 Check Battery Charger Test 42 Check Wire 0 and Wire15B Pre-wire load centerMeasure across points a and C VAC should be measured Measure across points M and N VDC 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 Test 48 Check Wire 0/15B GenReady Load Center Disconnect the J2 connector from the printed circuit boardSection 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 Auto-Off-Manual Switch Description and components PartTerminal Strip / Interconnection 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 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 Test Battery Condition Typical Battery Load TesterTest 62 Check Wire 56 Voltage If battery voltage is indicated in refer back to flow chartTest 63 Test Starter Contactor Relay V-twin Only Set a VOM to measure DC voltageReconnect Wire 13 to the SCR Test 64 Test Starter Contactor Single Cylinder EngineTest 65 Test Starter Motor Shorted, open or grounded armatureChecking the Pinion PinionPinion Tools for Starter Performance TestSolenoid Removed Test 66 Check Fuel Supply PressurePort Test 67 Check Circuit Board Wire Output 12-20 kW Gas Pressure Test pointTest 69 Check Choke Solenoid Disconnect the C3 ConnectorTest 68 Check Fuel Solenoid Approximately 3.7 ohms should be measured Solenoid De-Energized, Choke Closed KW UnitsTest 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 Test 73 Check Shutdown Wire Remove a spark plugRepeat Steps 1 through 8 on remaining cylinder Check CompressionTest 74 Check and Adjust Ignition Magnetos Depending on engine type, do the followingSetting Ignition Magneto Armature Air Gap MagnetoCylinder One Back, Short Test 75 Check Oil Pressure Switch Wire Navigate to the Digital inputs display screenCheck engine crankcase oil level With oil level correct, try starting the engineTest 76 Check High Oil Temperature Switch Test 77 Check and Adjust ValvesReplace switch if it fails the test Remove the High Oil Temperature SwitchBall 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 Choke Solenoid 8kWTest 81 Check to see if Low Speed Function is enabled Disconnect Wire 4 and Wire 0 from the Voltage Regulator VRTest 82 Check operation Choke Solenoid If the solenoid closed, replace the controllerPart Operational Tests Manual Transfer Switch Operation System functional tests PartElectrical Checks Set the generator main line circuit breaker to OFF or openSystem functional tests Generator Tests Under LoadChecking 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 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