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

Generac Power Systems 7 kW NG, 10 kW LP, 13 kW NG, 9 kW NG, 8 kW LP, 17 kW LP Operational Analysis

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 62

Section 3.2

Operational analysis

Part 3

Transfer switch

Operational Analysis

Figure 1 is a schematic for a typical “W/V-Type” transfer switch.

0

0

0

E1

15B

15B

15B

15B

CONTROL

N1A

TRANSFER

7

7

9

9

A

23

23

23

E1

TR1

1

4

3

6

TS TO

23 B

GENERATOR

N1A

F2

CONTROL PANEL

126

205

N2

N2

UTILITY

N2A

SENSING

F1

240VAC

N1A

N1A

N1

N1

OUTPUT

-

+

N1A

BLK

RED

E1

BLACK

E1

WIRE

WIRE

BC

E2

RED

TO GENERATOR

E1

NEUTRAL (WHITE)

OUTPUT

E2

NEUTRAL

GROUND (GREEN)

CONNECTION

B

INSIDE

GROUND (GREEN)

SWITCH

N2A

NEUTRAL (WHITE)

240VAC TO

B 205

RED (MAIN 2)

PANEL

MAIN DISTRIBUTION

126

N2A

N1A

BLACK (MAIN 1)

E1

CIRCUIT 14

NO

NC

NC

NO

E2

SW2

SW3

E2

CIRCUIT 13

COM

COM

B

CIRCUIT 10

N2A

VR1

VR2

A

C1

C2

CIRCUIT 9

SW1

T1 T1 T2

CIRCUIT 6

N2A

CIRCUIT 5

CENTER

CENTER

CENTER

CENTER

CENTER

F3

B

E2

CIRCUIT 2

T1

T1

CIRCUIT 1

LOAD

LOAD

LOAD

LOAD

LOAD

T2

CIRCUIT 3

CIRCUIT

CIRCUIT

CIRCUIT

CIRCUIT

CIRCUIT

B

E2

CIRCUIT 4

CIRCUIT 7

8

10

12

14

16

	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	CIRCUIT 16
	SW2,SW3-LIMIT SWITCHES	LC
	TB1-TERMINAL STRIP	LC
	TB1-TERMINAL STRIP

TR1-TRANSFER RELAY

Figure 1. Schematic

Page 60

Image 62

Generac Power Systems 7 kW NG, 10 kW LP manual Operational Analysis, Is a schematic for a typical W/V-Type transfer switch

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 Resistance Testing, cleaning and drying PartMeasuring Current Volts Amps Ohms Electrical UnitsOhm’s Law Megohmmeter Visual InspectionInsulation Resistance ONE 1 SecondStator Insulation Resistance Test 10 kW Repeat between Wire 2 and Stator LeadStator Insulation Resistance Test 12-20 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 AC Generator Rotor AssemblyEngine-Generator Drive System 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 4 Generator Produces High Voltage at No-Load Troubleshooting flowchartsProblem 3 Generator Produces Low 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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