Generac Power Systems 5412, 5411, 5413, 5415 Test 26 Check Wire 14 Power Supply, Fuel Regulator

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Section 7

DIAGNOSTIC TESTS

The greater the airflow through the carburetor venturi, the lower the pressure at the venturi throat. The lower the pressure at the venturi throat, the greater the dia- phragm movement, and the greater the movement of the regulator valve. The more the regulator valve opens, the greater the gas flow that is proportional to airflow through the generator.

The following facts about the secondary regulator must be emphasized:

•The regulator must be sensitive to venturi throat pressure changes throughout the operating range.

•The regulator must be properly adjusted so it will stop the flow of gas when the engine is not running (no air flow through the carburetor).

•The slightest airflow (and vacuum in the venturi throat) should move the regulator valve off its seat and permit gas to flow.

Procedure:

A water manometer or a gauge that is calibrated in “ounces per square inch” may be used to measure the fuel pressure. Fuel pressure at the inlet side of the LPG Shut Off Valve should be between 11-14 inches water column as measured with a manometer. The LP system must be able to maintain 11-14 inches water column under all load requirements.

1.Turn LP supply to generator off.

2.Remove the Gas Pressure Tap from the fuel regu- lator and install manometer to this port.

3.Turn LP supply to generator on, the gauge should read 11-14 inches water column.

4.For Problem 8 only (Section 6), start the engine and the gauge should read 11-14 inches water column.

 

 

FUEL HOSE

GAS

 

BRASS

PRESSURE

 

HOSE

TAP

 

FITTING

Figure 7-29. – Fuel Regulator

RESULTS:

1.If the LP gas pressure is less than 11-14 inches water column the fuel supply system must be corrected in order to maintain 11-14 inches water column.

2.If the LP gas pressure is between 11-14 inches water Column, proceed to Test 26 for Problem 7 (Section 6). Proceed to Test 29 for Problem 8 (Section 6).

Test 26 – Check Wire 14 Power Supply

DISCUSSION:

When the engine is cranked, Printed Circuit Board action must deliver battery voltage to the Wire 14 cir- cuit, or the engine will not start. This is because the Wire 14 circuit will operate the Fuel Pump and Fuel Solenoid on Gasoline models. On LP models it oper- ates the LPG Shut-off valve.

PROCEDURE:

Inside the generator panel, locate the 4-tab Connector (Figure 7-30). Then, proceed as follows:

Figure 7-30. – The 4-tab Connector

1.Set a VOM to read battery voltage (12 VDC).

2.Connect the meter positive (+) test lead to the 4- tab Connector, the common (-) test lead to frame ground.

3.Crank the engine and the meter should read bat- tery voltage. If battery voltage is not measured, proceed to Step 4.

4.Check Wire 14 for poor connection from the 4-tab Connector to the Printed Circuit Board.

5.Crank the engine. The meter should indicate bat- tery voltage.

RESULTS:

1.If the meter indicated battery voltage, go to Test 20 “Check Start-Stop Switch”.

2.If battery voltage was NOT indicated in Step 3 but is indicated in Step 5, check Wire 14 between the 4-tab Connector and the Printed Circuit Board.

a.Repair, reconnect or replace Wire 14 as neces- sary.

3.If battery voltage was not indicated in Step 5, replace the Printed Circuit Board.

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Contents Diagnostic Repair Manual Safety Table of Contents Section Electrical Data 78-79 Magnetism Electromagnetic FieldsElectromagnetic Induction Simple AC Generator More Sophisticated AC GeneratorGenerator Operating Diagram Field Boost Generator AC Connection SystemConnection for 120 Volts Only Rotor Assembly Stator AssemblyBrush Holder Excitation Circuit ComponentsCrankcase Breather DescriptionControl Panel Component Identification Control Panel ComponentsInsulation Resistance Testers Cleaning the GeneratorEffects of Dirt and Moisture Drying the GeneratorStator Insulation Resistance Testing Rotor Insulation Testing Rotor InsulationTesting Stator Insulation MegohmmeterMeasuring AC Voltage MetersVOM Measuring DC VoltageMeasuring Current Measuring ResistanceElectrical Units Ohm’s LawIntroduction Operational AnalysisCircuit Condition Cranking Circuit Condition Running Circuit Condition Shutdown Battery Cables BatteryRecommended Battery Printed Circuit BoardStart-Stop Switch Amp FuseStart-Stop Switch Starter Contactor Relay Starter MotorIf Problem Involves AC Output Problem 1 Voltage & Frequency Are Both High or LowTest Troubleshooting Flowcharts Proble 5 Priming Function Does Not Work Gasoline Models Problem 6 Engine Will Not Crank Test 26 Check Test 20 Check Check Fuel Wire 14 Power Good Troubleshooting Flowcharts Problem 8 Engine Starts Hard and Runs Rough Gasoline Units Problem 8 Engine Starts Hard and Runs Rough LP Units LOW OIL Pressure Flashes on SW1 LED Problem 10 7.5A F1 Fuse Blowing YESTest 2 Check Stepper Motor Control ProcedureTest 1 Check No-Load Voltage Frequency DiscussionSix Pin J2 Connector Wire Colors Test 4 Fixed Excitation Test/Rotor Amp DrawFixed Excitation Test, Step B Test 5 Check Field Boost Test 6 Test Stator DPE WindingTest 7 Check Sensing Leads / Power Windings Stator Excitation WindingStator Power Winding Leads Test 8 Check Brush LeadsTest 10 Check Rotor Assembly Test 9 Check Brushes & Slip RingsTest 12 Check Load Voltage Frequency SchematicTest 11 Check Main Circuit Breaker Test 13 Check Load Watts AmperageTest 14 Try Cranking the Engine Test 15 Check Fuel PumpTest 17 Check Battery & Cables Test 18 Check Power Supply to Printed Circuit BoardTest 16 Check 7.5 Amp Fuse Test 19 Check Continuity of Wire Test 20 Check Start-Stop SwitchTest 21 Check Power Supply to Wire Test 22 Check Starter Contactor RelayTest 23 Check Starter Contactor Test 24 Check Starter MotorChecking the Pinion PinionTools for Starter Performance Test Minimum rpm 4500 Maximum Amps Test 25 Check Fuel Supply To Carburetor GASTest 26 Check Wire 14 Power Supply 29. Fuel RegulatorTest 27 Check Wire Test 28 Check Fuel Solenoid Gasoline ModelsTest 29 Check Ignition Spark Tools RequiredTwo Ignition Testers Generac P/N 0C5969Test 31 Check and Adjust Ignition Magnetos Test 30 Check Spark Plugs37. Setting Ignition Magneto Armature Air Gap Test 32 Check Valve Adjustment Checking Flywheel MagnetFlywheel KEY Test 33 Check Carburetion Test 34 Check Choke SolenoidTo Control Solenoid PanelTest 36 Check Oil Pressure Switch Test 37 Check Wire 86 for Continuity Test 38 Test Oil Temperature SwitchTest 39 Check Wire 85 for Continuity Test 40 Test Choke HeaterTest 41 Check LPG Fuel Solenoid Section Exploded Views QTY Description Enclosure Drawing No G3881-C Enclosure Door Views Screw Plastite HI-LOW #10X3/8 Engine Accessories Drawing No G7718-B QTY Description 48,49 Square Head Plug Rotor & Stator Drawing No G3953-b NUT TOP Lock FL M8-1.25 Charts Generator Specifications Nominal Resistances of Generator Windings at 68fElectrical Data Electrical Data OG7515 REV. a

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