Generac Power Systems 75, 55, 65 manual Electrical Units, Ohms LAW, Ampere, Volt

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Section 4

MEASURING ELECTRICITY

ELECTRICAL UNITS

AMPERE:

The rate of electron flow in a circuit is represented by the AMPERE. The ampere is the number of electrons flowing past a given point at a given time. One AMPERE is equal to just slightly more than six thou- sand million billion electrons per second.

With alternating current (AC), the electrons flow first in one direction, then reverse and move in the oppo- site direction. They will repeat this cycle at regular intervals. A wave diagram, called a “sine wave” shows that current goes from zero to maximum posi- tive value, then reverses and goes from zero to maxi- mum negative value. Two reversals of current flow is called a cycle. The number of cycles per second is called frequency and is usually stated in “Hertz”.

VOLT:

The VOLT is the unit used to measure electrical PRESSURE, or the difference in electrical potential that causes electrons to flow. Very few electrons will flow when voltage is weak. More electrons will flow as voltage becomes stronger. VOLTAGE may be consid- ered to be a state of unbalance and current flow as an attempt to regain balance. One volt is the amount of EMF that will cause a current of 1 ampere to flow through 1 ohm of resistance.

Figure 4-4. – Electrical Units

OHM:

The OHM is the unit of RESISTANCE. In every circuit there is a natural resistance or opposition to the flow of electrons. When an EMF is applied to a complete circuit, the electrons are forced to flow in a single direction rather than their free or orbiting pattern. The resistance of a conductor depends on (a) its physical makeup, (b) its cross-sectional area, (c) its length, and (d) its temperature. As the conductor's tempera- ture increases, its resistance increases in direct pro- portion. One (1) ohm of resistance will permit one (1) ampere of current to flow when one (1) volt of electro- motive force (EMF) is applied.

OHM'S LAW

A definite and exact relationship exists between VOLTS, OHMS and AMPERES. The value of one can be calculated when the value of the other two are known. Ohm's Law states that in any circuit the current will increase when voltage increases but resistance remains the same, and current will decrease when resistance Increases and voltage remains the same.

Figure 4-5.

If AMPERES is unknown while VOLTS and OHMS are known, use the following formula:

AMPERES = VOLTSOHMS

If VOLTS is unknown while AMPERES and OHMS are known, use the following formula:

VOLTS = AMPERES x OHMS

If OHMS is unknown but VOLTS and AMPERES are known, use the following:

OHMS =

VOLTS

AMPERES

 

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Contents Diagnostic Repair Manual Replacement Parts SafetyTable of Contents Section Exploded Views / Part Numbers Section Specifications & ChartsElectromagnetic Fields MagnetismElectromagnetic Induction More Sophisticated AC Generator Simple AC GeneratorGenerator Operating Diagram Generator AC Connection System Field BoostLine Breakers 120 Volts only Reconnection for Dual Voltage Output Connection for 120 Volts OnlyStator Assembly Rotor AssemblyGeneral Battery Charge ComponentsBrush Holder Excitation Circuit ComponentsDescription Adjustment ProcedureCrankcase Breather Voltage RegulatorCheck Breather Install BreatherInstall oil vapor collector and retainer Control Panel Component IdentificationDrying the Generator Cleaning the GeneratorEffects of Dirt and Moisture Insulation Resistance TestersStator SHORT-TO-GROUND Tests Brushing and Vacuum CleaningStator Insulation Resistance Cloth or Compressed AIRMegohmmeter Testing Rotor InsulationTesting Stator Insulation Testing Rotor InsulationMeasuring DC Voltage MetersVOM Measuring AC VoltageMeasuring Current Measuring AC FrequencyMeasuring Resistance Volt Electrical UnitsOhms LAW AmpereOperational Analysis IntroductionCircuit CONDITION- Rest Circuit CONDITION- Priming Circuit CONDITION- Cranking Choke Heater CH Circuit CONDITION-RUNNINGCircuit CONDITION- Shutdown Sure Switch LOP Circuit CONDITION- Fault ShutdownEngine Controller Circuit Board BatteryRecommended Battery Battery CablesSTART-STOP Switch Fuel Primer SwitchAMP Fuse Starter Contactor Relay Starter Motor Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Discussion ProcedureTest 1- Check NO-LOAD Voltage Frequency Test 2- Check Engine GovernorIf continuity was indicated, go to Test Governor AdjustmentTest 3- Test Excitation Circuit Breaker Test 4- Fixed Excitation TEST/ROTOR AMP DrawSet a VOM to its Rx1 scale Test 5- Wire ContinuityRe-connect Wire 11 and Wire 22 to the Voltage Regulator Set the VOM to measure AC voltageTest 7 Test Stator DPE Winding Test 6- Check Field BoostIf field boost checks good, replace the Voltage Regulator Model Ohms Test 8- Check Sensing Leads / Power WindingsAcross Wires Ohms 11S 22STest 10 Check Brushes & Slip Rings Test 9- Check Brush LeadsReplace the Rotor if it fails the test Test 11- Check Rotor AssemblyTance Tests Procedure Test 12 Check Main Circuit BreakerTest 13- Check Load Voltage Frequency Test 15 Check Battery Charge OutputTest 16 Check Battery Charge Rectifier Battery Charge Rectifier BCR is a full wave rectifierShort to Ground 10. Battery Charge RectifierTest 18 TRY Cranking the Engine Test 19- Test Primer SwitchSet a VOM to read battery voltage 12 VDC Also see Fuel Primer Switch,13. The LPG Fuel Solenoid FS Test 20- Check Fuel PumpTest 23- Check Power Supply to Circuit Board Test 22- Check Battery & CablesTest 21- Check 7.5 AMP Fuse 17. Start-Stop Switch Test 24 Check START-STOP SwitchSet a VOM to measure DC voltage 12 VDC Test 26- Check Starter Contactor RelayTest 27 Check Starter Motor Test 26A Check Starter ContactorConditions Affecting Starter Motor Performance Tachometer Checking the PinionTools for Starter Performance Test Measuring CurrentRemove Starter Motor Testing Starter MotorTest 28- Check Fuel Supply Test BracketDiscussion LPG Models 28 LP Gas Carburetion DiagramCrank the engine. The meter should indicate battery voltage Test 29 Check Wire 14 Power SupplyTest 30 Check Wire Battery voltage is not measured, proceed to StepTest 32 Check Ignition Spark Test 31 Check Fuel Solenoid Gasoline ModelsConclusion No cylinder is weakest of the two cylinders Cylinder Balance TestTest 33 Check Spark Plugs Test 34 Check and Adjust Ignition Magnetos37. Setting Ignition Magneto Armature Air Gap Flywheel KEY Test 35 Check Valve AdjustmentAdjusting Valve Clearance Checking Flywheel MagnetTest 36 Check Carburetion Install Rocker ARM CoverTest 37 Check Choke Solenoid 43. Connector Check Compression Adjust the regulated pressure on the gauge to 80 psiDown Test / Compression Test Repeat Steps 1 through 8 on remaining cylinderTest 40 Test OIL Temperature Switch Test 39 Check OIL Pressure SwitchIf all steps check GOOD, go to Test Test 42 Check LPG Fuel Solenoid Test 41 Test Choke HeaterShort to Ground 49. Fuel Solenoid Rotor Removal Major DisassemblyENCLOSURE/PANEL Removal Stator RemovalEngine Removal Belt TensioningStarter Removal FLYWHEEL/MAGNETO Removal Page Section Exploded Views / Part Numbers Part NO. QTY Description Enclosure Drawing No E1011-B QTY Description Sheet Metal Drawing No E1012-E Flywheel Assy GT-990 QTY DescriptionControl Panel Drawing No E1013-A PANEL, TOP Control Wire ASM GRD STD ConnSwitch Spdt ON-MOM-ON Switch 6A Spdt Not ShownTwin Engine Drawing No E1014-B ASSEMBLY, OIL Fill CAP ASSEMBLY, Crankcase RVASSEMBLY, Breather ASSEMBLY, Head #1LP Regulator Drawing No E1530 SPRING-SOLENOID Plunger CASTING, Twin Regulator HousingWasher Flat M4 SOLENOID, Twin RegulatorSpecifications & Charts Nominal Resistances of Generator Windings AT 68F Generator SpecificationsEngine Speeds and Voltage Specifications Page Electrical Data Electrical Data PO BOX 297 WHITEWATER, WI

65, 75, 55 specifications

Generac Power Systems has established itself as a leader in power generation, offering a range of high-performance generators suited for residential and commercial applications. Among its lineup, the Generac 55, 65, and 75 kW generators stand out for their reliability, efficiency, and advanced features.

The Generac 55 kW generator is designed to provide a powerful backup solution for medium to large homes or small businesses. It features a robust engine that delivers dependable performance while maintaining fuel efficiency. One of its key characteristics is the True Power Technology, which produces clean and stable power, ensuring that sensitive electronic devices run smoothly without risk of damage. This generator is equipped with a fully automatic transfer switch, allowing for seamless power transition during outages, with minimal disruption.

Moving to the 65 kW model, it offers increased capacity while retaining the fundamental qualities of the 55 kW version. This unit is particularly suited for larger homes or commercial applications that require greater power demands. The 65 kW generator utilizes Generac’s G-Force engine, known for its durability and reduced maintenance needs. Advanced features such as remote monitoring capabilities allow users to check the generator's status from anywhere, providing peace of mind and convenience.

The 75 kW generator takes performance to the next level, making it ideal for even more significant power needs. It is engineered for both quiet operation and enhanced performance, accommodating a wide range of requirements from residential to larger commercial operations. The 75 kW model includes a full-load voltage regulation system that maintains stable power output under varying loads, safeguarding appliances and equipment.

All three models incorporate advanced air-cooled technology, which enhances their efficiency and operational lifespan. Additionally, their corrosion-resistant enclosures ensure durability even in harsh weather conditions, making them suitable for diverse environments. The intuitive LCD display on each unit provides critical information, including runtime hours and maintenance reminders, empowering users with easy access to the generator's performance data.

Overall, Generac Power Systems' 55, 65, and 75 kW generators represent a commitment to quality, reliability, and innovation in backup power solutions. They are designed to meet the demands of modern power consumption while ensuring peace of mind through robust engineering and advanced technology. Whether for home use or commercial applications, these generators provide an effective means to stay prepared for unexpected power outages.
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