Table Of Contents - Generac Power Systems 7 kW NG Repair Manual

Specifications ......................................................................4
Generator ............................................................... 4
Engine .................................................................... 5
Fuel Consumption ................................................... 5
Mounting Dimensions ............................................. 6
Major Features ........................................................ 8
PART 1 - General Information..............................................9
Section 1.1 - Generator Basics ......................................... 10
Introduction .......................................................... 10
Parts .................................................................... 10
Generator Identification ......................................... 10
Section 1.2 - Installation Basics ....................................... 11
Introduction .......................................................... 11
Selecting a Location ............................................. 11
NFPA 37 Code Requirements ................................ 11
Grounding the Generator ....................................... 11
The Fuel Supply .................................................... 11
Natural Gas Fuel Interconnections ......................... 14
Transfer Switch / Load Center ............................... 14
Power Source and Load Lines ............................... 14
System Control Interconnections .......................... 15
Section 1.3 - Preparation Before Use ................................ 16
Introduction .......................................................... 16
Reconfiguring the fuel system ............................... 17
Section 1.4 - Measuring Electricity ................................... 19
Meters .................................................................. 19
The VOM .............................................................. 19
Measuring AC Voltage ........................................... 19
Measuring DC Voltage ........................................... 19
Measuring AC Frequency ...................................... 19
Measuring Current ................................................ 20
Measuring Resistance ........................................... 20
Electrical Units ...................................................... 21
Ohm's Law ........................................................... 21
Section 1.5 - Testing, Cleaning and Drying ........................ 22
Visual Inspection .................................................. 22
The Megohmmeter ............................................... 22
Cleaning the Generator .......................................... 23
Drying the Generator ............................................. 23
Section 1.6 - Operating Instructions ................................. 25
Control Panel ........................................................ 25
User Interface ....................................................... 25
To Select Automatic Operation .............................. 26
Manual Operation.................................................. 26
Section 1.7 - Automatic Operating Parameters .................. 27
Introduction .......................................................... 27
Utility Failure ......................................................... 27
Cranking ............................................................... 27
Cranking Conditions .............................................. 27
Load Transfer Parameters ..................................... 27
Utility Restored ..................................................... 28
Section 1.8 - General Maintenance ................................... 29
Introduction .......................................................... 29
Maintenance Message .......................................... 29
Air Filter ................................................................ 29
Spark Plugs .......................................................... 29
Visual Inspection .................................................. 29
Corrosion Protection ............................................. 30
Valve Clearance .................................................... 30
Battery ................................................................. 30
Section 1.9 - Wireless Remote ......................................... 32
Wireless Monitor................................................... 32
Wireless Basic Troubleshooting. ............................ 32
Wireless Advanced Module ................................... 33
Wireless Advanced Features ................................. 33
Wireless Advanced Troubleshooting. ..................... 33
Section 1.10 - Control Panel Menu System Navigation ...... 35
Main Menu ........................................................... 35
Section 1.11 - General Troubleshooting Guidelines ........... 38
Introduction .......................................................... 38
Recommended Tools ............................................ 38
Troubleshooting Reminders and Tips ..................... 38
Important Note concerning connectors ................. 38
PART 2 - AC Generators ....................................................39
Section 2.1 - Description and Components ....................... 40
Introduction .......................................................... 40
Engine-Generator Drive System ............................. 40
Alternator Assembly ............................................. 40
Other AC Generator Components .......................... 40
Section 2.2 - Operational Analysis .................................... 42
Rotor Residual Magnetism .................................... 42
Field Boost ........................................................... 42
Operation .............................................................. 42
Section 2.3 - Troubleshooting Flowcharts ......................... 44
Introduction .......................................................... 44
Problem 1 - Generator Shuts Down
for Under-voltage .............................. 44
Problem 2 - Generator Shuts Down
for High Voltage ................................ 45
Problem 3 - Voltage and Frequency Drop
Excessively When Loads Are Applied . 46
Problem 4 - Unstable Voltage or Incorrect Output
Which is Not Triggering a Shutdown .. 46
Section 2.4 - Diagnostic Tests .......................................... 47
Introduction .......................................................... 47
Safety ................................................................... 47
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