Generac Power Systems 9 kW NG, 10 kW LP, 13 kW NG, 7 kW NG, 8 kW LP Automatic Operating Sequences

Contents
Specifications	4
Generator	4
Engine	5
Fuel Consumption	5
Mounting Dimensions	6
Mounting Dimensions	7
Major Features	8
PART 1 - GENERAL INFORMATION	9
1.1 Generator Identification	10
Introduction	10
1.2 Installation Basics	11
Introduction	11
Selecting A Location	11
Grounding The Generator	11
The Fuel Supply	11
The Transfer Switch / Load Center	11
Power Source And Load Lines	13
System Control Interconnections	13
Natural Gas Fuel Interconnections	13
1.3 Non-prepackaged Interconnections	14
Connect a Pre-2008 Load Center Switch
To a Current or Future
Air-Cooled Generator	14
Connect a 2008 And Later Load Center
Switch to a Pre-2008
Air-Cooled Generator	15
1.4 Preparation Before Use	16
General	16
Fuel Requirements	16
Fuel Consumption	16
Reconfiguring The Fuel System	16
Engine Oil Recommendations	18
1.5 Testing, Cleaning and Drying	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
Visual Inspection	22
Insulation Resistance	22
The Megohmmeter	22
Stator Insulation Resistance Test (12-20 kW)	23
Stator Insulation Resistance Test (8-10 kW)	23
Rotor Insulation Resistance Test (8-10 kW)	24
Rotor Insulation Resistance Test (12-20 kW)	24
Cleaning The Generator	24
Drying The Generator	24

1.6 Engine-Generator Protective Devices	25
General	25
Low Battery	25
Low Oil Pressure Shutdown	25
High Temperature Switch	25
Overspeed Shutdown	25
Rpm Sensor Failure	25
Overcrank Shutdown	26
1.7 Operating Instructions	27
Control Panel	27
To Select Automatic Operation	28
Manual Transfer To “Standby”
and Manual Startup	28
Manual Shutdown And
Retransfer Back To “Utility”	28
1.8 Automatic Operating Parameters	29
Introduction	29
Automatic Operating Sequences	29
PART 2 - AC GENERATORS	31
2.1 Description and Components	32
Introduction	32
Engine-Generator Drive System	32
The AC Generator	32
Rotor Assembly	32
Stator Assembly	33
Brush Holder And Brushes (12-20 kW)	34
Other AC Generator Components	34
2.2 Operational Analysis	35
Rotor Residual Magnetism	35
Field Boost (12-20 kW)	35
Operation (8/10 kW)	36
Operation (12-20 kW)	36
2.3 Troubleshooting Flowcharts	37
Problem 1 – Generator Produces Zero
Voltage or Residual Voltage (12-20 kW)...	37-38
Problem 2 – Generator Produces Zero
Voltage or Residual Voltage (8/10 kW)	38
Problem 3 – Generator Produces
Low Voltage at No-Load	39
Problem 4 – Generator Produces
High Voltage at No-Load	39
Problem 5 – Voltage and Frequency Drop
Excessively When Loads are Applied	40
2.4 Diagnostic Tests	41
Introduction	41
Safety	41
Test 1 – Check Main Circuit Breaker	41
Test 2 – Check AC Output Voltage	41
Test 4 – Fixed Excitation Test/Rotor
Amp Draw Test	42
Test 5 – Wire Continuity (12-20 kW)	43
Test 6 – Check Field Boost (12-20 kW)	44

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