Generac Power Systems 7 kW NG User Manual

PART 2
AC GENERATORS
Air-cooled, Automatic
Standby Generators
Page 39
TABLE OF CONTENTS
SECTION TITLE PAGE
2.1 Description and Components 40
2.2 Operational Analysis 42
2.3 Troubleshooting Flow Charts 44
2.4 Diagnostic Tests 47
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
Section 2.4 – Diagnostic Tests .......................................... 47
Introduction .......................................................... 47
Safety ................................................................... 47
AC Troubleshooting............................................... 47
Test 1 – Check AC Output Voltage ......................... 47
Test 3 – Calibrate Voltage ...................................... 48
Test 4 – Fixed Excitation Test/
Rotor Amp Draw Test ............................... 48
Test 5 – Test Sensing CircuitWires 11 and 44 ........ 51
Test 6 – Test Excitation WindingCircuit 2 and 6 ...... 52
Test 7 – Test the Stator with a VOM ....................... 52
Test 8 – Resistance Check of Rotor Circuit ............ 54
Test 9 – Check Brushes and Slip Rings ................. 54
Test 10 – Test Rotor Assembly .............................. 55
Test 11 – Check AC Output Frequency ................... 55
Test 12 – Check Stepper Motor Control ................. 56
Test 14 – Check Voltage and
Frequency under Load ........................... 57
Test 15 – Check for an Overload Condition ............ 57
Test 16 – Check Engine Condition ......................... 57

Generac Power Systems 7 kW NG Specifications

General

Brand	Generac Power Systems
Model	7 kW NG
Category	Portable Generator
Language	English