Table of Contents
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DCA6~DCA600 60Hz
Generators, Service and
Troubleshooting Manual
Proposition 65 Warning ........................................... 2
Safety Information ................................................ 4-9
Generator Theory ............................................. 10-15
Heat Rise .......................................................... 16-17
Load Banking/Wet Stacking .................................. 18
Engine/Generator Inspection ................................. 19
Electrical Inspection .......................................... 20-22
Component Identification .................................. 23-29
Current Flow Diagram .......................................... 30
Voltage Flow Diagram .......................................... 31
Rheostat Diagram ................................................. 32
Receptacles Diagram ........................................... 33
Main Armature Windings Resistance Test ........ 34-35
Main Field/Exciter Armature Resistance Test ........ 36
Exciter Field Resistance Test ................................ 37
Manual Excitation Field Voltage Test ..................... 38
Manual Excitation Winding Voltage Test ................ 39
Exciter Field Voltage Measurement (Load) .......... 43
Rotating Rectifier Test ...................................... 44-45
Automatic Voltage Regulator ............................ 47-48
Main Circuit Breaker ......................................... 49-50
ECU 9988N ...................................................... 51-55
Overcurrent Relay (OCR) ................................. 56-57
Voltage Selector Switch .................................... 58-59
Ground Fault Circuit Interrupter (GFCI) ................. 60
Fuel Pump Relay .............................................. 62-63
Engine Starter (Crank) Relay ........................... 64-65
Engine Glow Plug Relay ........................................ 66
Magnetic Pickup Unit ........................................ 67-68
Frequently Asked Questions ............................. 70-71
Frequently Asked Questions .................................. 71
GENERATOR SERVICE AND TROUBLESHOOTING MANUAL - REV. #0 (08/29/23) - PAGE 3
TABLE OF CONTENTS
Definitions ......................................................... 72-73
Alternator Resistance Chart .................................. 74
Exciter Field Current and Voltage Table ................ 75
Generator Weights and Lifting Points Table .......... 76
Torque Specifications Table ................................... 77
ECU-845 AC Fault Codes ................................. 78-81
Ovrcurrent Relay Trip Point Table .......................... 82
Troubleshooting (Engine) ................................. 83-84
Troubleshooting Flowcharts ............................. 85-92
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