Generac Power Systems 16 kW NG, 10 kW LP, 13 kW NG, 7 kW NG, 9 kW NG, 8 kW LP manual Part DC Control

PART 4

DC CONTROL

Air-cooled, Automatic
Standby Generators
4.1 Description and Components	96
General	96
Terminal Strip / Interconnection Terminal	96
Circuit Board	96
Auto-Off-Manual Switch	96
7.5 Amp Fuse	96
Menu System Navigation	102
4.2 Operational Analysis	104
Introduction	104
Utility Source Voltage Available	104
Initial Dropout of Utility Source Voltage	106
Utility Voltage Dropout and
Engine Cranking	108
Engine Startup and Running	110
Initial Transfer to the “Standby” Source	112
Utility Voltage Restored /
Re-transfer to Utility	114
Engine Shutdown	116
4.3 Troubleshooting Flowcharts	118
Problem 15 – Engine Will Not Crank
When Utility Power Source Fails	118
Problem 16 – Engine Will Not Crank When
AUTO-OFF-MANUAL Switch
is Set to “MANUAL	118
Problem 17 – Engine Cranks
but Won’t Start	119
Problem 18 – Engine Starts Hard and
Runs Rough / Lacks Power / Backfires	120
Problem 19 – Shutdown Alarm /
Fault Occurred	121
Problem 20 – 7.5 Amp Fuse (F1) Blown	122
Problem 21 – Generator Will Not Exercise	122
Problem 22 – No Low Speed Exercise	122
4.4 Diagnostic Tests	123
Introduction	123
Test 56 – Check Position Of
Auto-Off- Manual Switch	123

Table of contents
Part	Title	Page#
4.1.	Description and Components	76
4.2	Operational Analysis	82
4.3	Troubleshooting Flow Charts	96
4.4	Diagnostic Tests	103

Test 57 – Try a Manual Start	123
Test 58 – Auto-Off-Manual Switch
(V-Twin Only)	123
Test 59 – Test Auto Operations	124
Test 60 – Check 7.5 Amp Fuse	124
Test 61 – Check Battery	124
Test 62 – Check Wire 56 Voltage	126
Test 63 – Test Starter Contactor Relay
(V-twin Only)	126
Test 64 – Test Starter Contactor
(Single Cylinder Engine)	127
Test 65 – Test Starter Motor	128
Test 66 – Check Fuel Supply and Pressure	130
Test 67 – Check Circuit Board
Wire 14 Output	131
Test 68 – Check Fuel Solenoid	132
Test 69 – Check Choke Solenoid	132
Test 70 – Check for Ignition Spark	134
Test 71 – Check Spark Plugs	136
Test 72 – Check Engine / Cylinder Leak
Down Test / Compression Test	136
Test 73 – Check Shutdown Wire	137
Test 74 – Check and Adjust
Ignition Magnetos	138
Test 75 – Check Oil Pressure Switch
and Wire 86	141
Test 76 – Check High Oil
Temperature Switch	142
Test 77 – Check and Adjust Valves	142
Test 78 – Check Wire 18 Continuity	143
Test 79 – Test Exercise Function	144
Test 80 – Check Cranking and
Running Circuits	144
Test 81 – Check to see if Low Speed
Function is enabled	146
Test 82 – Check operation of the
Choke Solenoid	146

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