Generac Power Systems 8 kW LP User Manual

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Test 7 – Testing The Stator With A Vom

(12-20 kW)...........................................44

Test 8 – Test Brushless Stator..........................45

Test 9 – Check Capacitor .................................46

Test 10 – Test DPE Winding on

Brushless units ....................................47

Test 11 – Resistance Check Of Rotor Circuit

(12-20 kW)...........................................48

Test 12 – Check Brushes And Slip Rings

(12-20 kW)...........................................48

Test 13 – Test Rotor Assembly(12-20 kW) .......49

Test 14 – Check AC Output Frequency ............49

Test 15 – Check and Adjust Engine Governor

(Single Cylinder Units) .........................49

Test 16 – Check Stepper Motor Control

(V-twin Engine Units) ...........................50

Test 17 – Check And Adjust Voltage

Regulator (12-20 kW) ..........................51

Test 18 – Check Voltage And Frequency

Under Load..........................................52

Test 19 – Check For Overload Condition ...........52

Test 20 – Check Engine Condition ...................52

Test 21 – Field Flash Alternator (8-10 kW) ......52

Part 3 - traNsfEr sWitcH ............................... 55

3.1 Description and Components .......................... 56

General ............................................................56

Enclosure .........................................................56

Transfer Mechanism .........................................57

Transfer Relay ..................................................57

Neutral Lug ......................................................58

Manual Transfer Handle ..................................58

Terminal Block .................................................58

Fuse Holder .....................................................59

3.2 Operational Analysis ....................................... 60

Operational Analysis ........................................60

Utility Source Voltage Available .......................62

Utility Source Voltage Failure ..........................63

Transfer To Standby .........................................64

Transfer To Standby .........................................65

Utility Restored.................................................66

Utility Restored, Transfer Switch De-energized ... 67

Utility Restored, Retransfer Back To Utility .......68

Transfer Switch In Utility ...................................69

3.3 – Troubleshooting Flowcharts .......................... 70

Introduction To Troubleshooting .......................70

Problem 7 – In Automatic Mode,
No Transfer to Standby ................................70

Problem 8 – In Automatic Mode, Generator
Starts When Loss of Utility Occurs,
Generator Shuts Down When Utility
Returns But There Is No Retransfer To Utility
Power / or Generator Transfers to Standby
During Exercise Or In Manual Mode............71

Problem 9 – Blown F1 or F2 Fuse ...............71

Problem 10 – Units Starts And Transfer
Occurs When Utility Power Is On .................72

Problem 11 – No Battery Charge
(Pre-Packed Load Center) ...........................73

Problem 12 – No Battery Charge
(RTSN & RTSE Transfer Switch) .................73

Problem 13 – No Battery Charge
(Gen-Ready Load Center) ...........................73

Problem 14 – No Battery Charge
(Load Shed Transfer Switch) ........................73

3.4 Diagnostic Tests .............................................. 74

General ............................................................74

Test 26 – Check Voltage at

Terminal Lugs E1, E2 ..........................74

Test 27 – Check Manual Transfer Switch

Operation .............................................75

Test 28 – Check 23 And 15B

Wiring/Connections .............................76

Test 29 – Test Transfer Relay TR ......................77

Test 30 – Standby Control Circuit ....................78

Test 31 – Check Wire 23 ..................................78

Test 32 – Utility Control Circuit .........................80

Test 33 – Test Limit Switch SW2 and SW3 ......82

Test 34 – Check Fuses F1 and F2 ...................82

Test 35 – Check N1 and N2 Wiring ..................83

Test 36 – Check N1 and N2 Voltage ................83

Test 37 – Check Utility Sensing Voltage

at the Circuit Board..............................84

Test 38 – Check Utility Sense Voltage .............84

Test 39 – Check Voltage at

Terminal Lugs N1, N2 ..........................84

Test 40 – Check Battery Charger Supply

Voltage “Pre-Wire Load Center” ..........86

Test 41 – Check Battery Charger Output

Voltage “Pre-Wire Load Center” ..........86

Test 42 – Check Wire 0 and Wire15B

“Pre-Wire Load Center” .......................86

Test 43 – Check Battery Charger

Supply Voltage
“RTSN & RTSE Transfer Switch” .........87

Test 44 – Check Battery Charger

Output Voltage
“RTSN & RTSE Transfer Switch” .........87

Test 45 – Check Wire 0/

“RTSN & RTSE Transfer Switch” ........87

Test 46 – Check Battery Charger

Supply Voltage
“GenReady Load Center” ....................90

Test 47 – Check Battery Charger

Output Voltage
“GenReady Load Center” ....................90

Test 48 – Check Wire 0/15B

“GenReady Load Center” ....................90

Test 49 – Check Battery Charger

Supply Voltage
“Load Shed Transfer Switch” ...............92

Test 50 – Check Battery Charger

Output Voltage
“Load Shed Transfer Switch” ...............92

Test 51 – Check Wire 0 and Wire 15B

“Load Shed Transfer Switch” ...............94

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