Generac Power Systems 8 kW LP - Manual (Page 57)

Part 3
traNsfEr
sWitcH
air-cooled, automatic
standby Generators
Page 55
3.1 Description and Components ...............................................56
General 5 6
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
taBlE of coNtENts
Part titlE PG#
3.1. Description and components 50
3.2 operational analysis 54
3.3 troubleshooting flow charts 64
3.4 Diagnostic tests 66