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PART 3
TRANSFER
SWITCH
Air-cooled, Automatic
Standby Generators
Page 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
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