Part 3 - Transfer Switch - Generac Power Systems CorePower Repair Manual

PART 3 – Transfer Switch ..................................................37
Section 3.1 – Description and Components ....................... 38
General ................................................................. 38
Enclosure ............................................................. 38
EZ Transfer Operator ............................................. 38
Fuse Holder .......................................................... 38
Section 3.2 – Operational Analysis .................................... 39
Utility Voltage Present ........................................... 39
Transfer to Standby ............................................... 39
Transfer to Utility ................................................... 39
Section 3.3 – Troubleshooting Flowcharts ......................... 41
Introduction .......................................................... 41
Problem 10 – In Automatic Mode,
No Transfer to Standby ......................................... 41
Problem 11 – 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 ...... 41
Problem 12 – Blown F1 or F2 Fuse ........................ 42
Problem 13 – Blown T1 Fuse ................................ 42
Problem 14 – Unit Starts and Transfer Occurs
When Utility Power is On ....................................... 42
PART 3
TRANSFER SWITCH
Section 3.4 – Diagnostic Tests .......................................... 43
Introduction .......................................................... 43
Safety ................................................................... 43
Transfer Switch Troubleshooting .......................... 43
Test 27 – Check Generator Voltage at
Transfer Switch ...................................... 43
Test 28 – Test Transfer Operator ............................ 43
Test 29 – Check 15B/194 Circuit .......................... 43
Test 30 – Check Wire 23 Circuit ............................ 44
Test 32 – Check Fuses F1 and F2 .......................... 44
Test 33 – Check N1 and N2 Wiring ........................ 45
Test 35 – Check Fuse F3 ...................................... 45
Test 36 – Check T1 Wiring .................................... 45
Test 38 – Check N1 and N2 Voltage ...................... 46
Test 39 – Check Utility Sense Voltage .................... 46
Test 40 – Check Utility Voltage at Transfer Switch .. 46
Test 41 – Check Utility Sensing Voltage
at the Controller ..................................... 46
Page 37