Standby During Exercise Or In Manual Mode With Utility Available; Utility Power Is Available; Problem 9 - Blown F1 Or F2 Fuse; Problem 10 - Blown T1 Fuse - Generac Power Systems 7 kW NG Repair Manual

Section 3.3
Troubleshooting Flowcharts
Problem 7 – In Automatic Mode, Generator Starts When Loss of Utility Occurs, Generator
Shuts Down When Utility Returns But There Is No Retransfer To Utility Power
Generator Transfers to Standby During Excercise or in Manual Mode
TEST 21 – CHECK
MANUAL TRANSFER
SWITCH OPERATION
GOOD
TEST 25 – CHECK
WIRE 23
GOOD
TEST 23 – TEST
TRANSFER
RELAY
GOOD
TEST 26 – CHECK
UTILITY CONTROL
CIRCUIT
Problem 8 – Unit Starts and Transfer Occurs When Utility Power Is On
TEST 33 –
CHECK N1 & N2
GOOD
VOLTAGE
BAD
TEST 28 –
CHECK FUSE GOOD
F1 & F2
BAD
REPLACE
GO TO PROBLEM 6
Page 74
OR
BAD REPAIR OR REPLACE MECHANISM
BAD REPAIR OR REPLACE AS NEEDED
REPLACE
BAD
REPAIR OR REPLACE AS NEEDED
BAD
TEST 34 – CHECK
UTILITY SENSE
VOLTAGE
TEST 35 –
CHECK VOLTAGE
AT TERMINAL
LUGS N1 & N2
GOOD
REPAIR OR REPLACE WIRE
N1A/N2A BETWEEN N1/N2
LUGS AND FUSE HOLDER
PART 3
BAD
REPLACE CONTROLLER
REPAIR N1/N2 OPEN WIRING
BETWEEN TRANSFER
GOOD
SWITCH AND GENERATOR
CORRECT UTILITY
BAD
SOURCE VOLTAGE
TRANSFER SWITCH