Problem 4 -Voltage And Frequency Drop Excessivelywhen Loads Are Applied; Prepackaged; Ac Generators - Guardian 4721 Repair Manual

SECTION 2.3
PREPACKAGED LIQUID
PART 2
COOLED AC GENERATORS
TROUBLESHOOTING FLOW CHARTS
Problem 4 - Voltage and Frequency Drop Excessively When Loads Are Applied
TEST 15 - CHECK
TEST 13 - CHECK AND
TEST 16 - CHECK
BOTH
VOL TAGE AND
NOT OVERLOADED
ADJUST GOVERNOR
FOR OVERLAOD
LOW
FREQUENCY
CONDITION BOARD AND
UNDER LOAD
STEPPER MOTOR
OVERLOADED
GOOD GOOD
REDUCE LOADS TO
UNIT'S RATED CAP ACITY
DISCONTINUE TESTING
GO TO SECTION 4.4
DIAGNOSTIC TESTS
TEST 20 - CHECK ENGINE
COMPRESSION AND CONDITION
ENGINE CONDITION GOOD
LOOK FOR A SHORTED
TEST 8 - CHECK
CONDITION IN A CONNECTED
GOOD
STA TOR AC
LOAD OR IN ONE OF THE LOAD
POWER WINDINGS
CIRCUITS
BAD
REPAIR OR REPLACE
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