Problem 1 - Generator Produces Zerovoltage Or Residualvoltage; Prepackaged; Ac Generators - Guardian 4721 Repair Manual

SECTION 2.3
TROUBLESHOOTING FLOW CHARTS
Use the "Flow Charts" in conjunction with the detailed
instructions in Section 2.4. Test numbers used in the
flow charts correspond to the numbered tests in
Section 2.4.
Problem 1 - Generator Produces Zero Voltage or Residual Voltage
TEST 1 - CHECK
MAIN CIRCUIT
BREAKER
RESET TO
"ON"
OR REPLACE
IF BAD
TEST 6 - WIRE
CONTINUITY
BAD
GOOD
TEST 7 -
FIELD BOOST
BAD
REPAIR
OR
REPLACE
THEN
GOOD
RETEST
REPLACE
VOLTAGE
REGULATOR
Page 26
TEST 3 - TEST
EXCITATION
CIRCUIT BREAKER
TEST 5 -
A PERFORM FIXED
EXCITATION /
ROTOR AMP
DRAW
D
B
C
TEST 8 -TEST
GOOD
STATOR
PERFORM STATOR
BAD
RESISTANCE TEST
REPAIR
OR
REPLACE
PART 2
The first step in using the flow charts is to correctly
identify the problem. Once that has been done, locate
the problem on the following pages. For best results,
perform all tests in the exact sequence shown in the
flow charts.
GOOD -PROCEED
BAD -PROCEED, REPLACE AFTER TESTS
CONCLUDE
G
CIRCUIT
INSULATION
BAD
REPAIR
OR
REPLACE
PREPACKAGED LIQUID
COOLED AC GENERATORS
TEST 4 - TEST
RE-TEST
REPAIR
OR REPLACE
FUSES
CHECK
VOM
FUSES
TEST 9 -
CHECK
GOOD
ROTOR
BAD
TEST 10 -
CHECK
BAD
BRUSHES &
SLIP RINGS
GOOD
TEST 11 -
TEST ROTOR
BAD
ASSEMBLY
GOOD
PERFORM ROTOR
INSULATION
BAD
RESISTANCE TEST
THERMAL
PROTECTOR