Generac Power Systems 53187 User Manual
Page 40
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SECTION 1.7- TROUBLESHOOTING
(UNITS WITH 10 INCH STATOR)
1
PARTI
THE REVOLVING FIELD AC GENERATOR
Problem 2- Generator Produces Low Voltage at No-Load
(Voltage Is Greater Than Residual)
DATU
TCOTiC. AnillOT
RTHP
1 CO 1 1H*
AC VOLTAGE
AND FREQUENCY
« ARE-^
LOW
1 CO 1 1 9* 1
ENGINE
GOVERNOR
ARE BOTH O.K. NOW
TESTS
FREQUENCY IS O.K.
BUT VOLTAGE IS
LOW
FREQUENCY IS NOW O.K.
BUT VOLTAGE IS STILL
LOW
I_________
TCQT a. nn A
r*'
FIXED
EXCITATION
TEST
AC OUTPUT
IS ABOUT 40-60”/.
OF RATED
VOLTAGE
AC OUTPUT IS LESS THAN
40”/. OF RATED VOLTAGE
BAD
i
BAD
i
TEST 12-CHECK
TEST 11-CHECK
TEST 10-TEST
TEST 13- TEST
WIRES NO. 1 AND
4
—O.K..^
BRUSHES AND
SLIP RINGS
i^O.K.»^
ROTOR
ASSEMBLY
».O.K.-^
STATOR AC
POWER
WINDINGS
RECONNECT, REPAIR
OR REPLACE BAD
WIRE(S)
REPLACE BAD BRUSHES
CLEAN SLIP RINGS
BAD
i
REPLACE BAD ROTOR
BAD
i
REPLACE
STATOR
ASSEMBLY
BAD
i
TEST 7- TEST
STATOR
EXCrrATION
WINDING
ITEST 16-CHECK 1
TEST 9- CHECK
VOLTAGE
REGULATOR
1 AND 6 1
b
I
d
i
VOLTAGE IS STILL LOW
REPLACE
STATOR
ASSEMBLY
RECONNECT, REPAIR OR
REPLACE WIRE(S)
AS REQUIRED
I
REPLACE VOLTAGE REGULATOR
TEST AND ADJUST
PAGE 1.7-2