Problem 6 - Voltage & Frequency Are Both High Or Low; Problem 7 - Excessive Voltage/Frequency Droop When Load Is Applied; Problem 8 - Generator Produces High Voltage At No-Load - Generac Power Systems XT-EFI Series Manual

Section 2 Direct Excitation (Brush Type)
Problem 6 – Voltage & Frequency Are Both High or Low
TEST 29 – CHECK & ADJUST ENGINE
GOVERNOR, 220cc ENGINE
Problem 7 – Excessive Voltage/Frequency Droop When Load is Applied
TEST 10 – CHECK
LOAD VOLTAGE &
FREQUENCY
GOOD
END TEST
Problem 8 – Generator Produces High Voltage at No-Load
TEST 1 – CHECK
NO-LOAD VOLTAGE
AND FREQUENCY
TEST 12 – ADJUST
VOLTAGE
REGULATOR
FREQUENCY O.K.,
BUT VOLTAGE IS
STILL HIGH
8
BAD
TEST 29 – CHECK &
ADJUST ENGINE
GOVERNOR,
220/410/426cc
ENGINE
FREQUENCY
HIGH
FREQUENCY O.K.,
BUT VOLTAGE HIGH
REPLACE AUTOMATIC
VOLTAGE REGULATOR
FREQUENCY GOOD,
LOW OR RESIDUAL
VOLTAGE
NO-LOAD FREQUENCY &
VOLTAGE GOOD BUT THEY
DROOP TOO MUCH WHEN
LOAD IS APPLIED
FREQUENCY IS GOOD
BUT NO-LOAD
VOLTAGE IS HIGH
TEST 11 – CHECK
LOAD WATTS &
AMPERAGE
OVERLOADED
GOOD GO TO PROBLEM 23
TEST 29 – CHECK & ADJUST ENGINE
GOVERNOR, 220/410/426cc ENGINE
REPLACE
BAD
ALTERNATOR
RE-CHECK VOLTAGE
AT RECEPTACLE
GO TO
PROBLEM 5
GO TO
PROBLEM 7
GO TO PROBLEM 5,
TEST 12 – ADJUST
VOLTAGE
REGULATOR
NOT OVERLOADED
REDUCE LOAD
FREQUENCY AND
VOLTAGE O.K.
STOP
TESTS
GOOD
PANEL
Diagnostic Repair Manual