Generac Power Systems 5410 User Manual

The  “Flow  Charts”  in  this  section  may  be  used  in 

conjunction  with  the “Diagnostic Tests”  of  Section  7. 

Numbered  tests  in  the  Flow  Charts  correspond  to 

identically numbered tests of Section 7.

Problems 1 through 4 apply to the AC generator only.
Beginning with Problem 5, the engine DC control sys-

tem is dealt with.

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VOLTAGE & 

FREQUENCY BOTH 

HIGH OR LOW

FREQUENCY GOOD – 

VOLTAGE HIGH

OR

VOLTAGE LOW

FREQUENCY GOOD – 

ZERO OR RESIDUAL 

VOLTAGE 

NO-LOAD VOLTAGE 

& FREQUENCY 

GOOD

TEST 1 – CHECK 

NO-LOAD VOLTAGE 

& FREQUENCY

GO TO PROBLEM 1

GO TO VOLTAGE 

REGULATOR ADUST-

MENT, PAGE xx

GO TO PROBLEM 2

GO TO PROBLEM 4

FREQUENCY GOOD. 

LOW OR RESIDUAL 

AC VOLTAGE

NO-LOAD FREQUENCY & 

VOLTAGE GOOD BUT THEY 

DROOP TO MUCH WHEN 

LOAD IS APPLIED

FREQUENCY IS GOOD BUT 

NO-LOAD VOLTAGE IS 

HIGH OR VOLTAGE IS LOW

TEST 2 – CHECK 

STEPPER MOTOR 

CONTROL

GO TO 

PROBLEM 2

GO TO 

PROBLEM 4

GO TO VOLTAGE 

REGULATOR 

ADJUSTMENT, 

PAGE 9