Generac Power Systems GP Series Diagnostic Repair Manual page 29

AC Troubleshooting Flowcharts
Section 3
Introduction
Use the Flow Charts in conjunction with the
the numbered tests in the
on the following pages. For best results, perform all tests in the exact sequence shown in the flow charts.
Problem 1 – If Problem Involves AC Output
TEST 1 - CHECK
NO LOAD VOLTAGE
& FREQUENCY
Problem 2 – Generator Produces Zero Voltage or Residual Voltage
Diagnostic Repair Manual
AC Diagnostic Tests
AC Diagnostic Tests . The first step in using the flow charts is to identify the correct problem
FREQUENCY BOTH
HIGH OR LOW
FREQUENCY GOOD
VOLTAGE HIGH
FREQUENCY GOOD
LOW OR RESIDUAL
ZERO VOLTAGE
ZERO FREQUENCY
NO LOAD VOLTAGE &
FREQUENCY GOOD -
VOLTAGE/FREQUENCY
FALLS OFF UNDER LOAD
TEST 2 – CHECK
MAIN CIRCUIT
TEST 5 – CHECK
CONTINUITY OF
RECEPTACLE PANEL
TEST 4 – FIXED
EXCITATION TEST/ROTOR
AMP DRAW TEST
. Test numbers used in the flow charts correspond to
VOLTAGE &
VOLTAGE
BREAKER
GO TO PROBLEM 3
GO TO PROBLEM 5
GO TO PROBLEM 2
VERIFY ROTOR IS
SPINNING, GO TO
PROBLEM 2
GO TO PROBLEM 4
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