Troubleshooting Flowcharts; If Problem Involves Ac Output (Brush Type); Problem 5 - Generator Produces Zero Voltage Or Residual Voltage - Generac Power Systems XT-EFI Series Manual

Troubleshooting Flowcharts

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.

If Problem Involves AC Output (Brush Type)

VOLTAGE &
FREQUENCY BOTH
HIGH OR LOW
GO TO PROBLEM 6
Problem 5 – Generator Produces Zero Voltage or Residual Voltage
TEST 2 – CHECK
MAIN CIRCUIT ON
BREAKER
RESET TO "ON"
OR REPLACE IF BAD
Diagnostic Repair Manual
AC Diagnostic Tests
AC Diagnostic Tests . The first step in using the flow charts is to identify the correct problem
TEST 1 - CHECK
NO LOAD VOLTAGE
& FREQUENCY
FREQUENCY GOOD FREQUENCY GOOD,
VOLTAGE HIGH LOW OR RESIDUAL
GO TO PROBLEM 8 GO TO PROBLEM 5
TEST 13 –
TEST 120/240 ON
CHANGEOVER
SWITCH
(IF EQUIPPED)
BAD
REPLACE SWITCH
REPLACE
ALTERNATOR
. Test numbers used in the flow charts correspond to
p
ZERO VOLTAGE
ZERO FREQUENCY
VOLTAGE
VERIFY ROTOR IS SPINNING,
GO TO PROBLEM 5
TEST 3 – CHECK
CONTINUITY OF
GOOD
RECEPTACLE PANEL
BAD
REPLACE COMPONENT
AS NEEDED
RE-CHECK VOLTAGE
AT RECEPTACLE
BAD
PANEL
GOOD
STOP TESTING
Section 2 Direct Excitation (Brush Type)
NO LOAD VOLTAGE &
FREQUENCY GOOD -
VOLTAGE/FREQUENCY
FALLS OFF UNDER LOAD
GO TO PROBLEM 7
TEST 4 – FIXED
EXCITATION
TEST/ROTOR AMP
DRAW TEST
REPLACE COMPONENT
GOOD
REPLACE AUTOMATIC
VOLTAGE REGULATOR
BAD
AS NEEDED
7