Troubleshooting Flowcharts; If Problem Involves Ac Output (Brush Type); Problem 5 - Generator Produces Zero Voltage Or Residual Voltage; Problem 6 - Voltage & Frequency Are Both High Or Low - DeWalt DXGN4500 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
BREAKER
RESET TO "ON"
OR REPLACE IF BAD
REPLACE
ALTERNATOR
Problem 6 – Voltage & Frequency Are Both High or Low
Diagnostic Repair Manual
AC Diagnostic Tests
AC Diagnostic Tests . The first step in using the flow charts is to identify the correct problem
NO LOAD VOLTAGE
FREQUENCY GOOD FREQUENCY GOOD,
VOLTAGE HIGH LOW OR RESIDUAL
GO TO PROBLEM 8 GO TO PROBLEM 5
TEST 3 – CHECK
CONTINUITY OF
ON
RECEPTACLE PANEL
BAD
REPLACE COMPONENT
AS NEEDED
RE-CHECK VOLTAGE
AT RECEPTACLE
BAD
PANEL
GOOD
STOP TESTING
. Test numbers used in the flow charts correspond to
TEST 1 - CHECK
& FREQUENCY
ZERO FREQUENCY
VOLTAGE
VERIFY ROTOR IS SPINNING,
GO TO PROBLEM 5
GOOD
REPLACE AUTOMATIC
VOLTAGE REGULATOR
Section 2 Direct Excitation (Brush Type)
ZERO VOLTAGE NO LOAD VOLTAGE &
FREQUENCY GOOD -
VOLTAGE/FREQUENCY
FALLS OFF UNDER LOAD
GO TO PROBLEM 7
TEST 4 – FIXED
EXCITATION
BAD
TEST/ROTOR AMP
DRAW TEST
REPLACE COMPONENT
GOOD
AS NEEDED
13