TM-268 819 Page 10
Belt Driven Generator
SECTION 7 − TROUBLESHOOTING 4kW GENERATOR
7-1.
Troubleshooting Table
.
See Section 7-2 for test points and values and
Section 11 and following for parts location.
.
Use MILLER Testing Booklet (Part No. 150 853)
when servicing this unit.
.
To avoid charges that are not covered under warranty, troubleshoot and replace components as described. Warranty requests on equipment
that could have been repaired in the field or are misdiagnosed may be denied.
Inspect generator and repair or replace components or wiring that shown signs of physical damage.
Inspect stator winding for evidence of overheating. Do not return the generator unless indicated by the troubleshooting guide and factory au-
thorized service agent.
Do not return the control box.
Trouble
Remedy
No generator output at platform
receptacles.
Be sure generator control switch is turned on at platform.
Check and secure electrical connections at platform, generator, and control box.
Be sure all equipment is turned off when starting unit.
Check circuit breaker CB1 for loose terminals. Check continuity across poles of CB1. Reset or replace
CB1 (see Section 4-2).
Check connections at receptacle RC4 Be sure battery voltage is present (12 volts DC) to enable
control relay CR1.
Check control relay CR1: Check all connections, check coil continuity, check for proper coil voltage, and
check contact voltage (input to common and output to common) to ensure contacts are operating. Re-
place CR1 if indicated.
Disconnect stator leads 1, 4, and 90 (if applicable) from circuit breaker CB1, and check continuity bet-
ween leads. Replace generator if indicated.
Check capacitor C1 and replace if indicated.
Excitation of field lost. Flash field according to Section 7-2.
Low generator output at platform
receptacles.
Verify generator is running at 3600 rpm for 60 Hz, 3000 rpm for 50 Hz.
Disconnect stator leads 1, 4, and 90 (if applicable) from circuit breaker CB1, and check continuity bet-
ween leads. Replace generator if indicated.
Check capacitor C1 and replace if indicated.
High generator output at platform
receptacles.
Verify generator is running at 3600 rpm. for 60 Hz, 3000 rpm for 50 Hz.
Erratic generator output at platform
receptacles.
Check and secure electrical connections at platform, generator, and control box.
Verify generator is running at 3600 rpm. for 60 Hz, 3000 rpm for 50 Hz
Check circuit breaker CB1 for loose terminals. Check continuity across poles of CB1. Reset or replace
CB1 (see Section 4-2).
