Lincoln Electric IM409 IDEALARC R3R-400 - Manual (Page 17)

D-5 TROUBLESHOOTING D-5
IDEALARC® R3R, -300, -400, -500
Observe all Safety Guidelines detailed througout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local
Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
FUNCTION PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Machine trips off when under no
load or makes excessive noise like
it is loaded.
Variable or sluggish welding arc.
Welder will not shut off.
115VAC Receptacle not working.
1. Power bridge rectifier may have
a shorted diode or SCR.
2. Short in the transformer.
3. Fan hitting vertical baffle.
1. Poor work or electrode cable
connection.
2. Current too low.
3. Welding leads too small.
4. Open SCR or diode in power
rectifier bridge.
5. Control circuit problems.
1. Input contactor contacts frozen.
1. Circuit Breaker Tripped.
2. Defective Cicuit Breaker.
3. Broken connectionin wiring.
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field Service Facility.