Lincoln Electric IM409 IDEALARC R3R-400 - Manual (Page 15)

D-3 TROUBLESHOOTING D-3
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 input contactor closes but
has no or low output. Open circuit
voltage should be 67 to 71 volts.
Machine has maximum output but
no control.
1. Electrode or work lead loose or
broken.
2. Open transformer primary or
secondary circuit.
3. Supply line fuse blown.
4. Input line grounded causing
single phase input.
5. Input leads not connected to
contactor.
6. Latching resistor, R3, open.
7. Control circuit problems.
1. Possible defective power SCR.
2. Possible defective control board.
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field Service Facility.