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TROUBLESHOOTING & REPAIR
F-7 F-7
IDEALARC R3R
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
216-383-2531 or 1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
The machine does not have maxi-
mum output.
1. Make sure the correct three-
phase input voltage is being
applied to the machine.
2. Make certain the Dial Control
Switch (SW3) is in the correct
position. (Not present on R3R
300).
3. If the remote control is being
used, set the Output Control
Switch (SW2) to the Machine or
Local position and control the
weld output with the machine
Output Control (R1). If the
problem is resolved, check the
remote control unit and associ-
ated cable leads. If the Pocket
Amptrol option is being used,
the Pocket Amptrol circuit may
be faulty.
1. Check the Output Control (R1).
Normal resistance is 10,000
ohms. Also check associated
wiring for loose or faulty con-
nections. See the Wiring
Diagram.
2. Check the Ouptut Control
Switch (S2) and associated
wiring. See the Wiring Diagram.
3. Perform the Main Transformer
Test.
4. Perform the SCR/Diode
Bridge Rectifier Test.
5. If the Pocket Amptrol is not
functioning properly, perform
the Pocket Amptrol Circuit
Test.
6. The control board may be
faulty. Replace.
The machine will not shut off when
the power switch is put in the OFF
position.
1. Make sure the three-phase
input lines are connected cor-
rectly to the R3R machine.
1. Check the Input Power Switch
(S1) and associated leads. See
the Wiring Diagram.
2. Perform the Input Contactor
Test.