Lincoln Electric IDEALARC R3R-300 Service Manual page 39

F-5
TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
The machine is dead – no output –
no fan. The input contactor does
not operate. The amber thermal
protection light is on.
light is on.
The input contactor (CR1) chatters.
The machine has high welding out-
put and no control.
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.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. If the amber thermal protection
light is on, the primary or sec-
ondary thermostat is open.
The pilot Allow the machine to cool.
Check the fan motor for proper
operation. Make sure all case
openings are free for proper cir-
culation of air.
machine at rated current and
duty cycle.
1. Make certain the three-phase
input voltage matches the rat-
ing plate and the reconnect
panel.
1. 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).
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.
CAUTION
IDEALARC R3R
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. Check the leads and connec-
tions between the thermostats,
the input contactor (1CR) and
the power switch (SW1). See
the Wiring Diagram.
2. One of the (normally closed)
thermostats may be faulty.
Operate the
1. Perform the Input Contactor
Test.
1. Check the Output Control
Switch (SW2) and the Dial
Selector Switch (SW3) and
associated wiring.
Wiring Diagram.
If the
2. Check the feedback leads
#205, #206, #204 and #225 for
loose or faulty connections.
3. Perform
Rectifier Bridge Test.
4. If the Pocket Amptrol is not
functioning properly, perform
the Pocket Amptrol Circuit
Test.
5. The control board may be
faulty. Replace.
F-5
See the
the SCR/Diode