Lincoln Electric BIG RED 500 Service Manual page 85

F-9
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The welding arc is weak and or
erratic.
When in the "Stick" mode getting
the arc started is difficult.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely,
contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
TROUBLESHOOTING AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
WELDING PROBLEMS
1. Check the welding cables for
loose or faulty connections.
2. Make sure the electrode being
used is correct for the process.
1. Make sure the Stick/Tig switch
is in the Stick position and
functioning correctly. See the
Wiring Diagram.
CAUTION
BIG RED
1. Perform the Weld Rotor Test.
2. Check the Output Range
Switch
connections. See the Wiring
Diagram.
3. Check the Output Reactor for
"opens".
4. Check the heavy current
carrying output leads, between
the output terminals and the
three phase rectifier bridge, for
loose or faulty connections.
See the Wiring Diagram.
5. Perform the Three Phase
Output Rectifier Test.
1. Check the Hot Start Relay
(CR4).
receiving 12VDC on the relay
coil and the contacts are
closing.
Diagram.
2. Check the Hot Start Diode
Bridge (D4) and associated
chokes.
Diagram.
3. With the engine running at
1890RPM
presence of 65VAC at leads
#206 to #207. See the Wiring
Diagram.
® 500/600
RECOMMENDED
COURSE OF ACTION
and associated
Make sure it is
See the Wiring
See the Wiring
check for the
F-9