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POWER WAVE 355/405
TROUBLESHOOTING & REPAIR
F-7 F-7
Observe Safety Guidelines
TROUBLESHOOTING GUIDE
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 1-800-833-9353(WELD).
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FUNCTION PROBLEMS
The machine often “noodle welds”
with a particular procedure. The
output is limited to approximately
100 amps.
1. The machine may be trying to
deliver too much power. When
the average output current
exceeds a maximum limit, the
machine will “phase back” to
protect itself. Adjust the proce-
dure or reduce the load to lower
the current draw from the Power
Wave machine.
1. Perform the Current
Transducer Test.
2. The control board may be faulty.
Excessively long and erratic arc. 1. Check for proper configuration
and implementation of voltage
sensing circuits.
1. Check the connections between
the voltage sense receptacle
and the control board. See the
Wiring Diagram.
2. The control board may be faulty.