Lincoln Electric POWER WAVE 355/405 SVM159-A Service Manual page 49

F-7
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The machine often "noodle welds"
with a particular procedure.
output is limited to approximately
100 amps.
Excessively long and erratic arc.
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).
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
FUNCTION PROBLEMS
1. The machine may be trying to
The 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. Check for proper configuration
and implementation of voltage
sensing circuits.
CAUTION
POWER WAVE 355/405
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. Perform the
Transducer Test.
2. The control board may be faulty.
1. Check the connections between
the voltage sense receptacle
and the control board. See the
Wiring Diagram.
2. The control board may be faulty.
F-7
Current