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6 FAULT TRACING
6.1 General
Equipment
Instruction manual for PEK, 0460 948 xxx, 0460 949 xxx, 0459 839 036.
Check
that the power supply is connected for the correct mains supply
that all three phases are supplying the correct voltage
(phase sequence is not important)
that welding cables and connections are not damaged
that the controls are correctly set
that the mains supply is disconnected before starting repairs
6.2 Possible faults
1. Symptom Current and voltage readings show large fluctuations
Cause 1.1 Contact jaws or nozzle are worn or wrong size.
Action Replace contact jaws or nozzle.
Cause 1.2 Feed roller pressure is inadequate.
Action Increase pressure on feed rollers.
Cause 1.3 The gas nozzle is choked up.
Action Clear of welding spatter.
2. Symptom Wire feed is irregular
Cause 2.1 Pressure on feed rollers incorrectly set.
Action Adjust the pressure.
Cause 2.2 Feed rollers wrong size.
Action Replace feed rollers.
Cause 2.3 Grooves in feed rollers are worn.
Action Replace feed rollers.
3. Symptom Welding cables overheating
Cause 3.1 Poor electrical connection.
Action Clean and tighten all electrical connections.
Cause 3.2 Cross-sectional area of welding cables too small.
Action Use cables with a larger cross-section or use parallel cables.
GB
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