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6
TROUBLESHOOTING
Equipment
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Instruction manual control box A2--A6 Process Controller (PEH).
Check
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that the power supply is connected for the correct mains supply
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that all three phases are supplying the correct voltage (phase se-
quence is not important)
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that welding cables and connections are not damaged
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that the controls are correctly set
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that the mains supply is disconnected before starting repairs
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.
2. Symptom
Wire feed is irregular.
Cause 2.1
Pressure on feed rollers incorrectly set.
Action
Adjust pressure on feed rollers.
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.
7
ORDERING OF SPARE PARTS
Spare parts are ordered through your nearest ESAB representative, see back cover.
When ordering spare parts, please state machine type and number as well as desig-
nation and spare part number as shown in the spare parts list on page 33.
This will simplify dispatch and ensure you get the right part.
GB
