User manual

-- 4 8 --
dha2d1ea
7 FAULT TRACING
Equipment
S Instruction manual control box PEG 1, order no. 443 392.
Check
S that the power supply is connected for the correct mains supply
S that all three phases are supplying the correct voltage (phase se-
quence is not important)
S that welding cables and connections are not damaged
S that the controls are correctly set
S 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 irregu lar.
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 Weldin g 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