Fronius MTG 400i K4 Manual De Instrucciones página 45

Poor wirefeeding
Cause: Depending on the system, brakes in the wirefeeder or power source set too
tightly
Remedy: Set the brakes to be looser
Cause: Hole in the contact tip displaced
Remedy: Replace contact tip
Cause: Faulty inner liner or wire-guide insert
Remedy: Check inner liner or wire-guide insert for kinks, soiling, etc.
Replace faulty inner liner or wire-guide insert
Cause: Feed rollers not suitable for wire electrode used
Remedy: Use suitable feed rollers
Cause: Incorrect contact pressure of the feed rollers
Remedy: Optimize contact pressure
Cause: Feed rollers soiled or damaged
Remedy: Clean or replace feed rollers
Cause: Inner liner displaced or kinked
Remedy: Replace inner liner
Cause: Inner liner too short after cutting to length
Remedy: Replace inner liner and cut new inner liner to correct length
Cause: Wear of the wire electrode due to excessive contact pressure from the feed
rollers
Remedy: Reduce contact pressure from the feed rollers
Cause: Wire electrode soiled or rusted
Remedy: Use high-quality wire electrode without soiling
Cause: For steel inner liners: use of uncoated inner liner
Remedy: Use a coated inner liner
Gas nozzle gets very hot
Cause: No heat dissipation due to gas nozzle being fitted too loosely
Remedy: Screw the gas nozzle tightly up to the stop
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