Fronius MTG 2500 S Instructions De Service page 39

Contact tip has a short service life
Cause: Incorrect wirefeeder rollers
Remedy: Use correct wirefeeder rollers
Cause: Wire electrode worn due to excessive contact pressure on the wirefeeder roll-
ers
Remedy: Reduce contact pressure on the wirefeeder rollers
Cause: Wire electrode contains impurities/is corroded
Remedy: Use high-quality wire electrode with no impurities
Cause: Uncoated wire electrode
Remedy: Use wire electrode with suitable coating
Cause: Wrong dimension of contact tip
Remedy: Use a contact tip of the correct dimension
Cause: Duty cycle of welding torch has been exceeded
Remedy: Shorten the duty cycle or use a more powerful welding torch
Cause: Contact tip has overheated. No thermal dissipation as the contact tip is too
loose
Remedy: Tighten the contact tip
NOTE! When using CrNi, the contact tip may be subject to a higher degree of
wear due to the nature of the surface of the CrNi wire electrode.
Torch trigger malfunction
Cause: Defective plug connection between welding torch and power source
Remedy: Establish proper plug connections / have power source or welding torch ser-
viced
Cause: Build up of dirt between torch trigger and torch trigger housing
Remedy: Clean away the dirt
Cause: Control line is faulty
Remedy: Contact After-Sales Service
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