Fronius Robacta MTG 3500 Instrucciones De Uso página 80

Troubleshooting
No welding current
Mains switch is ON, indicators on the power source are lit up, shielding gas available
Cause: Grounding (earthing) connection is incorrect
Remedy: Check the grounding (earthing) connection and terminal for correct polarity
Cause: Break in the current cable in the welding torch
Remedy: Change the welding torch
No protective gas shield
All other functions are OK
Cause: The gas cylinder is empty
Remedy: Change the gas cylinder
Cause: The gas pressure regulator is faulty
Remedy: Replace the gas pressure regulator
Cause: The gas hose is not connected, damaged or kinked
Remedy: Connect/replace the gas hose, or straighten out kinks
Cause: The welding torch is faulty
Remedy: Replace welding torch
Cause: Gas solenoid valve is faulty
Remedy: Replace gas solenoid valve
Poor welding properties
Cause: Incorrect welding parameters
Remedy: Check the settings
Cause: Poor grounding (earthing) connection
Remedy: Ensure good contact to workpiece
Cause: Inadequate protective gas shield, or none at all
Remedy: Check the pressure regulator, gas hose, gas solenoid valve and torch gas connection. On gas-
cooled welding torches, inspect the gas seals, use a suitable inner liner.
Cause: Welding torch is leaking
Remedy: Replace welding torch
Cause: Contact tube is too large or worn out
Remedy: Replace contact tube
Cause: Wrong wire alloy or wrong wire diameter
Remedy: Check the wire spool that has been inserted
Cause: Wrong wire alloy or wrong wire diameter
Remedy: Check weldability of the base material
Cause: The protective gas shield is not suitable for this wire alloy
Remedy: Use the correct protective gas shield
Cause: Unfavourable welding conditions: protective gas shield is contaminated (by moisture, air), inade-
quate gas shielding (weld pool „boiling", draughts), contaminants in the workpiece (rust, paint,
grease)
Remedy: Optimise the welding conditions
Cause: Welding spatter in the gas nozzle
Remedy: Remove the welding spatter
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