Fronius VARIOSTAR 357 Mode D'emploi page 35

Irregular wirefeed; the welding wire forms
a loop between the feed rollers and the
wire inlet nozzle of the welding torch
Wirefeeder motor is not running, or cannot
be controlled properly
'Ready' indicator is lit up
Wire electrode sticks to the contact tube
or weld pool
Torch body and hosepack become very
hot
Cooling-unit pump is not running
Insufficient cooling power
High-pitched running noises from cooling-
unit pump
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No gas
A phase is missing on the welding transformer
Secondary rectifier is defective
Wirespool brake is too tight
Bore of contact tube is too narrow
Wire inner liner in torch is faulty
Wirefeed rollers are not suitable for the welding
wire being used
Wirefeed rollers have wrong contact pressure
Quality of welding wire is not OK
Internal machine fault
Fuse F1, F2, F3 or F7 faulty
Wirefeeder motor is faulty
Wirefeeder controller is faulty
On 2-part version: Break in interconnecting
cable
Internal machine fault
Burn-back time correction dial is not set to
optimum value
Design dimensions of torch are not sufficient for
this task
On water-cooled machines: Coolant flow rate is
too low
No supply voltage
Cooling-unit pump is faulty
Fan is faulty
Cooling-unit pump is faulty
Coolant level is too low
Constriction or foreign body in the coolant circuit
Coolant level is too low
Cooling-unit pump is faulty
17
Check the pressure regulator (gas flow rate),
gas hose (connections), gas solenoid valve,
torch gas connection etc.
Check the mains supply lead, main switch and
contactor
Check the rectifier
Loosen brake-adjustment screw
Use the right contact tube
Check the inner liner for kinks,correct internal
diameter, length, soiling etc.
Use suitable wirefeed rollers for the welding-
wire in question
Optimise the contact pressure
Change the welding wire
Contact After-Sale Service
Check the fuses
Change the wirefeeder motor
Change the wirefeeder controller
Check that the interconnecting cable is con-
nected up properly
Contact After-Sale Service
Correct the burn-back time
Respect the duty cycle and loading limits
Check the coolant level, the flow rate and the
cleanliness of the coolant
Check the supply voltage
Replace the pump
Change the fan
Change the pump
Top up with more coolant
Eliminate the constriction
Top up with more coolant
Replace the pump