8
Operating problems, causes and remedies
8/3
8.1.3
Customer checklist (
inverter
TIG 250 und 300 DC
)
Switch on the machine
(at the mains switch (Kap. 2, A)
Yes
Machine functioning
No
•
Mains supply broken
•
Mains plug not inserted
•
Mains fuse faulty
•
Mains power switch faulty
•
Mains plug wrongly connected
Yes
Press torch trigger
Yes
Green LED lights (Kap. 3, H1)
power unit / "on"
No
•
Torch connection incorrect (check torch
lead according to circuit diagram)
•
Torch control cable not inserted
•
Torch or torch trigger faulty
Yes
Shielding gas is expelled
No
•
No shielding gas connected
•
Pressure reducer turned off
Yes
Open circuit voltage
No
•
Test switch (Kap. 3, J1) in „test“ position
(Option)
•
yellow LED (Kap. 3, I1) excess temperature
lights (allow machine to cool down)
Yes
HF is applied
No
•
HF toggle switch on Lift-Arc ignition
Yes
Welding current
No
•
Welding torch faulty
•
Workpiece lead connected
•
Workpiece lead in wrong socket
Yes
Good welding properties
No
•
Leaky shielding gas supply
•
Welding torch damaged
•
Tungsten electrode contaminated
•
insufficient or excessive shielding gas
Yes
Remote control functions
No
•
Remote control plug not inserted in the
machine
•
Remote control or cable defective
