Saf-Fro PRESTO 140 PFC Instruction De Securite D'emploi Et D'entretien page 6

EN
TYPES OF MALFUNCTIONING / WELDING FAULTS – CAUSES – REMEDIES
Carry out the following operations every three (3) months:
a. Replace any illegible labels.
b. Clean and tighten the welding terminals.
c. Repair or replace damaged welding cables.
d. Have specialized personnel replace the power cable if
damaged.
TYPES OF MALFUNCTIONING
WELDING FAULTS
The generator does not weld.
During welding suddenly the outgoing current is
interrupted, the green led is off and the yellow
led goes on.
Welding power reduced.
Excessive jets.
Craters.
Inclusions.
Inadequate penetration.
Sticking.
Blowing and porosity.
Jacks.
The electrode fuses in TIG.
All manuals and user guides at all-guides.com
Carry out the following operations every six (6) months:
Remove any dust inside the generator using a jet of dry air.
Carry out this operation more frequently when working in very
dusty places.
5.0
POSSIBLE CAUSES
A) The main switch is off.
B) The power lead is interrupted (lack of one or
two phases).
C) Other.
Overheating has occurred and the automatic pro-
tection has come on. (See work cycles).
Outgoing wires are not correctly attached.
A phase is missing.
Welding arch too long.
Welding current too high.
Fast removal of the electrodes.
Inadequate cleaning and bad distribution of coating.
Faulty movement of the electrodes.
Forward speed too high. Welding current too low.
Welding arch too short.
Current too low.
Damp electrodes. Arch too long. Wrong torch polarity.
Currents too high. Dirty materials.
Wrong torch polarity. Type of gas not suitable.
5 EN
TYPES OF MALFUNCTIONING / WELDING
FAULTS – CAUSES – REMEDIES
CONTROLS AND REMEDIES
A) Switch on mains.
B) Verify and repair.
C) Ask for the intervention of the Assistance Centre.
Keep generator switched on and wait till temperature
has dropped again (10-15 minutes) to the point where
the yellow switch goes off again.
Check that wires are intact, that the pliers are suffi-
cient and that they are applied to welding surface
clean from rust, paint or oils.
Wrong torch polarity, lower the current values.
Increase current values.