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10 to 12V = (ARC or
TIG)
In TIG position
Trigger = 1
Pregas
Starting / welding
Selector
Sloping down
160
PRESTOPAC
Voltage > standby
voltage
No gas
Starting impossible or
current not adjustable
No sloping down
Primary module
Secondary module
Control board
Primary module
Fuse defective
Connections defective
Solenoid valve defective
Regulation system
Faulty connections
Control board
Potentiometer
Primary module
ARC/TIG selector
Regulation board
E - RICERCA GUASTI
FAULT-FINDING PROCEDURE
+ 15V between 10 & 11
on B5
— 15V between 9 & 10
on B5
Contact your dealer
Same steps as for nul
voltage (see above)
Contact your dealer
Check fuse
Disconnect the set, shunt
trigger terminals and
check continuity R=0
between 5 and 6 on B3.
Trigger = 1
Check for 220V at
solenoid valve terminals.
Trigger = 1
Check electrical
continuity between 5 and
6 of B4.
With electrode/
workpiece short-
circuited, reading should
be : Iw = 8 to 10A
If Iw = 0 , check control
board
If Iw ≥ 10A, check control
board
Measure :
+ 15V between 10 & 11
on B5
— 15V between 9 & 10
on B5
Check the potentiometer
wiring and condition
Contact your dealer
Switch off set.
Selector in position
Check on an ohmmeter
R=0 between 6 and 7 of
B5
Measure:
A
-26
E
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