8 EN
DIAGNOSIS CHART
EN
10.0
DIAGNOSIS CHART
SERVICING OPERATIONS CARRIED OUT ON ELECTRIC IN-
STALLATIONS MUST BE PERFORMED BY PERSONS QUAL-
I F I E D T O D O T H I S K I N D O F W O R K ( S E E S A F E T Y
RECOMMENDATIONS SECTION).
FOR ANY SERVICING OPERATIONS INTERNAL TO THE
POWER-SOURCE OUTSIDE THE POINTS MENTIONED PRE-
VIOUSLY: CALL IN A TECHNICIAN
Power the welding set up
Turn button of front panel on 2t
Turn button of front panel on 4t
Following test - press on trigger
Turn button of front panel on ON
Turn button of front panel on OFF
Following test - press on trigger
Turn button of front panel on MIX
Turn button of front panel on CO2
Following test - press on trigger
Turn button of front panel on SOLID W
Turn button of front panel on FCW
Following test - press on trigger
Turn button of front panel on FE
Turn button of front panel on INOX
Turn button of front panel on ALU
Following test - press on trigger
Turn button of front panel on 0.8
Turn button of front panel on 1.0
Turn button of front panel on 1.2
Turn button of front panel on 1.6
Turn button of front panel on 2.4
Following test - press on trigger
Pre-gas adjustment: from 0 to 10s
To change this adjustment: turn the potentiometer PREGAZ
on electronic card (manufacturer adjustment = 0s)
Following test - press on trigger
Burn back adjustment: from 0 to 100
To change this adjustment: turn the potentiometer PR on
electronic card (manufacturer adjustment = 7)
Following test - press on trigger
Post-gas adjustment: from 0 to 10s
To change this adjustment: turn the potentiometer POST-
GAS on electronic card (manufacturer adjustment = 0)
Following test - press on trigger
Adjustment of striking voltage: from -4 to +6
To change this adjustment: turn the potentiometer P4 on
electronic card (manufacturer adjustment = 0)
Following test - press on trigger
Test of display
End of self-test
CAUSES
SOLUTIONS
NO WIRE-FEED WHEN PRESSING THE T DEFECT LIGHT OFF
Defective torch
- change the torch
- shunt wires 306 and 307 of B9 connector if opera-
tion OK - change the torch socket
Connection
- if not OK - check connections
Electronic card
- if not OK - change the card
ABSENCE OF NO-LOAD VOLTAGE WHEN PRESSING THE TRIGGER
+ DEFECT LIGHT OFF
Transformer
- press trigger and check voltages p 50V (AC) on
wires: 10 and 20 / 20 and 30 / 10 and 30
- check voltage 50V between : 50 and 52 / 50 and
54 / 52 and 54 if OK, check voltage 36VDC on PD1
bridge output, else change the bridge PD1
Rectifier bridge
- check voltages c 28V (AC) on wires : 61 and 60 /
63 and 60 / 60 and 65
- check 18VAC between: 60 and 64 / 60 and 66
- test the rectifier bridge
Electronic card
- change the card
ABSENCE OF NO-LOAD VOLTAGE
+ NO WIRE-FEED WHEN PRESSING THE T DEFECT LIGHT ON
Overload voltage
- let the power source cooling till light goes off
Thermal safety (TH1/TH2)
- shunt wires 320 and 42J:
- if the light goes off, change the TH1/TH2
Electronic card
- otherwise, change the card
INSTABILITY DURING WELDING
Poor adjustment
- set button Us of wire-feed unit on middle position
and check the place of front panel elements
Defective contactor
- operating on 2t, check, by pressing the trigger, that
the contactor is activated
Defective diode bridge
- press the trigger and check the 36V DC voltage on
the outputs of the bridge
