Troubleshooting
The machine may be repaired only by an authorized and licensed technician or workshop!
First do a visual check to find the possible loose connectors, broken wires or signs of overheating.
Also check the condition of the welding cables, welding guns / torches and all consumable parts.
DISTURBANCE POSSIBLE CAUSE REMEDY
The power source will not start.
MMA open circuit voltage is 0 V
Net fuses have blown
Faulty supply cable
Faulty main switch
Faulty current adjustment
potentiometer
Faulty local / remote control
selection switch (2200-3500)
Faulty auxiliary transformer
Faulty primary side power
semiconductor
Faulty control card A001
Faulty control card A002
(Mastertig)
Faulty flat cable between
control cards A001 and A002
Check the net fuses
Check the supply cable condition
Check the main switch condition
Check the potentiometer condition
Check the control method selection
switch condition
Check the auxiliary transformer
condition
Check the condition of the primary
rectifier and the IGBT-module
Check the control card A001
condition (see page 27)
Check the control card A002
condition (see pages 28 and 29)
Check the flat cable condition
(see page 23)
Faulty primary side power
semiconductor
Faulty main circuit card
Faulty secondary unit
Check the condition of the primary
rectifier and IGBT-module
Check the condition of the
smoothing and load capacitors.
Look for possible signs of
insulation damages on main circuit
card.
Check the secondary diodes
condition.
The net fuses blow during
startup.
Note! 1-phase Master- and Mastertig-power sources may blow net fuses
during the first startup, without being anything wrong in the power source. This
is because the DC-link capacitors have relatively high charging current! This
phenomenon is found especially with automatic fuses.
Troubleshooting diagram
18
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