Instruction manual

Revision date: 26.02.2013 Page 18 of 32
14 TROUBLESHOOTING
PROBLEM
CAUSE
SOLUTION
The machine
does not start.
− No current to the machine.
− Voltage reaches the
machine switch but there is
no voltage after the
contacts.
− There is voltage after the
switch but the machine
does not start
• Make sure that power is available at the socket you
plug in to and that the power supply cable is intact.
• Unplug the machine and make sure that when the
machine is switched on, there is contact between the
contact input and output and that the varistor is not
broken. If so the power board must be replaced (pic.5).
• Check the mosfet of the switching power supply unit
on the power board (picture 6).
The line fuses
blow when the
switch is
activated and
the machine
does start.
− Damaged primary cable
or plug
− Damaged inverter
Make sure that power is available at the socket you plug
in to and that the power supply cable is intact.
• Check:
- varistors (picture 5);
- inverter (picture 4);
- Input bridge rectifier (picture 3);
- switching power supply unit (picture 6).
If one of these components is damaged replace the
power board 050.0011.0001.
The front panel
is not activated.
− The fan works but the front
panel does not activate
− Both the fan and the front
panel do not work.
Unplug the machine. Make sure the flat cable that con-
nects the front panel to the power board is inserted
correctly. If correctly inserted, replace the front panel. If
the front panel does not activate, one of the switching
power supply unit outputs is broken. The power board
must be replaced.
• Check the mosfet of the switching power supply unit on
the power board. If it’s damaged it must be replaced
(picture 6).
The
MMA/MIG/TIG
output voltage
is about 11V but
the machine
does not weld.
− The output voltage wiring
of the front panel is
interrupted (picture 1).
− The primary current alarm
on the power board is
activated
• Unplug the machine
− Make sure that the wiring contact is correctly inserted
in the connector.
− Check for continuity between the +/- output outlets and
that the 2-path connector is connected to the front
panel (picture 1);
• The power board must be replaced
The output
voltage in each
mode is about
11V and
activating the
thermal
protection de-
vice.
Let the machine cool down. If
the machine continues
running with the protection
devices on, switch the
machine off and unplug the
machine. Remove the hood
and make sure the
temperature of the heat sink
part is less than 40°C;
If it is less than 40°C, check
that the thermal protective
device contacts are closed
as it should be.
- If one of the protection devices is permanently open it is
defective and must be replaced.
- If it is closed, make sure that the two terminals are well
inserted in the connector (picture 1).
- Power board feed problems, it must be replaced.
The machine is
dead except for
lit LED warning
light on the
back panel
Input voltage exceeds 285V
and the TP (total protection)
function has been activated
Nominal input voltage should be 230V. Welding power
will return automatically as soon as the input voltage has
been corrected.