60
A7 MIG Welder
© Kemppi Oy 2017
1735
OPERA
TING M
ANU
AL
6. OPERATION DISTURBANCES
Should you experience a malfunction from your machine,
please consult the basic troubleshooting text above first,
and complete some basic checks.
If the machine malfunction cannot be corrected with
these measures, contact your Kemppi maintenance
service workshop.
Operation of the overload protection
Yellow thermal protection lamp is lit when the thermostat
is operating, due to loading beyond the stated duty cycle.
The thermostat will operate, if machine is continuously
loaded over rated values or cooling air circulation is
blocked.
Internal fans will cool the machine, and when the pilot
lamp is not lit the machine is automatically ready for
welding.
Control fuses
Fuse, 6.3 A delayed, on the rear wall of the machine
provides protection for auxiliary devices.
Use the same type and rating of fuse as marked beside the
fuse adapter. Damage caused by incorrect fuse selection is
not covered by the guarantee.
Under- and overvoltages in the mains supply
Primary circuits of the machine are protected against
sudden, transient overvoltage. The machine is designed
to withstand 3 x 440 V voltage continuously. Ensure that
voltage is kept within this permissible limit, especially
when the mains supply is provided by a combustion
engine generator. If the mains have undervoltage (under
approx. 300 V) or overvoltage (over approx. 480 V) machine
control stops operation automatically.
Loss of a phase in the mains supply
Loss of a mains power phase causes noticeably poor
welding properties. In some cases, the machine won't
start at all. Loss of a phase can be due to following:
• Blowing of mains supply fuse
• Defective mains cable
• Bad connection of mains power cable on
machine terminal block or plug of machine.
