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Kemppi A3 MIG Power Source 400 Manual

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A3 MIG Welder© Kemppi Oy 2018 1826
OPERATING MANUAL
6. OPERATION DISTURBANCES
Should you experience a malfunction from your machine,
please consult the basic troubleshooting text above rst,
and complete some basic checks.
If the machine malfunction cannot be corrected with
these measures, contact your Kemppi maintenance ser-
vice workshop.
Operation of the overload protection
Yellow thermal protection lamp is lit when the thermo-
stat 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 pro-
vides protection for auxiliary devices.
Use the same type and rating of fuse as marked beside
the fuse adapter. Damage caused by incorrect fuse selec-
tion is not covered by the guarantee.
Under- and overvoltage 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 en-
gine generator. If the mains have undervoltage (under
approx. 300 V) or overvoltage (over approx. 480 V) ma-
chine 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.
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