OPERATION DISTURBANCES7.
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 service
workshop.
OPERATION OF THE OVERLOAD PROTECTION7.1
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 FUSES7.2
Fuse, 6.3 A delayed, on the rear wall of machine provides protection for auxiliary devices.
NOTE! Use same type and rating of fuse which is marked beside the fuse adapter. Damage caused
by a wrong type fuse is not covered by the guarantee.
UNDER AND OVERVOLTAGES IN THE MAINS SUPPLY7.3
Primary circuits of the machine are protected against sudden, transient overvoltages. The
machine is designed to withstand 3 x 440 V voltage continuously (see technical data). Ensure
that voltage is kept within this admissible limit, especially when the mains supply is provided
by a combustion engine generator. If the mains has under voltage (under approx. 300 V) or
overvoltage (over approx. 480 V) machine control stops operation automatically.
LOSS OF A PHASE IN THE MAINS SUPPLY7.4
Loss of a main 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 connection cable on terminal block or plug of machine.•
13
FastMig KMS 400 AS / © Kemppi Oy / 1021
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