Manual Kemppi A7 MIG Power Source 450 (page 62 of 67) (English)

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A7 MIG Welder© Kemppi Oy 2018 1824

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 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 wel-

ding.

Control fuses

Fuse, 6.3 A delayed, on the rear wall of the machine provi-

des 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 en-

gine generator. If the mains have undervoltage (under ap-

prox. 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 wel-

ding 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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Kemppi A7 MIG Power Source 450 Manual

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