Kemppi KM 300 - Manual (Page 13)

EN
18.0 m/min).
10. Repeat steps 6 – 8 for this higher calibration point.
11. The message ‘Suc cES’ appears on the display to indicate that calibration has ended
successfully. At the same time, the device exits calibration mode and returns to basic
operation mode.
12. In order to increase the accuracy of the calibration, calibration process should be done
twice. Therefore, repeat steps 2 – 11 and then device is ready for welding.
4. TROUBLESHOOTING
In the event of a failure of the machine, contact an authorised Kemppi service agent. Before
taking your unit for servicing, check the list below.
4.1 Overload (yellow indicator lit)
Two simultaneously operating fans cool the power source. The machine may, however,
overheat if continuously loaded above the rated values or if the circulation of cooling air is
prevented.
The yellow indicator (A10) is lit in the event of overheating. You then need to stop welding and
let the machine cool down. The indicator light turns off when welding can be resumed.
4.2 Control cable connector fuse
The rear wall of the power source contains fuse A9, which protects the control cable
connector, A7. Using an incorrect fuse may cause damage to the power source. It is important
that you always use the right kind of fuse. The type and size of the fuse are indicated next to
the fuse socket.
4.3 Electric network overvoltage or undervoltage
If the power source is used in an electric network with insufficient voltage (less than 300 V),
the control features of the device are disabled automatically.
The primary circuits of the power source are protected against power spikes. The product’s
mains voltage range is broad enough to prevent overvoltage problems at up to 440 V (see
Section 8, ‘Technical specifications’). Make sure that the voltage remains within the allowed
range, especially if the operating power is supplied by a generator set.
4.4 Missing phase in the electric network
If a phase is missing from the mains current, the welding features will be adversely affected or
the machine may have problems starting. Loss of a phase can be caused by a:
• Blown mains fuse.
• Damaged mains cable.
• Poor mains cable connection in the machine’s terminal block or mains socket.
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