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The table below lists the fuse sizes for 100% load in a 400-V three-phase network with

4x10-mm² cable for dierent power source models.

Model Fuse

KM 300 20 A delayed

KM 400 25 A delayed

KM 500 35 A delayed

2.3 WELDING AND EARTHING CABLES

The device has a welding cable connection both in the front and in the rear. The positions of

the welding and earthing cable connections are shown earlier in section 'Introduction'.

The welding cable type to be used is rubber-insulated copper cable. The recommended cross-

sectionsofthecablesfordierentpowersourcemodelsareasfollows:

Model Cross-section

KM 300 50…70 mm²

KM 400 70…90 mm²

KM 500 70…90 mm²

The table below shows the typical load capacities of the cables when the ambient

temperatureis25°Candtheleadtemperatureis85°C.

Cable Duty cycle (ED) Voltage loss / 10 m

100 % 60 % 35 % 20 %

50 mm² 285 A 316 A 371 A 458 A 0,35 V / 100 A

70 mm² 355 A 403 A 482 A 602 A 0,25 V / 100 A

95 mm² 430 A 498 A 606 A 765 A 0,18 V / 100 A

120 mm² 500 A 587 A 721 A 917 A 0,21 V / 100 A

NOTE! Do not overload the welding cables, as an overload may cause voltage loss and

overheating.

Connecttheearthclampdirectlytotheworkpieceinsuchawayastomaximisethecontact

surface of the clamp. The point of connection must be unpainted and free of corrosion.

3. MACHINE USE

3.1 STARTING OF THE POWER SOURCE

Startthepowersourcebyturningthemainswitch(A2)onthefrontpaneltothe‘I’position.

The standby indicator (A3) turns on. The control panel and wire feeder are not operational yet,

andthetext‘OFF’isshownonthecontrolpaneldisplay.

NOTE! Always turn the device on and o using the main switch, not via the mains socket.

Thecoolingfanisstartedforamomentwhenthemainswitchisturnedtothe‘I’position.The

fan turns o after a while and then restarts during welding when the machine has warmed up

suciently.Thefancontinuesrunningevenafterupto10minutesofwelding,dependingon

the temperature of the machine.

Kemppi FastMig KM400 User Manual

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