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2.4 WELDING AND EARTH CABLES

Recommended copper cables with cross-sectional area are as follows:

FastMig KMS 300 50 – 70 mm²

FastMig KMS 400 70 – 90 mm²

FastMig KMS 500 70 – 90 mm²

In enclosed table are shown typical load capacities of rubber insulated copper cables, when

ambient temperature is 25 °C and lead temperature is 85 °C.

Cable Duty cycle ED Voltage loss / 10 m

100 % 60 % 30 %

50 mm² 285 A 370 A 520 A 0.35 V / 100 A

70 mm² 355 A 460 A 650 A 0.25 V / 100 A

95 mm² 430 A 560 A 790 A 0.18 V / 100 A

Do not overload welding cables due to voltage losses and heating.

Fasten the earth clamp of the return current cable carefully, preferably direct onto the piece to

be welded. The contact surface of the earth clamp should always be as large as possible.

Clean the fastening surface from paint and rust.

3. OPERATION CONTROL SWITCHES AND POTENTIOMETERS

3.1 MAIN SWITCH I/O

When you turn the switch into I-position, pilot lamp H11 on the front face is illuminated and

the machine is ready for use.

NOTE! Always turn the machine on and o with the mains switch, never use the mains plugs as a

switch.

3.2 PILOT LAMPS

The pilot lamps of the machine report the electric operation:

The green pilot lamp H11 when lit indicates that the machine is on and ready for use and it is

connected to the mains supply with the main switch in the I-position.

H12 indicates when lit that the thermal protection of the machine has been activated due to

over heating. The cooling fan will continue to run and cool the machine down and when the

lamp is o the machine is ready to weld.

3.3 OPERATION OF COOLING FAN

In FastMig power sources there are two simultaneously operating fans.

• The fan is started for a moment when main switch is placed into position I.

• The fan will start during welding as the machine heats up and it will run for 1 to 10

minutes after the welding has stopped.

4. MANUAL METAL ARC WELDING

The FastMig power source can be used in electrode welding by connecting a FastMig

MFS 53, MFS 55 or MSF 57 wire feeder to it. The power source can be made suitable for

electrode welding without a wire feeder by connecting an R10 or R20 remote control to the

X14 or X15 terminal at the back of the power source for welding current adjustment, and the

welding power cable connected to the power source’s (+) connector X11 or X12.

Kemppi KMS 300 User Manual

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