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2.4 Welding and earth return cables
Recommended copper cables with cross-sectional area are as follows:
FastMig M 320 50 – 70 mm²
FastMig M 420 70 – 90 mm²
FastMig M 520 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.
NOTE ! Always check the serviceability of the earth return cable and clamp. Ensure the metal
surface to which the cable is connected is clean from metal oxide or paint. Check the connector to
the power source is fastened correctly.
3. OPERATION CONTROLS
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.
FastMig M 320, 420, 520
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