Welding And Earth Return Cables; Interconnection With Wire Feeder; Operation Control; Main Switch I/O - Kemppi 350 Operating Manual

2.5.4 welding and earth return cables

Kemppi always recommend the use of high quality copper cables with a suitable cross-
sectional area. Cable size should be selected depending on the intended welding application.
50mm2 Copper welding cables may be used for low duty work in basic or Synergic 1-MIG.
However when using Pulse MIG/MAG process, and or longer cables, and or higher welding
power, voltage loss increases, and therefore smaller cross sectional interconnecting power and
return cables will restrict the welding performance of your machine.
• FastMig Pulse 350 – 70 to 90 mm²
• FastMig Pulse 450 – 70 to 90 mm²
The enclosed table shows typical load capacities of rubber insulated copper cables, when
ambient temperature is 25 °C and the cable temperature is 85 °C.
Cable
50 mm²
70 mm²
95 mm²
Do not overload welding cables due to voltage losses and heating.
Always check the serviceability of the earth return cable and clamp. Ensure the metal
NOTE!
surface to which the cable is connected is clean from metal oxide or paint. Check the connector to
the power source is fastened correctly.

2.5.5 interconnection with wire feeder

Kemppi provide a choice of interconnection cable sets for different environments. Only
materials that meet the demands of Kemppi's international markets are used in their
EN
construction.
Used correctly, Kemppi cables sets ensure high welding performance and serviceability.
Before use, always ensure the cable set is in good condition and that connectors are correctly
fastened. Loose connections reduce welding performance and may result in damage to
connectors due to heating effects.
For correct connection and configuration of cable sets, please refer to schematic drawings:
2.5.1 and 2.5.2
FastMig 350/450 power sources are designed to be used ONLY with MXF wire feed units.
NOTE!
3.

OPeratiOn COntrOl

3.1

Main switCh i/O

When you turn the on/off switch into I -position, the pilot warning lamp is illuminated and
the machine is ready for use. Always turn the machine on and off with the power source mains
switch. Never use the mains plugs as a switch.
3.2

PilOt laMPs

The pilot lamps of the machine report its operational state:
The green pilot lamp when lit, indicates that the machine is switched on and ready for
use, and that it is connected to the mains supply with the power source main switch in the
I-position.
When lit, the orange lamp indicates that the thermal protection circuit has been activated due
to higher than normal working loads that exceed the rated duty cycle. The cooling fan will
continue to run and cool the machine down. When the lamp is off the machine is again ready
to weld.
8
Duty cycle ED
100 % 60 %
285 A 370 A
355 A 460 A
430 A 560 A
Voltage loss / 10 m
30 %
520 A 0.35 V / 100 A
650 A 0.25 V / 100 A
790 A 0.18 V / 100 A