Connecting To Mains; Earth Return Cable; Shielding Gas - Kemppi FitWeld 300 Operating Manual

2.4.1 Connecting to mains

FitWeld 300 is connected to a 3-phase network using the mains cable supplied with the
machine. The cable is not equipped with a wall plug, so you must install a suitable plug before
you use the machine for the first time.
Check also that the mains cable complies with the local electrical regulations, and replace the
cable if necessary. See 'Technical specifications' .
The mains cable or wall plug may be installed or replaced only by an electrical contractor or
NOTE!
installer authorised to perform such operations.

2.4.2 Earth return cable

For creating a closed electric circuit needed in welding, you must connect the earth return
cable to the connector located on the back of the FitWeld. The other end of this cable will be
connected to the workpiece before welding.
When attaching the earth return clamp to the work piece, remember to clean the work piece
NOTE!
surface so as to achieve safe and undisturbed operation.

2.4.3 Shielding gas

Secure the snap connector of the shielding gas hose to the gas connector on the back of the
FitWeld machine. Connect the other end of the gas hose to a gas cylinder's control valve or to
the shielding gas distribution network at your worksite.
Make sure that you are using the correct type of shielding gas for the welding application.
The shielding gas used for steel wires is carbon dioxide or a mixture of argon
and carbon dioxide. The shielding gas used for stainless steel filler wires is a mixture of argon
and carbon dioxide (2%). For aluminium filler wires use pure argon shielding gas.
The thickness of the parent material, joint type and welding power define the required
shielding gas flow rate.
To connect the shielding gas hose to a suitable regulator for MIG/MAG welding
1. Connect the shielding gas hose to the gas cylinder's control valve and tighten the
connector (connector is not supplied in the package).
2. Adjust the shielding gas flow rate with the control valve screw.
3. Always close the cylinder valve after use.
The shielding gas flow rate set from the gas cylinder regulator must exceed the flow rate
NOTE!
measured at the welding gun, if GasGuard function is active. If the flow rate and pressure are the
same, the gas indicator light will shine on the control panel and welding is prevented.
See also instructions and warnings about adjusting the FitWeld's gas flow rate later in this
manual.
© Kemppi Oy / 1202
EN
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