Internal Connections; External Connections - Elettro CF MIG 248 Instruction Manual

2.2 INTERNAL CONNECTIONS

• Any intervention carried out inside the welding
machine must be performed by qualified personnel.
• Before working inside the welding machine, make
sure that the plug is disconnected from the power
mains.
• After final inspection, the welding machine is
connected to the voltage indicated on the power
supply cable.
• To change the supply voltage, remove the right side
panel and arrange the voltage change terminal board
connections as shown in the picture.
• The supply voltage may not be changed on single-
phase power sources.
• Do not use the welding machine without its cover or side
panels for obvious safety reasons, and to avoid altering the
cooling conditions for internal components.
• Connect a plug suitable for the absorbed current to the
power supply cable.
• Connect the yellow-green wire of the machine mains to an
efficient grounding socket.

2.3 EXTERNAL CONNECTIONS

2.3.1 Connecting the mass clip.
• Connect the earth cable terminal to the socket of the
welding machine, and connect the earth clamp to the
workpiece.
2.3.2 Cylinder placement and connecting the gas hose
• Position the cylinder on the cylinder holder of the welding
machine, using the chains provided to fasten it to the top
panel of the machine.
• The gas cylinder must not be higher than 1,65 m
(items 248-249-252-256) and 1 m (items 247-261), to
avoid creating hazardous conditions.
• Periodically check for wear on the chains, and order
replacements if necessary.
• The cylinder must be equipped with a pressure regulator
complete with flow gauge.
• Only after positioning the cylinder, connect the outgoing
gas hose from the rear panel of the machine to the
pressure regulator.
• Adjust the gas flow to approximately 10/12 litres/minute.
3 DESCRIPTION OF CONTROLS (pict. 2)
3.1 CONTROLS ON THE FRONT OF THE MACHINE
A - Yellow LED.
Lights when the thermostat interrupts the welding machine
operation.
B - Green LED.
Signals that the machine is on.
C - Selector switch.
Turns the machine on or off and selects the welding
voltage ranges.
D - Central adapter.
This is where the welding torch is to be connected.
E - Earth sockets.
Sockets to which to connect the earth cable. (Some
versions have a single earth socket).
F - Setting knob.
Turning this knob adjusts the spot welding time. The
machine begins welding when the torch trigger is pressed.
The spot welding time is set via the knob. To start the cycle
over, release and press the torch trigger again.
G -Setting knob.
Adjusting this knob changes the welding wire speed.
H - Selector switch.
Fine-tunes the welding voltage within the range previously
selected via selector switch C.
4 WELDING
4.1 INSTALLATION
Make sure that the wire diameter corresponds to the
diameter indicated on the wire feeder roller, and that the
selected program is compatible with the material and type
of gas. Use wire feeder rollers with a "U"-shaped groove for
aluminium wires, and with a "V"-shaped groove for other
wires.
4.2 THE MACHINE IS READY TO WELD
• Connect the earth clamp to the workpiece.
• Set the switch C to 1.
• Remove the gas nozzle.
• Unscrew the contact tip.
• Insert the wire in the wire liner of the torch, making sure
that it is inside the roller groove and that the roller is in the
correct position.
• Press the torch trigger to move the wire forward until it
comes out of the torch.
• Caution: keep your face away from the gun tube
8