Gas Cylinder And Regulator Connection; Replace Wire Liner - MMA Compacto Serie Manual De Uso

• Loosen and lower the plastic knob (A) (Figure
13). Open the pressure arm (B) of the feeder.
(Extract the wire from the torch liner if some
wire is left into the torch).
C
Figure 13 - Wire Feeding Motor
• When the wire is disconnected, grasp it with
pliers so that it cannot exit from the spool. If
necessary, straighten it before inserting it in
the wire input guide (C). Insert the wire on the
lower roll (D) and in the torch liner.
WARNING: keep the torch straight. When
feeding a new wire through the liner, make
sure the wire is cut cleanly (no burrs or an-
gles) and that at least 2 cm from the end is
straight (no curves). Failure to follow these
instructions could cause damage to the li-
ner.
• Lower the pressure arm (B) and place the knob
(A). Tighten slightly. If tightened too much, the
wire gets locked and could cause motor da-
mage. If not tighten enough, the rolls will not
feed the wire.
WARNING: When changing the wire
diameter being used, or replacing the
wire feed roll, be sure that the correct
groove for the wire diameter selected
is inside, closest to the machine. The
wire is driven by the inside groove.
Feed rolls are marked on the side iden-
tifying the groove nearest that side.
• Close the side panel of the machine.
• Connect the power supply cable to the power
output line. Turn on the machine. Press the
torch switch. The wire fed by the wire feeding
motor at variable speed must slide through
the liner. When it exits from the torch neck,
release the torch switch.
Note: after three seconds that torch
trigger is pressed wire feeding speed
increases to allow a fast exit of the wire
on the torch neck and gas stop flowing.
A
B
B
D D
• Turn off the machine.
• Mount the contact tip and the nozzle.
When checking the correct exit of the
wire from the torch do not bring your
face near the torch, you may run the risk
to be wounded by the outgoing wire. Do
not bring your fingers close to the fee-
ding mechanism when working! The
rolls, when moving, may crush the fin-
gers. Periodically, check the rolls. Repla-
ce them when they are worn and com-
promise the regular feeding of the wire.
GAS CYLINDER AND REGULATOR
CONNECTION
Ensure unit is powered off and unpluged
from the mains.
WARNING: Cylinders are highly pressuri-
zed. Handle with care. Serious accidents
can result from improper handling or mi-
suse of compresses gas cylinders. Do not
drop the cylinder, knock it over, expose it
to excessive heat, flames or sparks. Do not
strike it against other cylinders.
The bottle (not supplied) should be located at the
rear of the welder, securely held in position by the
chain provided.
For safety, and economy, ensure that the regulator
is fully closed, (turned counter-clockwise) when not
welding and when fitting or removing the gas cylinder.
• Turn the regulator adjustment knob counter-
clock wise to ensure the valve is fully closed.
• Screw the gas regulator fully down on the gas
bottle valve, and fully tighten.
• Connect the gas hose to the regulator secu-
ring with clip/nut provided.
• Open the cylinder valve, then set the gas flow
on the regulator to approx. 5-15l/min. For
Pulsed Welding it is suggestable to set the gas
flow to approx. 13-14l./min.
• Operate the torch trigger to ensure that the
gas is flowing through the torch.

REPLACE WIRE LINER

Ensure unit is powered off and unpluged
from the mains.
• Chose the suitable wire liner to install. Mainly
there are 2 types of wire liners:
1. Steel wire liners. These can be coated or not
coated: the coated wire liners are used for air
cooled torches; the wire liners which are not
coated are used for water cooled torches.
2. Teflon/Graphite wire liners. These are sugge-
sted for the welding of Aluminium, as they al-
low a smooth feeding of the wire. For Pulsed
Welding of Aluminium a Teflon/Graphite wire
liner with copper or brass terminal is required
to ensure a good electric contact of the wire.
EN-11