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If gas shielding is required, see Section 1.4. Connect the gas
hose.
Remember that gas cylinders may explode if damaged, so ensure
that all gas cylinders are securely mounted.
Ensure there are no kinks or sharp bends in the gun cable and
hold the wire inch button until the wire emerges from the gun. It is
good practice to remove the tip when first feeding a new coil of
wire, then refit over the wire and tighten.
Cut off the end of the wire leaving 10mm to 15mm stick-out.
The gun polarity is selected by connecting the wire feeder cable to
the required output stud. e.g. electrode (+) - connect the lead to
the (+) output stud. For electrode (-) - connect the lead to the (-)
output stud.
Connect the work lead to the other output stud.
Welding
WARNING
When the gun trigger is pressed (2T mode) or pressed and
released the first time (4T mode), the wire is at welding
voltage. The wire should never touch the case of the wire
feeder. If it does, it is possible for the wire to arc to the case.
Any wire overrun should be avoided.
(Refer wire feeder instruction manual.)
Put into 2T mode.
Select the output voltage required to suit the job by setting the
coarse and fine rotary switches.
Before beginning welding, ensure the wire protrudes from the gun
tip by approximately 10-15mm. Ensure welding shield and other
protective clothing are in place. Present the protruding electrode
just off the work. Maintain a steady grip on the gun, protect your
eyes with a welding shield, then press and hold the gun trigger to
create the arc.
If it is necessary to adjust the weld voltage, stop welding before
changing either or both of the rotary switches.
Adjust the wire feed speed as necessary to suit the job. At the
completion of the weld, release the gun trigger and pull the gun
away from the work to stop the arc.
4T mode should only be used by experienced operators for long
welds.
Maintenance
Safety Precautions
Routine Maintenance
WARNING
• Have an electrician install and
service this equipment.
• Turn the input power off at the fuse
box,or unplug input lead before
working on equipment.
ELECTRIC
SHOCK
• Do not touch electrically hot parts.
can kill
IMA 574B
General
In extremely dusty locations, dirt may clog the air passages and
cause the welder to run hot. Blow dirt out of the welder with low-
pressure air at regular intervals to eliminate excessive dirt and
dust build-up on internal parts.
The fan motor has sealed ball bearings which require no service.
Welding Thermal Overload Protection
The CV320-I has built-in protective thermostats that respond to
excessive temperature. They open the wire feed and welder
output circuits if the machine exceeds the maximum safe
operating temperature because of a frequent overload, or high
ambient temperature plus overload. The over temperature light
glows when the thermostats open. The thermostats automatically
reset when the temperature reaches a safe operating level.
Gun and Cable Maintenance
Cable Cleaning
Clean cable liner after using approximately 150kg of electrode.
Remove the cable from the wire feeder and lay it out straight on
the floor. Remove the contact tip from the gun. Using an air hose
and approx. 350 kPa (50psi) pressure, gently blow out the cable
liner from the gas diffuser end.
Excessive air pressure at the start of cable cleaning may
cause dirt to form a plug.
Flex the cable over its entire length and again blow out the cable.
Repeat this procedure until no further dirt comes out.
Turn the welder power switch off before removing gun tips
and nozzles.
Gun Tips and Nozzles
The gun tip should be replaced when worn. Replace with the
correct size for the wire type and diameter. Too large a tip for the
electrode wire will cause arcing within the gun cable and possible
jamming of the wire within the cable .
Remove spatter from inside of gas nozzle and from tip after each
10 minutes of arc time or as required.
Procedure for Replacing PC Boards
When a PC Board is to be replaced, the following procedure must
be followed:
Visually inspect PC Board in question.
1.
Are any of the components damaged?
2.
Is a conductor on the back side of the board damaged?
3.
If there is no damage to the PB Board, insert a new PC Board
and see if this remedies the problem. If the problem is
remedied, reinstall the old PC Board and see if the problem
still exists with the old PC Board.
a) If the problem does not exist with the old board, check the
PC Board lead harness plugs.
b) Check leads in the harness for loose connections.
CV320-I
WARNING
WARNING
Page 9
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