Lincoln Electric CV320-I General, Welding Thermal Overload Protection, Cable Cleaning

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.

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.

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
ELECTRIC	working on equipment.
SHOCK	• Do not touch electrically hot parts.
can kill

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.

WARNING

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.

WARNING

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.

IMA 574B CV320-I Page 9