Lincoln Electric liquidarc Maxmig 330R - User Manual

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A Division of The Lincoln Electric Company (Aust) Pty Ltd A.B.N. 36 000 040 308

35 Bryant Street, Padstow, Sydney 2211, Australia

SAFETY DEPENDS ON YOU

LiquidArc machines are designed and built with safety in mind. However, your overall safety can be

increased by proper installation . . . and thoughtful operation on your part. Read and observe the general

safety precautions on page 2 and follow specific installation and operating instructions included in this

manual.

Most importantly, think before you act and be careful.

IMA 566BLA

July 2003

Maxmig 330R

Part No. 05-4330

‘

Operating Manual

Code Machine

1546 05-4330

1648 05-4330

70013 05-4330

Questions and Answers

J
Jennifer BellNov 6, 2025
What to do if Lincoln Electric liquidarc Maxmig 330R Welding System wire is not feeding?
- S
  Stephanie RobinsonNov 6, 2025
  To troubleshoot rough wire feeding or when the wire isn't feeding but the drive rolls are turning on your Lincoln Electric Welding System, ensure the electrode lead and gun cable are tight, including the gun cable in the wire feeder contact block, the gun nozzle, and the gun tip. Also, verify that all work lead connections are secure. Inspect the gun cable, replacing it if necessary. Remove any obstructions in the gun and cable, replacing the gun and cable if needed. Refer to the Wire Drive Roll Section for proper drive roll installation. Remove, clean, install, and tighten components. Clean the cable or replace the liner. Replace any worn parts. Replace the contact tip and remove spatter. Set the idle roll pressure. Check the connection at the output studs for correct polarity. Clean the ...

The Maxmig 330R is a versatile arc welding machine designed for industrial and professional use, offering both gas shielded and self-shielded welding capabilities within its current range. It combines a solid-state controlled power source with similarly controlled wire feeding equipment, ensuring excellent arc characteristics. The machine is available in an integrated configuration or with a remote wire feeder.

Function Description

The Maxmig 330R provides a constant voltage DC arc welding power source. It is designed to be used with a remote wire feeder (for the 05-4330 model) or as an integrated unit. The machine facilitates Gas Metal Arc Welding (GMAW) processes, also known as MIG welding.

Important Technical Specifications

Model: Maxmig 330R (Remote)
Part No.: 05-4330
Maximum Open Circuit Voltage: 45V
Output Current Range: Up to 400A
Rated Input: 415V 3ph 50Hz 13.5 amps
Wire Speed Range: 1-20 m/min (40 to 790 inches/min)
Weight (complete with undercarriage): 130 kg
Dimensions (H x W x L) Over lift bail, cylinder tray & wheels: 1129 x 525 x 885mm
Operating Temperature: -20°C to 40°C
Duty Cycle:
- 30% at 320A/30V
- 60% at 240A/26V
- 100% at 190A/23.5V
Gun and Cable: The machine is supplied with a Maxmig 360 3m Ergonomic MIG gun and cable, fitted with a 1.2mm liner and a 1.2mm contact tip. The gun trigger switch must be capable of switching 10 milliamps at 60 volts DC - resistive.
Drive Rolls: Supplied with a 0.9/1.2mm hard wire feed roll as standard. Drive rolls for other types and sizes are available as spare parts. Available drive rolls include sizes from 0.6-0.8mm to 1.2-1.6mm for hard wire, aluminium wire, and cored wire.

Usage Features

Controls: The machine features output volt and amp meters, a spot timer, and gas purge facilities.
Voltage Control: Output voltage is controlled by two rotary switches: one for four "coarse" voltage settings (and mains power on/off), and another for eight "fine" voltage settings, allowing selection of 32 welding voltages.
Wire Feed Speed Control: This control adjusts the electrode wire feed speed, which effectively controls the welding current. The wire feed motor is dynamically braked to minimize wire overrun.
Spot Welding: In spot welding mode, welding occurs for a pre-set time (0.5 to 4 seconds), adjustable via a control on the front panel.
Gas Purge: A push button operates the gas solenoid to purge air from the hose after connecting a new gas cylinder. This function only works when the button is held.
Wire Inch: A push button operates the wire feed motor to "cold" inch the wire.
2T/4T Operation: A two-position switch on the front panel provides two modes for the gun trigger.
- 2T Mode: Pressing the trigger starts welding, releasing it stops welding.
- 4T Mode: Pressing the trigger operates the gas solenoid. Releasing the trigger activates the contactor, starting wire feed and welding current. To stop, the trigger is pressed again (stopping wire feed, activating burn back delay, and opening the contactor), and then released (stopping gas flow). This mode is recommended for long welds.
Polarity Connection: The integrated machines are factory-connected electrode (+)ve for GMA welding. Polarity can be changed by connecting the flexible lead to the required output stud. Remote wire feeder machines connect the electrode cable to the output stud and the control cable to the front panel plug.
Cylinder Mounting: A rear platform with a chain is provided for securing a gas cylinder.
Input Lead: The machine is supplied with a 3m input lead.

Maintenance Features

General Maintenance: In dusty locations, dirt can clog air passages and cause overheating. Regular cleaning with low-pressure air is recommended. Fan motors have sealed ball bearings and require no service.
Thermal Overload Protection: Built-in protective thermostats open the wire feed and welder output circuits if the machine exceeds safe operating temperatures due to overload or high ambient temperatures. These thermostats automatically reset when the temperature cools.
Gun and Cable Maintenance:
- Cable Cleaning: The cable liner should be cleaned after approximately 150kg of electrode use. This involves removing the cable from the wire feeder, laying it straight, removing the contact tip, and blowing out the liner with compressed air (approx. 350 kPa/50psi). Flexing the cable and repeating the blow-out procedure is recommended.
- Gun Tips and Nozzles: The gun tip should be replaced when worn and sized correctly for the wire type and diameter. Spatter should be removed from the gas nozzle and tip every 10 minutes of arc time or as required.
Drive Rolls and Guide Tubes: After every coil of wire, the wire drive mechanism should be inspected and cleaned with low-pressure compressed air. Solvents should not be used on the idle roll. Drive rolls are stamped with wire sizes and must be changed if a different size wire is used.
Spool Tension: The spool hub tension should be adjusted to prevent wire overrun or dragging.
Electrode Size and Type Changes: When changing electrode size or type, ensure the correct wire feed roll, cable liner, and contact tip are used. Check electrode polarity as different processes may require different polarities.
Input Lead: If the supply cord is damaged, it must be replaced with a special cord (Part No. AS4303).
PC Board Replacement: Procedures are outlined for replacing PC boards, including visual inspection for damage, checking harness connections, and troubleshooting potential causes of failure (shorts, opens, grounds).
Wire Burnback and Motor Acceleration Settings: Trimmers on the PCB (labelled 'R.T.S.' for burnback time and 'Rampa' for acceleration rate) allow adjustment of these parameters. Burnback time adjusts the delay between drive motor stop and power/gas solenoid switch-off (0.1 to 1.1 seconds). Acceleration rate controls the drive motor's speed increase from stationary to set wire feed speed, important for aluminium welding.