Lincoln Electric IM736-D manual Product Description, Controls and Settings, Other features

B-2	OPERATION
		B-2

PRODUCT DESCRIPTION

The POWER MIG 300 is a complete semiautomatic multi-process DC arc welding machine offering CV and CC DC welding. It is rated for 300 amps, 32 volts at a 60% duty cycle. The standard machine is equipped to weld CC-Stick, CC-GTAW, CV-FCAW, and synergic and non-synergic CV-GMAW / GMAW-P and Pulse-on-Pulse and Power Mode welding processes. See the descriptions for Pulse on Pulse™and Power Mode welding processes later in this section.

Mode #5 and mode #6 are non-synergic CV GMAW modes for bare and flux cored wires, respectively. In these modes, the user presets the wire feed speed (WFS) on the left meter and the welding voltage on the right. These two settings are independent; that is, if the WFS is changed the voltage will remain con- stant, or vice versa.

All of the other mode numbers designated as "CV" are synergic. Again, WFS is shown on the left meter and voltage is shown on the right meter. However, in using these modes, the WFS is preset and the voltage is preset only once. Now, when the WFS is changed, the voltage will change with it, so that the arc appearance and arc length will stay the same without the necessity to re-adjust the voltage.

The modes shown as "GMAW-P" or " GMAW-PP" are all synergic pulsed modes. In these modes WFS is shown on the left meter and "Trim" is shown on the right meter. The user adjusts WFS to obtain an arc with the correct arc energy for the material thickness being welded. The Trim, which is adjustable from val- ues of –1.5 to 0 (OFF) and up to +1.5 controls the arc length. Higher values of Trim give longer arc lengths. Once the user has adjusted the Trim for one WFS, the power supply will synergically change many variables so that, as the WFS is changed, the arc length and arc appearance will remain the same. The synergic modes are usable with both push and push – pull torches, as described later in this Manual. When using a spool gun, however, although the synergic pulsed modes are still accessible, they must be used in a non-synergic manner as described in the Accessory Section.

The digital microcomputer based control system allows easy and accurate adjustment of weld parame- ters through the multi-process panel located on the front of the machine. The POWER MIG 300 is equipped with a 6-pin and 7-pin connector to allow operation of a push-pull gun for feeding aluminum wires, a spool gun, remotes, and a foot amptrol.

Other features

Optional kits are available for push-pull welding, spool gun operation, push feeding of 3/64 aluminum with the standard POWER MIG 300 gun and wire feeder. A Dual Cylinder Mounting Kit is also offered.

CONTROLS AND SETTINGS

(See Figure B.1)

1.WIRE FEED SPEED (WFS) / AMP METER - This meter displays either the WFS or current value (Amps) depending on the status of the machine. Located below the display is the text "WFS" and "Amps." An LED light is illuminated to the left of one of these units to indicate the units of the value dis- played on the meter.

•Prior to CV operation, the meter displays the desired preset WFS value.

•Prior to CC-Stick and CC-GTAW operation, the meter displays the preset current value.

•During Welding, the meter displays actual average amps.

•After welding, the meter holds the actual current value for 5 seconds. During this time, the display is blinking to indicate that the machine is in the "Hold" period. Output adjustment while in the "Hold" period results in the "prior to operation" characteristics stated above.

•After the 5 second "Hold" period, the meter dis- plays the set WFS (CV modes) or Amp (CC modes) value.

Figure B.1

POWER MIG 300