Cornwell Tools MMW240TIG, Owner'S Manual

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2. SET UP INSTRUCTIONS FOR DC TIG WELDING

Connect TIG torch to the NEGATIVE terminal on the front of the machine (See item 4 of the
INSTALLATION section).

Connect the ground cable to the POSTIVE terminal on the front of the machine (See item 4
of the INSTALLATION section).

Connect the Argon regulator securely to the cylinder. Secure and tighten one end of hose to
regulator, and the other end to the gas fitting on the rear of the welding machine. Slowly
open valve on cylinder. (See items 6 and 7 of the INSTALLATION section).

Connect foot control to 5-pin receptacle on the lower front panel. (See item 8 of the
INSTALLATION section).

Connect the primary power cable to 230 volt AC single phase electricity.

Turn on the machine using switch on the back of the machine (See item 6 of the
INSTALLATION section).

Use the PROCESS SELECTOR BUTTON to Select HF TIG on front panel

Use the MODE SELECTOR BUTTON on the front panel to Select DC.

Use the CONTACTOR CONTROL BUTTON TO Select RMT AMP position on front panel

Use one of the FUNCTIONAL CONTROL INDEX BUTTONS until the PRE FLOW indicator
light is on. Use the FUNCTIONAL CONTROL KNOB to select the preferred seconds of pre
flow as displayed on the Digital Functional Control Display. Example: Set Pre Flow to 3 SEC.
The purpose of pre flow is to cover the welding zone with shielding gas prior to the arc start.
This generally is a short setting. Hold the TIG torch steady during pre flow.

Use one of the FUNCTIONAL CONTROL INDEX BUTTONS until the POST FLOW indicator
light is on. Use the FUNCTIONAL CONTROL KNOB to select the preferred seconds of post
flow as displayed on the Digital Functional Control Display. Example: Set Post Flow to 10
SEC.

NOTE: Adjust the gas flow rate using the adjustable knob on the regulator. (See item 7 of
the INSTALLATION section). Depress the foot pedal and set the flow rate at approximately
20 CFH. With foot pedal depressed Open and Adjust the flow control valve on the regulator
to approximately 20 CFH. Release foot pedal.
Machine is now set up to TIG weld using DC output.
3. SET UP INSTRUCTIONS FOR AC TIG WELDING

Connect TIG torch to the NEGATIVE terminal on the front of the machine (See item 4 of the
INSTALLATION section).

Connect the ground cable to the POSTIVE terminal on the front of the machine (See item 4
of the INSTALLATION section).

Connect the Argon regulator securely to the cylinder. Secure and tighten one end of hose to
regulator, and the other end to the gas fitting on the rear of the welding machine. Slowly
open valve on cylinder. (See items 6 and 7 of the INSTALLATION section).

Connect foot control to 5-pin receptacle on the lower front panel. (See item 8 of the
INSTALLATION section).

Connect the primary power cable to 230 volt AC single phase electricity.

Turn on the machine using switch on the back of the machine (See item 6 of the
INSTALLATION section).