Lincoln Electric SP-255 manual 4INSTALLATION, Shielding GAS

A-4INSTALLATION

Gun - END VIEW

However, the thumbswitch functions available on the Magnum 250SP gun will only be operable from the front panel keypad. The gun trigger switch must be capable of switching 5 milliamps at 15 volts DC– resistive.

CAUTION

The gun trigger switch connected to the gun trig- ger control cable must be a normally open, momentary switch. The terminals of the switch must be insulated from the welding circuit. Improper operation of or damage to the SP-255 might result if this switch is common to an electri- cal circuit other than the SP-255 trigger circuit.

SHIELDING GAS

(For Gas Metal Arc Welding Processes)

Customer must provide cylinder of appropriate type shielding gas for the process being used.

WARNING

CYLINDER may explode if damaged.

Gas under pressure is explosive.

Always keep gas cylinders in an upright position and always keep chained to undercarriage or stationary support.

See American national Standard Z49.1, “Safety in Welding and Cutting” published by the American Welding Society.

1.Set gas cylinder in rear platform of SP-255. Hook chain in place to secure cylinder to rear of welder.

2.Remove the cylinder cap. Inspect the cylinder valves for damaged threads, dirt, dust, oil or grease. Remove dust and dirt with a clean cloth.

DO NOT ATTACH THE REGULATOR IF OIL, GREASE OR DAMAGE IS PRESENT! Inform your gas supplier of this condition. Oil or grease in the presence of high pressure oxygen is explosive.

IDEALARC SP-255 OCT94

3.Stand to one side away from the outlet and open the cylinder valve for an instant. This blows away any dust or dirt which may have accumulated in the valve outlet.

WARNING

Be sure to keep your face away from the valve outlet when “cracking” the valve.

4.Inspect the regulator for damaged threads, dirt, dust, oil or grease. Remove dust and dirt with a clean cloth.

DO NOT USE THE REGULATOR IF OIL, GREASE OR DAMAGE IS PRESENT! Have an authorized repair station clean the regulator or repair any damage.

5.Attach the flow regulator to the cylinder valve and tighten the union nut(s) securely with a wrench.

NOTE: If connecting to 100% CO2 cylinder, insert regulator adapter provided between regulator and cylinder valve. If adapter is equipped with a plastic washer, be sure it is seated for connection to the CO2 cylinder.

6.Attach one end of the inlet gas hose to the outlet fitting of the flow regulator, the other end to the SP- 255 rear fitting, and tighten the union nuts securely with a wrench.

7.Before opening the cylinder valve, turn the regula- tor adjusting knob counter-clockwise until the adjusting spring pressure is released.

8.Open the cylinder valve slowly a fraction of a turn. When the cylinder pressure gauge pointer stops moving, open the valve fully.

WARNING

Never stand directly in front of or behind the flow regulator when opening the cylinder valve. Always stand to one side.

9.The flow regulator is adjustable. Set it for the flow rate recommended for the procedure and process being used before making the weld.