Lincoln Electric SVM129-B service manual Welding Operation

B-5 B-5

OPERATION

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6.WIRE SIZE SELECT SWITCH: This toggle switch selects between electrode diameters of .035” (1 mm) and smaller or .045” (1.2 mm) and larger. The .035” (1 mm) position provides improved performance of smaller diameter wires at higher wire feed speeds.

7.WIRE TYPE SELECT SWITCH: This toggle switch selects between mild or stainless steel. In the stain- less position, the pulse width of the Peak Current is changed from 1 to 2 ms for better performance for stainless steel welding.

8.THERMAL SHUT-DOWN INDICATOR: This light will indicate that either the internal thermo- stat(s) or the FET over current sensor has actuated. Machine output will return after

the internal components have returned to normal operating temperature (if the thermostat(s) “opened”) or after about 3-7 seconds (if the FET over current sensor activated).

9.REMOTE RECEPTACLE: This is a 10 pin MS-type connector for remote control of Peak Current and Background Current. Trigger switch connections are also provided. The presence of the mating con- nector is automatically sensed, disabling the front panel Peak and Background Current controls. Refer to “REMOTE CON- TROL CONNECTOR” in the ACCESSORIES Section of this manual for more information.

10.WIRE FEEDER RECEPTACLE: This is 14 pin MS-type connector for the wire feeder

connection. 115 and 42 VAC along with the trigger switch connections are provid-

ed. (Only 42 VAC is available on European mod- els). There are no provisions for voltage control of the power source by the wire feeder. Refer to the Accessories section of this manual for wire feeder connection instructions.

11.ARC SENSE RECEPTACLE: This is a four pin MS- type connector for WORK and ELECTRODE sense leads. The STT requires a WORK sense and ELEC- TRODE sense lead for proper operation. The ELECTRODE sense lead is bolted together with power source electrode lead at the wire feeder gun block. The WORK sense lead is furnished with an “alligator” type clip for connection to the work piece. Refer to the LN 742 or STT-10 wire feeder connec- tion instructions in the Accessories section of this manual for proper connection of these leads.

12.42V AUXILIARY POWER CIRCUIT BREAKER: The 42 VAC supply is protected from excessive current

draws with a 6 amp circuit breaker. When the

breaker “trips” its button will extend. Depressing this button will reset the breaker.

13.115V AUXILIARY POWER CIRCUIT BREAKER

(Not on European Models): The 115 VAC supply is protected from excessive current draws with a 6 amp circuit breaker. When

the breaker “trips” its button will extend. Depressing this button will reset the breaker.

14.WORK TERMINAL: This twist-mate con- nection is the negative output terminal for connecting a work cable and clamp to the workpiece.

15.ELECTRODE TERMINAL: This twist-mate connection is the positive output terminal for connecting an electrode cable to the wire feeder conductor block. Refer to the Accessories Section for wire feeder connection instructions.

WELDING OPERATION

Familiarize yourself with the controls on the Invertec STT II before beginning to weld.

Familiarize yourself with the operating manual for the wire feeder and the wire feeder controls before begin- ning to weld.

Set the Wire Size and Wire Type selection switches per the appropriate wire. Refer to “Operational Features and Controls” in this section for the function of these switches.

INVERTEC STT