Control of Welding Current

B-6

OPERATION

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CAUTION

•DO NOT turn the CURRENT RANGE SELECTOR while welding because the current may arc between the contacts and damage the switch.

•DO NOT attempt to set the CURRENT RANGE SELECTOR between the five points designated on the nameplate.

See Figure B.2. The CURRENT RANGE SELECTOR provides five overlapping current ranges. The FINE CURRENT ADJUSTMENT adjusts the current from minimum to maximum within each range. Open circuit voltage is also controlled by the FINE CURRENT ADJUSTMENT, permitting control of the arc character- istics.

A high open circuit voltage setting provides the soft "buttering" arc with best resistance to pop-outs pre- ferred for most welding. To get this characteristic, set the CURRENT RANGE SELECTOR to the lowest set- ting that still provides the current you need and set the FINE CURRENT ADJUSTMENT near maximum. For example: to obtain 175 amps and a soft arc, set the CURRENT RANGE SELECTOR to the 190 -120 posi- tion and then adjust the FINE CURRENT ADJUST- MENT for 175 amps.

When a forceful "digging" arc is required, usually for vertical and overhead welding, use a higher CURRENT RANGE SELECTOR setting and lower open circuit voltage. For example: to obtain 175 amps and a force- ful arc, set the CURRENT RANGE SELECTOR to 240- 160 position and the FINE CURRENT ADJUSTMENT setting to get 175 amps.

Some arc instability may be experienced with EXX10 electrodes when trying to operate with long arc tech- niques at settings at the lower end of the open circuit voltage range.

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FIGURE B.2 – CURRENT CONTROLS

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CURRENT RANGE SELECTOR

	CURRENT RANGE		FINE CURRENT
190-120	SELECTION		ADJUSTMENT	60	50
240-160	130-80			60	50
240-160	130-80			70	40
				70	40
220	90			80	30
MAX	MIN			90	20
				90	20
				100	10
IDLER IGNITION		ENGINE		START
IDLER IGNITION		PROTECTION		START
230 VOLT AC		115 VOLT AC		REMOTE
230 VOLT AC		115 VOLT AC		CONTROL
				CONTROL

FINE CURRENT ADJUSTMENT

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SA-250

SVM128-A specifications

The Lincoln Electric SVM128-A is a cutting-edge welding machine designed to meet the demands of both professional welders and DIY enthusiasts. This versatile welding power source brings together advanced technology and robust design, making it a reliable choice for various welding applications.

One of the standout features of the SVM128-A is its capability to perform multiple welding processes. It supports MIG, TIG, and stick welding, allowing users to tackle a wide range of projects with ease. This multi-functionality makes it ideal for professionals working in different industries, as well as for hobbyists who enjoy diverse welding tasks.

The SVM128-A is equipped with inverter technology, which enhances its performance by providing a more stable arc and improved energy efficiency. This technological advancement contributes to lower operational costs and allows for a more consistent weld quality across different materials and thicknesses. Additionally, the inverter technology enables the machine to be lightweight and portable, making it convenient for jobs that require mobility.

Another prominent characteristic of the SVM128-A is its user-friendly interface. The machine features intuitive controls and a digital display that allows operators to easily set the desired welding parameters. This simplified setup helps reduce the learning curve for new users while also offering precise control for experienced professionals.

The Lincoln Electric SVM128-A is designed with durability in mind. Its robust construction ensures that it can withstand the rigors of frequent use in demanding environments. The machine is also equipped with various safety features, including thermal overload protection and a duty cycle rating that prevents overheating, ultimately extending its lifespan.

For optimal performance, the SVM128-A provides adjustable output options, allowing users to customize the welding parameters based on their specific needs. This flexibility makes it suitable for welding various metals, including steel, aluminum, and stainless steel.

In summary, the Lincoln Electric SVM128-A combines versatility, advanced technology, and a user-friendly design. With its capability to perform multiple welding processes, lightweight construction, and durable features, it stands out as an excellent option for anyone looking to achieve high-quality welds. Whether for professional or personal use, the SVM128-A is poised to deliver reliable performance and exceptional results.

Lincoln Electric SVM128-A service manual Control of Welding Current, Current Range Selector

Models: SVM128-A

OPERATION