Lincoln Electric SVM176-A Theory of Operation, General Description, Input Power Circuit

Models: SVM176-A

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E-2

THEORY OF OPERATION

E-2

 

FIGURE E.2 – INPUT POWER CIRCUIT.

 

 

 

 

 

 

VOLTMETER

+

WIRE SPEED CONTROL

 

 

 

 

 

 

 

 

 

 

 

 

REDUCED SPEED CONTROL

10K, 4 W

 

 

 

 

 

567 521

 

 

 

 

A

 

 

R12

535

 

 

 

 

 

 

 

 

 

644

B

 

 

 

 

 

601

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D

 

 

 

 

 

642

 

 

 

 

 

1

2

3

4

5

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOLTAGE CONTROL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10K, 4 W

 

 

 

 

 

535

 

 

 

 

 

 

 

 

 

 

 

 

R75

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

75

 

 

 

 

 

LN-23P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

76

 

 

 

 

 

CONTROL

 

539

 

 

 

 

 

 

647

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

77

 

 

 

 

 

P.C. BOARD

 

 

 

 

 

 

 

 

 

 

 

 

3.5 A CIRCUIT

 

 

 

 

 

 

 

 

 

 

541

 

W

 

 

 

 

 

BREAKER

 

 

 

 

 

 

 

 

 

 

100, 1

R76

82V, 12J

604

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

4

2

5

3

6

 

TP2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

602

 

 

 

 

 

 

 

 

 

 

 

 

 

 

641

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

567A

67

642

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

567

521

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BLACK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WHITE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WIRE FEED MOTOR

 

 

 

 

 

GUN TRIGGER SWITCH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

604

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

602

 

A

8 PIN CONNECTOR

H

F

G

E

C

D

 

 

 

 

 

 

 

 

 

 

 

 

6 PIN CONNECTOR

F

E

D

C

B

A

 

 

 

 

 

 

 

 

 

 

 

 

77

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

604

 

75

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

647

 

76

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

REED SWITCH ACTIVATED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

521

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BY WELDING CURRENT

602

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

604

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ELECTRODE (-)

 

 

 

 

 

 

GUN CONDUCTOR BLOCK

 

WORK

 

WORK (+)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

21

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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GENERAL DESCRIPTION

The LN-23P is an Arc Voltage powered, lightweight, portable wire feed unit which includes calibrated wire speed control, voltage control, and wire drive with an enclosed 14 lb. wire reel, analog voltmeter and various input control and electrode cables.

The LN-23P was designed specifically for Innershield pipe welding, but, with the proper electrode, can be uti- lized for general purpose welding. The machine is internallly connected for negative polarity (DC-). It will feed .068 or 5/64 Innershield wire using one of several different gun cable assemblies. It is designed to be used with any Lincoln constant voltage (CV) power source that is suited to the operating range of those wires.

Other features include a Wire Speed Reduction Switch and a trigger interlock circuit which will be discussed in more detail.

INPUT POWER CIRCUIT

The DC arc voltage from the power source is applied to the LN-23P by way of the electrode cable (-)and the Work Sensing Lead (+). . Typically the work connection is through the control cable of the K350 Adapter. If no adapter is used the connection is through the power source. The voltage is then coupled to the Control Board at lead 67 and 521.

The electrode circuit (lead #67) is routed out of the board (lead #567) to the 3.5 amp circuit breaker and back to the board (lead 567A). The Circuit Breaker provides protection for the board from motor overload. Leads 567 and 521 are routed through the Control Board to the Voltmeter. See Figure E.2.

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NOTE: Unshaded areas of block logic diagrams are the subject of discussion.

LN-23P

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Lincoln Electric SVM176-A service manual Theory of Operation, General Description, Input Power Circuit

SVM176-A specifications

The Lincoln Electric SVM176-A is a robust and versatile semiautomatic wire feeder designed to cater to a wide range of welding applications. Known for its reliability and ease of use, the SVM176-A is particularly favored in both industrial and construction settings, where efficiency and performance are paramount.

One of the standout features of the SVM176-A is its compact design. This relatively lightweight unit is easy to transport and can fit into tight spaces, making it an ideal choice for mobile applications or projects that require more maneuverability. The unit's construction is durable and built to withstand the rigors of demanding work environments, ensuring longevity and consistent performance.

The SVM176-A supports various welding processes, including MIG (Metal Inert Gas) and flux-cored arc welding, providing versatility for different materials and thicknesses. This adaptability is enhanced by its ability to accommodate a variety of wire sizes, allowing users to select the ideal wire type for their specific project requirements. The equipment also features adjustable wire feed speed, helping to ensure optimal weld quality by allowing operators to tailor their settings based on the needs of the job.

Innovative technologies in the SVM176-A contribute to its performance. The unit is equipped with a digitally controlled microprocessor that streamlines operations, providing enhanced control over welding parameters. This advanced technology enables users to achieve precise welds consistently, minimizing the risk of defects and improving overall efficiency.

Another remarkable characteristic of the SVM176-A is its user-friendly interface. The unit features easy-to-read displays and intuitive controls, enabling operators to make quick adjustments without having to consult an extensive manual. This is particularly beneficial in fast-paced work environments where time is of the essence.

Furthermore, the Lincoln Electric SVM176-A boasts a range of safety features, including thermal overload protection and a sturdy casing, which safeguard both the equipment and the operator. With these characteristics combined, the SVM176-A stands out as a preferred choice for professional welders seeking reliability, versatility, and operational excellence in their equipment. This exceptional wire feeder continues to uphold Lincoln Electric's commitment to quality and performance in welding technology.