Lincoln Electric SVM179-B service manual Theory of Operation, Figure E.2 General Description

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E-2

THEORY OF OPERATION

E-2

FIGURE E.2 — GENERAL DESCRIPTION

ELECTRODE

67

INPUT

INPUT

CONTACTOR

CURRENT TRANSDUCER

FEEDPLATE

SOLENOID

POLARITY

V M

TIMER OPTION

MOTOR

TACH

GUN

MOTOR

OVERLOAD

ARMATURE

CONTROL BOARD

21

TACH FEEDBACK

1

GUN TRIGGER

WIRE

REMOTE

14 PIN AMPHENOL

SPEED

VOLTAGE

COLD

CC

TRIGGER

GAS

21

FEED

CV

INTERLOCK

PURGE

DIGITAL

RUN IN

DISPLAY

BOARD

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GENERAL DESCRIPTION

Several models of the LN-25™ PRO are offered to best meet the individual welders needs. The Extra Torque model features additional torque for reliable feeding of large diameter FCAW wire. The standard and control cable models feature wire drive gearing for optimal per- formance with both FCAW and GMAW wires of com- mon sizes. All the models include a gas solenoid and flow meter for the flexibility to run most wire processes. Control Cable models also includes digital meters and remote voltage control.

The plastic case is molded from high impact, flame retardant plastic for durability and low weight. The patent pending design keeps the internal components protected and dry.

The heart of the LN-25™ PRO is a 2 roll MAXTRAC wire drive system. The patented features on the wire drive offer tool-less changing of the drive rolls and wire guides for quick changeovers. A tachometer controlled motor powers the patent pending drive rolls for smooth, steady feeding without slippage.

With only one p.c. board, the LN-25™ PRO is designed to be simple, reliable and easy to service. The p.c. board is manufactured with Lincoln’s industry leading environmental design protection which involces mount- ing the board in a plastic tray and potting it with epoxy.

With a 325 amp, 100% duty cycle rating, these feeders are ready for heavy duty welding.

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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion

LN-25™ PRO