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Lincoln Electric SVM148-B service manual Return to

Models: SVM148-B

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Section TOC

Master TOC

E-5

E-5

THEORY OF OPERATION

FIGURE E.5 – OUTPUT BRIDGE, CHOKE, POLARITY SWITCH, OUTPUT CONTACTOR

AND OUTPUT TERMINALS

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RANGE

SWITCH

RANGER 300 DLX

AC

OUTPUT RECTIFIER BRIDGE

PART OF CHOKE RANGE

SWITCH

POLARITY SWITCH

WORK

TERMINAL

REACTOR

SHUTDOWN

SOLENOID

AC

CAPACITORS

cv output

contactor

ELECTRODE TERMINAL

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STATOR

GLOW PLUGS

ENGINE

MECHANICAL

ROTOR

ROTOR

 

ROTATION

STARTER

SLIP

 

MOTOR

 

RINGS

OIL &

WATER

SENSORS

IDLER

SOLENOID

ALTERNATOR

FIELD

115 & 230VAC

BRIDGE

RECEPTACLES

BATTERY

PRINTED

CIRCUIT

BOARD

FIELD

CAPACITOR

BY-PASS

BOARD

CONTACTOR CLOSURE

CONTACTOR CLOSURE

OUTPUT

CONTROL

REMOTE

SWITCH

42VAC

115VAC

6 PIN

14 PIN

AMPHENOL

AMPHENOL

 

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OUTPUT BRIDGE, CHOKE, POLARITY SWITCH, OUTPUT CONTACTOR AND OUTPUT TERMINALS

The AC voltage developed in the stator weld winding is delivered, through the reactor and range switch, to the output bridge and polarity switch. Depending upon the setting of the polarity switch, either AC volt- age or DC voltage is delivered to the output terminals. If AC output is selected, the current path is from the stator weld winding through the reactor, range switch, and polarity switch; through the output contactor to the output terminals. If a DC output is called for, the current path is through the output rectifier bridge,

where the AC voltage is rectified to a DC voltage; and then to the choke, where the DC output is filtered. The filtered DC current path is through the polarity switch and output contactor to the output terminals.

When a CV (constant voltage) is desired, the reactor is passed by. The range switch applies a lower AC volt- age to the rectifier bridge. The DC output of the bridge is filtered and “stiffened” by the capacitors. This lower but “stiffer” DC output is passed through the tapped portion of the choke, the polarity switch, and output contactor to the output terminals.

In the Ranger 300DLX machines, the output contactor is in series with the electrode terminal and must be energized (closed) to provide welding voltage at the output terminals.

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

RANGER 300 D AND 300 DLX

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Lincoln Electric SVM148-B service manual Return to
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SVM148-B specifications

The Lincoln Electric SVM148-B is a state-of-the-art inverter-based power source designed for both professional welders and hobbyists. As a versatile machine, it excels in a variety of welding applications including MIG, TIG, and stick welding. This machine is particularly notable for its efficiency and portability, making it an ideal choice for on-site projects or workshops where space is limited.

One of the main features of the SVM148-B is its inverter technology. Unlike traditional transformer-based welders, inverter welders are typically lighter and more compact. This means that users can transport the machine more easily without sacrificing power or performance. The SVM148-B is capable of delivering a substantial amperage range, allowing for adjustments that suit various materials and thicknesses, from thin sheet metal to thicker plates.

The machine offers adjustable output levels, providing precise control over the welding process. This level of control is essential for achieving clean, strong welds and is especially useful when working with different materials. The SVM148-B is equipped with digital display features that provide real-time feedback on power settings and welding parameters, allowing welders to make quick adjustments as needed.

Another significant advantage of the SVM148-B is its duty cycle, which is designed to accommodate extended usage without overheating. A robust duty cycle means that professionals can rely on this machine for prolonged periods, making it a dependable choice for heavy-duty tasks.

The SVM148-B also includes advanced safety features such as overload protection, which ensures that the machine will shut down in the event of excessive current draw. This feature not only protects the equipment but also enhances user safety during operation.

Moreover, the machine is compatible with a wide variety of welding wires and electrodes, adding to its versatility. Whether you're working with stainless steel, aluminum, or mild steel, the SVM148-B can adapt seamlessly.

In conclusion, the Lincoln Electric SVM148-B combines advanced inverter technology with user-friendly features, making it an invaluable addition to any welding setup. Its portability, control options, robust duty cycle, and safety measures set it apart as a reliable and efficient welding solution for professionals and hobbyists alike. Whether for a small workshop or large industrial applications, the SVM148-B meets the demands of modern welding with efficiency and ease.