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E-3

THEORY OF OPERATION

 

 

FIGURE E.2 - CONTROL CIRCUITS

 

 

 

 

 

SPOOL

WIRE

 

 

 

 

 

 

GAS

GUN

SPEED

 

 

 

 

 

 

SOLENOID

SWITCH

CONTROL

 

 

 

 

 

 

 

 

WIRE

 

 

 

 

 

 

 

 

DRIVE

 

 

 

 

 

 

 

 

MOTOR

 

 

 

CIRCUIT

115V

 

CONTROL BOARD

 

 

 

BREAKER

RECEPTACLE

 

 

 

 

 

 

FAN

 

 

 

 

 

 

 

 

MOTOR

 

 

 

 

 

 

TRANSFORMER

OUTPUT BRIDGE

 

 

 

 

 

 

TACH

 

 

 

V

 

 

FEEDBACK

THERMOSTAT

THERMOSTAT

 

 

 

 

CONTACTOR CONTROL

 

 

 

 

.8

 

 

 

 

 

 

 

 

 

 

 

LINE

 

27

AC

TAP SELECTOR

GUN TRIGGER

 

 

SWITCH

 

 

 

 

 

 

 

 

 

SWITCH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTPUT DIODE

 

 

 

 

 

 

 

 

BRIDGE

 

 

 

 

 

 

 

 

+

+

 

 

 

 

 

 

 

OUTPUT

POSITIVE

 

 

 

 

 

 

CHOKE

 

 

 

 

 

 

TERMINAL

 

 

 

 

 

 

 

 

 

 

 

 

CONTACTOR

OUTPUT

 

 

 

 

 

 

 

 

CAPACITORS

 

 

RECONNECT

 

 

 

 

 

-

-

 

 

MAIN

 

 

 

 

NEGATIVE

PANEL

TRANSFORMER

 

 

 

 

 

 

 

 

TERMINAL

 

 

 

 

 

 

 

OUTPUT RECTIFICATION, CONTACTOR

AND CONTROL BOARD

The AC voltage developed on the secondary winding is applied, through the selector switch and output contactor, to the output rectifier bridge. This DC welding voltage is filtered by the output capacitors and applied to the output terminals and welding gun. Since the output choke is in series with the positive leg of the output rectifier and also in series with the gun and welding load, a filtered constant voltage output is applied to the output terminals of the machine.

NOTE: Unshaded areas of Block Logic

Diagram are the subject of discussion

Power MIG® 215XT

E-3

GUN

ASSEMBLY

Page 35
Image 35
Lincoln Electric 11521 service manual Output RECTIFICATION, Contactor Control Board

11521 specifications

The Lincoln Electric 11521 is a highly regarded choice among welders and metal fabricators, known for its reliability and efficiency. This portable MIG welder excels in delivering professional-grade results, making it suitable for both beginners and experienced welders. One of the standout features of the Lincoln Electric 11521 is its user-friendly design, which facilitates ease of use and enhances the overall welding experience.

Equipped with a powerful 180 amp output, the Lincoln Electric 11521 is capable of tackling a wide range of welding applications. It operates on a standard 230-volt outlet, allowing users to work on various materials, including mild steel, stainless steel, and aluminum, with thicknesses up to 5/16 inch. This versatility is crucial for those who handle different types of projects, from automotive repairs to home improvement tasks.

The welder employs a spool gun for welding aluminum, ensuring a smooth and efficient feeding of the wire. This technology mitigates the problems commonly associated with feeding aluminum wire through a regular gun, providing a seamless experience. Additionally, the Lincoln Electric 11521 features an adjustable welding speed and voltage, enabling users to fine-tune their settings to match the specific requirements of each project. This adaptability leads to better penetration, bead shape, and overall weld quality.

Another important aspect of the Lincoln Electric 11521 is its durability. Constructed with high-quality materials, this welder is designed for tough jobs and can withstand the wear and tear associated with heavy use. The unit's compact size and lightweight design further enhance its practicality, making it easy to transport between job sites or store when not in use.

Safety is a crucial element in welding, and the Lincoln Electric 11521 does not compromise on this aspect. It features a thermal overload protection system, which prevents damage to the machine by shutting it down in case of overheating. The welder also includes a gas-saving mode that intelligently reduces the gas flow during idle times, maximizing efficiency.

In summary, the Lincoln Electric 11521 is a versatile and reliable MIG welder that caters to a wide range of welding needs. With its powerful output, user-friendly features, advanced technologies, and robust safety mechanisms, it is an excellent investment for professionals and hobbyists alike looking to achieve high-quality welds with ease.