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F-38

TROUBLESHOOTING & REPAIR

F-38

 

 

 

BRUSH AND SLIP RING SERVICE PROCEDURE (CONTINUED)

 

 

FIGURE F.8 – BRUSH & SLIP RING LOCATIONS

 

 

SLIP RINGS

BRUSHES

 

 

 

#200A

 

 

 

#200B

 

#201

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TEST PROCEDURE

1.Perform the Case Cover Removal Procedure

2.Examine brushes and slip rings. The slip rings, brush holder, and brushes should be clean and free from oil or grease. The brushes should be making good, continuous contact with the slip rings.

3.The brushes should be of sufficient length and have adequate spring tension. Generally, the brushes should be replaced if either brush has less than 1/4” remaining before it reaches the end of its travel. Spring tension should be suffi- cient to hold the brushes firmly against the slip rings.

4.The brushes should be removed from the brush holder and examined. The terminals should be clean. The shunt, (braided lead connecting the carbon brush to the terminal) should be in good condition and firmly connected to the carbon brush and to the connection terminal.

5.If the slip rings are discolored, display evidence of excessive sparking, or the brushes have worn prematurely; these may be signs of a grounded or shorted rotor. Perform the rotor resistance test.

6.Check for evidence of sticking brushes. Sticking brushes will normally result in the slip rings being pitted and discolored from excessive arc- ing. Another sign of sticking brushes is instabili- ty or loss of both weld and auxiliary output, but the machine may begin to work properly, for a short time, after being jarred or moved.

7.If there is any evidence that the brushes may have been sticking in the brush holders, a new brush holder and brush assembly should be installed.

Cleaning slip rings:

1.In the event that the slip rings have become dirty, discolored or mildly pitted, it will be neces- sary to clean them, using very fine, 500 or 600 grit sand paper or a 220 or 320 grit commutator stone.

Seating Brushes:

1.If brushes have been replaced, repositioned, or are not making full contact with the slip rings, it may be necessary to re-seat them. This can be done by placing a strip of 180 grit sandpaper between the slip rings and the brushes, with the abrasive side against the brushes. Pull the sandpaper strip around the circumference of the slip rings in the direction of rotor rotation only. Repeat this procedure until the surface of each brush is in full contact with its matching slip ring.

2.Use a low pressure compressed air to thorough- ly blow the carbon, commutator stone, and sandpaper dust from the machine before operat- ing.

3.Perform the Case Cover Replacement

Procedure

Note: See Figure F.8 for general locations.

VANTAGE® 400

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Lincoln Electric 400 service manual Cleaning slip rings, Seating Brushes
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400 specifications

The Lincoln Electric 400 is a state-of-the-art multi-process welding machine designed to meet the demands of today’s industrial welding applications. Renowned for its reliability and versatility, this welder is a preferred choice among professionals in fabrication, construction, and maintenance industries.

One of the main features of the Lincoln Electric 400 is its multi-process capability. It seamlessly integrates MIG, TIG, and stick welding processes into a single unit, allowing users to switch between methods depending on the job at hand. This flexibility makes it incredibly suitable for a wide range of materials, including steel, stainless steel, and aluminum.

The welding machine boasts a robust power output, with a maximum range of 400 amps. This impressive capacity enables it to handle thick materials effectively, making it ideal for heavy-duty tasks. The machine operates on both single-phase and three-phase power, giving users the advantage of versatility depending on the power source available at the job site.

Another significant characteristic of the Lincoln Electric 400 is its advanced digital display and control interface. This user-friendly panel allows for easy adjustments to voltage and wire feed speed, ensuring precision and high-quality welds. Additionally, the machine includes built-in features to improve the consistency of welding, such as the Smart MIG technology which optimizes the welding parameters automatically based on the wire diameter and material thickness.

In terms of durability, the Lincoln Electric 400 is designed for rugged environments. Its heavy-duty construction, including a robust metal casing and protective features, ensures it can withstand the rigors of daily use in harsh conditions. Furthermore, the welder is often praised for its efficient cooling system, which prolongs the machine's lifespan and maintains optimal performance even during extended usage.

Portability is another key aspect of this welding machine. Weighing under 200 pounds, it is designed with mobility in mind. The integrated wheels allow for easy transportation between job sites, making it a practical choice for mobile welders and contractors.

In conclusion, the Lincoln Electric 400 stands out in the welding equipment market due to its multi-process capabilities, impressive power output, user-friendly interface, durability, and portability. It is engineered to exceed the expectations of professional welders, providing them with the tools needed for high-quality results across a variety of applications.
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