General Machine Description

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OPERATION

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The DC-400 is an SCR controlled three phase DC power source. It is designed with a single range potentiometer control.

RECOMMENDED PROCESSES & EQUIPMENT

The DC-400 model is designed for all open arc processes including Innershield® and GMAW all solid wire and gas procedures within the capacity of the machine, plus the capability of stick and TIG welding and air carbon arc gouging up to 5/16” (8mm) diame- ter. A mode switch selects CV (FCAW, GMAW), CV Submerged Arc, or CC (Stick/TIG). Stick welding per- formance is similar to that of the R3R-500.

The DC-400 is designed to be used with the LN-7, LN-

7GMA, LN-8, LN-9, LN-9 GMA, LN-23P, LN-25, or LN-742 semiautomatic wire feeders, the NA-3, NA-5 and NA-5R automatics, and the LT-56 and LT-7 trac- tors, within the 400 ampere capacity of the machine. The DC-400 Diode Kit option is required to utilize the cold start and cold electrode sensing features of the NA-3, NA-5 and NA-5R.

OPERATIONAL FEATURES & CONTROLS

ARC CHARACTERISTICS

Through the unique combination of the transformer, three phase semiconverter rectifier, capacitor bank, arc control choke, and the solid state control system, outstanding arc characteristics are achieved on con- stant voltage.

In addition, an arc force control enables the DC-400 to stick weld as well as the R3R-500.

OUTPUT CONTROL

The OUTPUT control, a small 2 watt potentiometer, is calibrated from 1 to 10. The OUTPUT control serves as a voltage control in the CV position and a current control in the CC position.

MACHINE OUTPUT CONTROL SWITCH “LOCAL” OR “REMOTE”

The machine output can be controlled by either the OUTPUT control on the machine control panel, the output control on the wire feed unit, or an optional “remote control” that is available. This switch selects the mode of control, either “LOCAL” or “REMOTE”.

OUTPUT TERMINALS “ON” OR OUTPUT TERMI- NALS “REMOTE”

This switch provides an alternative to the “2 to 4” jumpering function by energizing the machine’s output regardless of whether “2 or 4” is jumpered or not.

POLARITY SELECTION

Polarity selection is made by appropriately connecting the electrode and work welding cables to either the “+“ stud or to the “-” stud. Select “VOLTMETER” switch for “+” or “-” electrode, for the remote (#21) work sensing lead.

VOLTMETER SWITCH “+” ELECTRODE OR “-” ELECTRODE

This switch selects electrode polarity for the remote (#21) work sensing lead of automatic or semiautomat- ic equipment.

115 VOLT POWER SWITCH

The power input contactor operates from an auxiliary 115 volt transformer that is energized through the POWER toggle switch on the machine control panel. “ I “ is on and “0” is off.

PILOT LIGHT

A white light on the machine control panel indicates when the power source input contactor is closed. This means the main power transformer and all auxiliary and control transformers are energized.

THERMAL PROTECTION LIGHT

An amber light on the machine control panel indicates when either of the two protective thermostats have opened. Output power will be removed but input power will still be applied to the machine.

INPUT CONTACTOR

The power source is equipped with an input contactor.

IDEALARC® DC-400

DC-400 specifications

The Lincoln Electric DC-400 is a versatile and robust DC arc welding power source designed to meet the demands of various industrial applications. Known for its reliability and performance, the DC-400 is ideal for both professional welders and fabrication shops requiring robust equipment that can handle challenging welding tasks.

One of the main features of the DC-400 is its ability to provide a smooth, stable arc, which is essential for achieving high-quality welds. This welding machine is capable of delivering a wide amperage range, typically from 20 to 400 amperes, making it suitable for various welding processes, including MIG, TIG, and Stick welding. The unit's high output capabilities allow it to effectively weld a variety of materials, such as steel, stainless steel, and various alloys.

In terms of technology, the DC-400 integrates advanced power conversion technology that enhances energy efficiency while minimizing heat loss during operation. This not only contributes to lower operating costs but also ensures a longer service life for the machine. The DC-400 features a durable, rugged design, with a robust steel frame that can withstand the rigors of heavy industrial use while providing an IP23 rating for protection against moisture and dust.

Another notable characteristic of the DC-400 is its ease of use. The intuitive controls allow for quick adjustments to settings, enabling welders to easily adapt to different job requirements. The arc characteristics of the DC-400 can be fine-tuned to optimize performance for different welding applications, ensuring consistent results every time.

Moreover, the DC-400 is equipped with built-in safety features such as thermal overload protection, which prevents damage to the machine in case of prolonged operation under heavy loads. This feature enhances the safety of the operator and extends the life of the welding machine.

Overall, the Lincoln Electric DC-400 stands out as a reliable and efficient welding power source. Its combination of high-performance capabilities, advanced technology, and next-level usability makes it a popular choice in the industry. Whether for heavy fabrication, maintenance, or repair work, the DC-400 continues to prove itself as an indispensable tool for professional welders seeking quality and durability in their equipment.