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OPERATION

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AUXILIARY POWER CONNECTIONS

The power source is equipped to furnish nominally 110-115 volt AC and 40-42 volt AC auxiliary power for operating wire feeding equipment, etc. The auxiliary power is available at the 14-pin MS-style connector receptacle on the control panel and/or at a terminal strip behind the hinged control panel on the front of the power source. 110-115V AC is available at recep- tacle pins A and J (Domestic and Export models only), and terminals 31 and 32 (all models). 40-42V AC is available only at receptacle pins I and K. The 110- 115V AC and the 40-42V AC are isolated circuits and each is protected by a 10 amp circuit breaker.

REMOTE CONTROL CONNECTIONS

Remote control connections are available both at a 14-pin connector receptacle located on the control panel, and on terminal strips with screw connections located behind the hinged control panel on the front of the power source.

OUTPUT CONNECTIONS

The output terminals are recessed on the case front and labeled “+” and “-”.

INPUT CONNECTIONS

The three input lines are brought in through the rear panel of the power source and attached to the input contactor. Removal of the removable access panel makes the contactor accessible for the input cable connections.

INPUT LINE VOLTAGE COMPENSATION

The power source is equipped with input line voltage compensation as standard. For a line voltage fluctua- tion of ±10% the output will remain essentially con- stant. This is accomplished through the feedback net- work in the control circuit.

SOLID STATE OUTPUT CONTROL

The output of the welder is electronically controlled by SCR’s instead of mechanical contactors, providing extra long life for highly repetitive welding applica- tions.

SOLID STATE CONTROL SYSTEM

The control circuitry consists of six basic circuits: (1) the SCR snubber network, (2) the SCR firing circuit,

(3)the control/fault protection circuit, (4) the starting circuit, (5) the power-up delay circuit, and (6) the power circuit.

The SCR snubber board consists of a capacitor and resistor connected across each SCR and across the entire bridge and MOV’s to protect the control circuitry and SCR’s from transient voltages. The snubber board is mounted on the back of the case front.

The SCR firing circuit, the control fault protection cir- cuit, the power-up delay circuit, and the power circuit are mounted on the control PC board located behind the front control panel. (The front control panel hinges down for easy access to the board.)

The starting circuit board is located on the back of the control box.

MACHINE COOLING

The fan pulls air in through the louvered front of the machine over the internal parts and exhausts out the louvered rear of the machine. The fan motor is fully enclosed, has sealed ball bearings, requires no lubri- cation, and operates when the power switch is turned on.

CASE FEATURES

The machine uses a 32” (813mm) long base. The low profile case facilitates installation of the machine under a workbench and stacking the machines three high to conserve floor space.

The case front incorporates a recessed control panel where all the machine controls are mounted. This recessed panel protects the controls and minimizes the possibilities of accidental contact. This control panel can be easily opened to permit access to the enclosed control section which contains the terminal strips, PC board, etc.

The output lead terminals are also recessed to avoid any object or person accidentally coming in contact with an output terminal. Strain relief is provided by holes in the front of the base. The leads are routed up through these holes to the output terminals. This pre- vents any damage of the output studs or insulation of same in the event the cables are pulled excessively. An output stud cover protects against accidental con- tact with the output studs. Cover hinges upward for access to the studs.

The individual case sides are removable for easy access for internal service or inspection. These are removable even though the machines are stacked three high.

IDEALARC® DC-400

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Lincoln Electric DC-400 Auxiliary Power Connections, Remote Control Connections, Output Connections, Input Connections
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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.
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