Lincoln Electric DC-400 specifications Contact your local Authorized Field Service Facility

Page 29

E-2

TROUBLESHOOTING

E-2

 

 

 

 

Observe all Safety Guidelines detailed throughout this manual

 

 

 

 

PROBLEMS

(SYMPTOMS)

POSSIBLE

CAUSE

RECOMMENDED

COURSE OF ACTION

Input contactor (CR1) chatters.

1.

Faulty input contactor (CR1).

 

 

Repair or Replace.

 

2.

Low line voltage.

 

 

Check input power.

 

 

 

Machine input contactor does not

1.

Supply line fuse blown. Replace if

operate.

 

blown - look for reason first.

 

2.

Contactor power circuit dead.

 

 

Check control transformer T2 and

 

 

associated leads.

 

3.

Broken power lead. Check input

 

 

voltage at contactor.

 

4.

Wrong input voltage. Check volt-

 

 

age against instructions.

 

5.

Open input contactor coil.

 

 

Replace coil.

 

6.

POWER “I/0” switch (S1) not

 

 

closing. Replace switch.

 

 

 

Machine input contactor operates,

1.

Trigger circuit between #2 and #4

but no output when trying to weld.

 

leads is not being closed. Make

 

 

sure trigger circuit is being

 

 

closed.

 

2.

Electrode or work lead loose or

 

 

broken. Repair Connection.

 

3.

Open main transformer (T1) pri-

 

 

mary or secondary circuit. Repair.

 

4.

Defective Control PC Board.

 

 

Replace. See Procedure for

 

 

Replacing PC Boards.

 

5.

Primary or secondary thermostats

 

 

open. Amber thermal protection

 

 

light is on: Check for overheat-

 

 

ing; make sure fan is operating

 

 

and there is no obstruction to free

 

 

air flow.

 

 

Machine has minimum output and

1. Terminals 75, 76 or 77 grounded

no control.

 

to positive output.

 

 

 

If all recommended possible areas of misadjustment have been checked and the problem persists,

Contact your local Authorized Field Service Facility.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

DC-400

Image 29
Contents 10699 11038 11085 11128 11347 RED-D-ARC DC-400California Proposition 65 Warnings SafetyElectric Shock can kill Iii Welding Sparks can cause fire or explosionSûreté Pour Soudage a L’Arc Précautions DE SûretéOn-Line Product Registration Please Examine Carton and Equipment For Damage ImmediatelyTable of Contents Section E ViiSection D Technical Specifications DC-400 InstallationOutput Maximum Open Circuit Voltage Auxiliary Power Height Width Depth WeightCable Machine Load400A 100% 500A 50% Duty Lengths CycleRemote Control Adapter Cable K864 Multiprocess Switch K804-1 Connection of DC-400 to LN-22 or LN-25 Multiprocess Switch Connection and Operation PurposeDesign OperationRemote Control Connections Auxiliary Power ConnectionsCase Features Output ConnectionsMachine & Circuit Protection Thermal Protection Light STICK, TIG or AIR/CARBON ARC Multiprocess SwitchElectric Shock can kill OperationOutput Terminals Switch ARC Control SwitchVoltmeter Switch Rating Plate ARC Force Control DialDegree of protection provided by the enclosure IP21Signifying the Earth Ground Connection DC-400 4OPERATIONB-4Earth Ground Connection Recommended Processes & Equipment Voltmeter Switch Power Source OperationDuty Cycle and Time Period Duty Cycle Amps VoltsARC Control Switch Effective only in CV FCAW/GMAW mode ARC Force Control Dial Effective only in CC modeFront View of 14-PIN Connector Receptacle PIN Lead no FunctionMachine and Circuit Protection Terminal Strip ConnectionsField Installed Options AccessoriesFactory Installed Options Undercarriages K817, K817R, K841 HI-FREQUENCY KIT K799 Codes 8634 and Above onlyRoutine Maintenance 1MAINTENANCED-1HOW to USE Troubleshooting Guide TroubleshootingContact your local Authorized Field Service Facility Output Control Local Your local Authorized Field Service FacilityConnecting the Remote Control to the Machine Procedure for Replacing PC BoardsFault Protection Operation Power I/0 Switch CheckPower Diode Test Remote Control CheckPower Rectifier Bridge Assembly Checking Procedure Power Silicon Controlled Rectifier TestWiring Diagram for Code DiagramsPasted inside Number Wiring Diagram for Code 10699 and Above11085, 11128 Power Rectifier Bridge Diagram Type M12244-7 DC-400 32.00 15.39 30.92 30.02 +.11 Dimension PrintDC-400 Precaucion Warnung
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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.