Lincoln Electric DC-400 specifications Remote Control Check, Power Diode Test

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E-6

 

TROUBLESHOOTING

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REMOTE CONTROL CHECK

2. Power Diode Test

 

Disconnect the remote output control and connect an ohmmeter across 75 to 76 and rotate the rheostat in the remote control. The resistance reading should go from zero to 10K ohms. Repeat with ohmmeter across 75 and 76 with same results. Connect ohm- meter across 75 and 77. The reading should be 10K ohms. A lower reading will indicate a shorted or par- tially shorted rheostat. A very high reading will indi- cate an open rheostat. In either of the last two cases, replace rheostat. Check cable for any physical dam- age.

POWER RECTIFIER BRIDGE ASSEMBLY CHECKING PROCEDURE

a)Establish the polarity of the ohmmeter leads and set to X10 scale.

b)Connect the ohmmeter positive lead to anode and negative lead to cathode.

c)Reverse the leads of the ohmmeter from Step b.

d)A shorted diode will indicate zero or an equally low resistance in both directions. An open diode will have an infinite or high resistance in both directions and a good diode will have a low resistance in Step b and Step a much high- er resistance in Step c.

WARNING

ELECTRIC SHOCK can kill.

•Have an electrician install and service this equipment.

•Turn the input power off at the fuse box before working on equipment.

•Do not touch electrically hot parts.

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1.Bridge and Device Isolation (See the instruc- tion manual parts list for the exact location.)

Disconnect the following leads from the bridge, shown in Diagram 1:

a)Unplug P3 (G1, G2, G3 and 204) from the Control PC Board.

b)Unplug P5 from the Snubber PC Board.

c)Secondary leads X1, X2, and X3 from the anodes of the SCR’s and cathodes of the diodes.

d)Disconnect positive bridge lead from shunt and positive capacitor bank lead and from lug with triple 204 leads.

e)Perform the following steps 2 and 3. If diodes and SCR’s are not shorted, bridge test is com- pleted. If any device appears shorted, discon- nect the cathode lead of each diode (4 total) and repeat Steps 2 and 3.

3.Power Silicon Controlled Rectifier Test

a)Connect the ohmmeter (set to m X10 scale) leads to the anode and cathode.

b)Reverse the leads of the ohmmeter from Step a.

c)A shorted SCR will indicate zero or an equally low resistance in one or both directions.

d)Establish the polarity of the ohmmeter. Connect the positive lead to the gate and the negative lead to the cathode.

e)An open gate circuit will have an infinite or high resistance. A good gate circuit will read a low resistance, but not zero ohms. If gate circuit reads zero ohms, check gate harness for shorts between gate leads and 204 before replacing SCR.

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

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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 Vii Section DSection E 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 IP214OPERATIONB-4 Earth Ground ConnectionSignifying the Earth Ground Connection DC-400 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 ConnectionsAccessories Factory Installed OptionsField 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.

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