Lincoln Electric DC-400 Remote Control Check, Power Diode Test, Power RECTIFIER bRIDGE ASSEMbLY

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E-7

TROUbLESHOOTING

E-7

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 ser- vice 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.

CAUTION

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

IDEALARC® DC-400

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Contents Safety Depends on You Idealarc DC-400Safety Electric Shock can kill Welding and Cutting Sparks can Cause fire or explosion IiiPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcPlease Examine Carton and Equipment For Damage Immediately On-Line Product RegistrationTAbLE of Contents Technical Specifications DC-400 Safety Precautions Input Power ConnectionsFALLING EQUIPMENT can cause Correct Operational USEInstallation of Field Installed Options Output Cable ConnectionsOutput Cables Remote Output Control K857 or K857-1 with K864 AdapterK843 Amptrol Adapter Installation Instructions K870 AmptrolMultiprocess Switch Connection and Operation Purpose Connection of DC-400 to LN-22 or LN-25Design ConnectionsMultiprocess Switch STICK, TIG or AIR/CARbON ARCSafety Precautions ELECTRIC SHOCK can killOutput Terminals Switch Rating Plate Mode SwitchVoltmeter Switch ARC Force Control DialNEMA EW 1 IEC 60974-1 Rating PlateRecommended Processes & Equipment Operational Features & ControlsGeneral Machine Description Power Source Operation and Controls Duty Cycle and Time PeriodARC FORCE CONTROL Dial Effective only in CC mode ARC CONTROL SWITCH Effective only in CV FCAW/GMAW modeOUTPUT TERMINALS SWITCH Front View of 14-PIN Connector ReceptacleTerminal Strip Connections Machine and Circuit ProtectionAuxiliary Power Connections Remote Control ConnectionsCase Features Output ConnectionsMachine & Circuit Protection Thermal Protection Light Factory Installed Options Field Installed OptionsOptional Equipment TIG OptionsAmptrol ADAPTER CAbLE K843 HI-FREQUENCY KITK799 Codes 8634 and AbOVE only Undercarriages K817, K817R, K817P K8411MAINTENANCED-1 Routine MaintenanceTROUbLESHOOTING PRObLEMS SymptomsPOSSIbLE Cause Recommended Course of ActionOutput Control Local TROUbLESHOOTING TROUbLESHOOTING Connecting the Remote Control to the Machine Fault Protection OperationPower I/0 Switch Check Output VoltagePower Diode Test Power RECTIFIER bRIDGE ASSEMbLYCHECKING PROCEDURE Power Silicon Controlled Rectifier TestDiagrams Code is pasted inside Number 400 Wiring Diagram for Codes 10859, 10880,11083Idealarc DC Wiring Idealarc DC-400 Diagram for Code 9847Code is pasted inside Number Idealarc DC-400 Idealarc DC-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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