Lincoln Electric SVM188-A service manual NA-3 Automatic Wire Feeder, Remote

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B-8

OPERATION

B-8

NA-3 AUTOMATIC WIRE FEEDER

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1.Set the DC-600 LOCAL/REMOTE Switch to REMOTE. Set the OUTPUT TERMINALS switch to REMOTE. NOTE: Later model NA-3 automatic wire feeders are capable of cold starts when the NA-3 Mode switch is in the CV or CC mode position. Some earlier models are capable of cold starting only in the CC mode position. Cold starting enables you to inch the wire down to the work, automatically stop, and automatically energize the flux hopper valve.

2.Connect the NA-3 Control Cable to the 14 pin Amphenol of the DC-600.

3.Connect the #21 work lead (on T.S.2) to the same polarity as the work cable connection or follow instructions on the Connection Diagram (S22978) for remote connection (recommend- ed) of the #21 lead.

4.Connect the electrode cables to terminal polarity to be used.

5.Set the DC-600 welding mode switch for the desired process: CV SUBMERGED ARC, CV INNERSHIELD mode or CC STICK mode.

6.Set the NA-3 mode Switch Position to either CV or CC to match the DC-600 mode selected in step 2.

7.Refer to the NA-3 operators manual for instructions on how to use the NA-3 in conjunction with the DC- 600.

8Follow the following guidelines for good arc striking detailed below for each welding mode.

DC-600 POWER SOURCE SETTING WHEN CONNECTED TO NA-5 WIRE FEEDER

When using the DC-600 with the NA-5 wire feeder, set the controls on the DC-600 as follows for the best per- formance:

1.Turn OFF main AC input power supply to the DC- 600.

2.Connect the NA-5 Control Cable to the 14 pin Amphenol of the DC-600.

3.Connect the #21 work lead (on T.S.2) to the same polarity as the work cable connection or follow instructions on the Connection Diagram (S22979) for remote connection (recommend- ed) of the #21 lead.

4.Connect the electrode cables to terminal polarity to be used.

5.Connect the #21 work lead (on T.S.2) to the same polarity as the work cable connection.

6.Set the DC-600 LOCAL/REMOTE Switch to

REMOTE.

7.Set the DC-600 OUTPUT TERMINALS switch to

REMOTE.

8.Set the DC-600 WELDING MODE SWITCH to the position that matches the welding process being used.

•For submerged arc welding, set WELDING MODE SWITCH to CV SUBMERGED ARC position.

•For all open arc welding processes set WELDING MODE SWITCH to CV INNERSHIELD position.

GOOD ARC STRIKING GUIDELINES FOR THE DC- 600 IN THE CV INNERSHIELD, CV SUBMERGED ARC MODES

Following are some basic arc striking techniques that apply to all wire feed processes. Using these proce- dures should provide trouble-free starting. \These pro- cedures apply to single, solid wires and Innershield wires.

1.Cut the electrode to a sharp point.

2.Set the NA-3 Open Circuit Voltage Control (NA-5 STRIKE VOLTS Control) to the same dial setting as the Arc Voltage Control. For the NA-3, If this is a new welding procedure, a good starting point is to set the Open Circuit Voltage Control to # 6.

NOTE: The open circuit voltage of the DC-600 varies from approximately 16 volts to 56 volts in the CV INNERSHIELD or CV SUBMERGED ARC modes. The open circuit volt- age is constant in the CC STICK mode.

DC-600

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Contents DC-600 ISAFETYi Fumes and Gases SafetyElectric Shock can kill Can be dangerousPowered equipment For ElectricallyPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcElectromagnetic Compatibility EMC Safety Master Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications DC-600Select Proper Location Safety PrecautionsElectric Shock can Kill Ground Connection Fuse and Wire SizesElectrical Input Connections Reconnect Procedure Connection for Highest Rating Plate VOLTAGE, 50 or 60 HZConnection for 440 Volts 50 or 60 HZ V 60HZ See Machine Rating Plate for Required Input Supply Voltage Connections Output ConnectionsELECTRODE, Work and #21 Lead Terminal Strip 2 T.S.2 Auxiliary Power Control ConnectionsTerminal Strip 1 T.S.1 DC-600 Table of Contents Operation Section Safety Precautions OperationRecommended Processes and Equipment Design Features AdvantagesGeneral Description Welding Capability Meanings of Graphical Symbols on Case FrontOFF Input Power Output Control Output Voltage CurrentMeaning of Graphical Symbol for Ground CON- Nection Controls and SettingsAuxiliary Power in MS-RECEPTACLE OVERLOAD, OVERCURRENT, and Fault ProtectionOperating Steps Remote Control of Machine OperationWelding Procedure Recommendations NA-3 Automatic Wire Feeder RemoteLN-8 or LN-9 SEMI-AUTOMATIC Wire Feeder LN-7 and Other Constant Wire FeedersDC-600 Table of Contents Accessories Section Factory or Field Installed Options AccessoriesWire Feeders and Tractors Field Installed OptionsFigure C.2 MULTI-PROCESS Switch Cable Connections Accessories Table of Contents Maintenance Section Routine and Periodic Maintenance MaintenanceSafety Precautions Electric Shock can Kill 1TABLE of CONTENTS-THEORY of Operation Section E-1 Theory of Operation Input Circuit and Main TRANS- FormerFiring Board Firing CIRCUIT, Control CIR- Cuit and RectificationRectification Thermal Protection SCR Operation DC-600 1TABLE of Contents Troubleshooting and Repair F-1 2TROUBLESHOOTING and REPAIRF-2 HOW to USE Troubleshooting GuideTroubleshooting and Repair PC Board Troubleshooting ProceduresControl Feeder. See Protective Devices Check all three phase input Output Control J1,Pin2. See Wiring Diagram Wiring Diagram Materials Needed PC Board Troubleshooting GuideTest Description PC Board Troubleshooting Guide Control Board Figure F.2 Control Board LEDsDC-600 Internal Trigger Circuit Test Procedure Internal Trigger Circuit TestInternal Trigger Circuit Test 75 76DC-600 Firing Board Test Firing Board Test Control Board Test Control Board Test Figure F.7 Control BoardMain Transformer Voltage Test Main Transformer Voltage Test Figure F.8 Input Contactor and Reconnect PanelFigure F.9 Transformer Secondaries Main Transformer Voltage Test Control Transformer Test Procedure Control Transformer TestInput Contactor Test Input Contactor Test Voltage TestSCR Bridge Test Anode Cathode Remove Insulating Paint SCR Bridge TestActive Test Scope Settings Maximum Output Setting no Load Minimum Output Setting no Load 35TROUBLESHOOTING and REPAIRF-35 2V/Div Volts DC-600 Input Contactor CR1 CLEANING/REPLACEMENT Contactor Replacement Procedure Input Contactor CLEANING/REPLACEMENT ProcedureCleaning Procedure SCR Rectifier Bridge Removal and Replacement Procedure Removal Procedure 42TROUBLESHOOTING and REPAIRF-42Removal and Replacement Procedure SCR Rectifier BridgeReplacement Procedure Insulator Lock Washer Plain Washer Output Snubber LeadDC-600 Main Transformer and Choke Removal and Replacement Removal and Replacement Main Transformer and ChokeRemoval Procedure Weld Input Idle Amps and Watts Maximum Open Circuit VoltagesDC-600 Table of Contents Diagram Section Electrical Diagrams Wiring Diagram 230/460/575 Volt Machines G3506-1 Schematic Complete Machine G3575 Schematic Control PC Board G3408-1 Control PC Board Assembly G3409-1 Schematic Firing PC Board G3741-1
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