Lincoln Electric DC-655 service manual Safety Precautions, Select Suitable Location

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A-4

A-4

INSTALLATION

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Read this entire installation section before you start installation.

SAFETY PRECAUTIONS

INPUT

CONTACTOR (CR1)

INPUT POWER SUPPLY

CABLE WITH BUSHING

OR BOX CONNECTOR

RECONNECT

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WARNING

ELECTRIC SHOCK can kill.

•Only qualified personnel should perform this installation.

•Turn the input power OFF at the disconnect switch or fuse box before working on this equipment.

•Turn the Power Switch on the DC-655 “OFF” before connecting or disconnecting output cables, wire feeder or remote connections, or other equipment.

•Do not touch electrically hot parts.

•Always connect the Idealarc DC-655 grounding ter- minal (located on the welder near the reconnect panel) to a good electrical earth ground.

SELECT SUITABLE LOCATION

Place the welder where clean cooling air can freely cir- culate in through the front louvers and out through the rear louvers. Dirt, dust or any foreign material that can be drawn into the welder should be kept at a mini- mum. Failure to observe these precautions can result in excessive operating temperatures and nuisance shut-downs.

STACKING

The DC-655 may be stacked three-high provided the bottom machine is on a stable, hard, level surface. Be sure that the two pins in the roof fit into the slots in the base of the DC-655 above it.

TILTING

Do not place the machine on a surface that is inclined enough to create a risk of the machine falling over.

ELECTRICAL

INPUT CONNECTIONS

Before installing the machine check that the input sup- ply voltage, phase, and frequency are the same as the voltage, phase, and frequency as specified on the welder nameplate.

PANEL ASSEMBL Y

FIGURE A.1 - ELECTRICAL INPUT CONNECTIONS

Use input wire sizes that meet local electrical codes or see the Technical Specifications page in this manual.

Input power supply entry is through the hole in the Case Back Assembly. See Figure A.1 for the location of the machine’s input cable entry opening, Input Contactor (CR1), and reconnect panel.

FUSE AND WIRE SIZES

Protect the input circuit with the super lag fuses or delay type circuit breakers listed on the Technical Specifications page of this manual for the machine being used. They are also called inverse time or ther- mal/magnetic circuit breakers.

DO NOT use fuses or circuit breakers with a lower amp rating than recommended. This can result in “nui- sance” tripping caused by inrush current even when machine is not being used for welding at high output currents.

GROUND CONNECTION

Ground the frame of the machine. A ground

terminal marked with the symbol is located inside the case back of the machine near the input contactor. Access to the input box assembly is at the upper rear of the machine. See your local and national electrical codes for proper grounding methods. Use grounding wire sizes that meet local electrical codes or see the Technical Specifications page in this manual.

IDEALARC DC-655

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Contents Idealarc DC-655 Safety California Proposition 65 WarningsElectric Shock can kill Cylinder may explode if damaged Précautions DE Sûreté Master Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications DC-655Input Power Three Phase Select Suitable Location Safety PrecautionsElectrical Input Connections Input Power Supply Connections Input Supply Connection DiagramOutput Connections Electrode and Work CablesAuxiliary Power Control Connections Auxiliary Power TableTerminal Strip 1 T.S.1 Terminal Strip 2 T.S.2Table of Contents Operation Section OPERATIONB-2 Operating InstructionsGeneral Description Design Features AdvantagesOperation Recommended Processes and EquipmentDC-655 Figure B.2 Lower Case Front Controls & Connections Machine Protection Auxiliary PowerCase Back Connections Thermal Shutdown Remote Control Leads Fault Protection SHUTDOWN1Over Current Protection Shutdown CC Mode ARC Force CC Mode ARC Gouging CV Mode CURRENT-LIMITINGCC Mode HOT Start Welding PerformanceTable of Contents Accessories Field Installed Options Remote Output ControlAutomatic Wire Feeders SEMI-AUTOMATIC Wire FeedersSet the Idealarc DC-655 Power toggle Accessories Semiautomatic Wire Feeders Connecting the LN-7 to the Idealarc DC-655 Terminal Strip GND Negative Positive Figure C.4 Idealarc DC-655 Table of Contents Maintenance General Maintenance Electric Shock can killFigure D.1 General Component Locations Idealarc DC-655 Table of Contents Theory of Operation Section Theory of Operation Down Circuits Protective Devices and Shutdown Circuits SCR Operation Figure E.4 SCR OperationIdealarc DC-655 Table of Contents Troubleshooting & Repair Section Troubleshooting & Repair HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures Troubleshooting Guide Board LED Chart ControlBridge Test LED ChartOutput Perform the SCR Bridge TestMain See the Idle Shut Down TimerTransformer Test Function Problems Thermal Fan/Snubber PC Troubleshooting & Repair Welding Problems Mode Current Limiting See the Control BoardTest Description Internal Trigger Circuit TestMaterials Needed Trigger Diagram Test ProcedureInternal Trigger Circuit Test Simplified Trigger Diagram. If a resistance SectionFigure F.3 Simplified Trigger Diagram Firing Board Test Firing Board Test Figure F.4 Firing Board Trigger Circuit Test Points and LEDsMain Transformer Test Figure F.5 14-PIN Receptacle Figure F.4 Main Transformer T1 Voltage Test Main Transformer T1 Voltage Test Figure F.6 Input Contactor and Primary LeadsTroubleshooting & Repair Figure F.8 Terminal Strip Figure F.9 Firing Board Plug J5 Pins Control Transformer T2 Test Control Transformer T2 Test Figure F.10 Control TransformerHigh Voltage is present at Control Board Transformer T3 Test Control Board Transformer T3 Test Perform the Control Transformer T2 TestInput Contactor Test Input Contactor Test Transformer T2 TestTest for Contact Continuity Figure F.13 Input Contactor Test ConnectionsStatic SCR Test Static SCR Test Figure F.15 Heat Sink Test Points Active SCR Test Active SCR Test Figure F.17 Heat Sink Test Points Anode Cathode Thermal FAN/SNUBBER Board LED Chart LED Functions and IndicationsControl Board LED Chart LED # LED Functions and IndicationsScope Settings Maximum Output Setting no Load Normal Open Circuit Voltage Waveform Constant Voltage MIGMinimum Output Setting no Load Troubleshooting & Repair Typical SCR Gate Voltage Waveform Constant Voltage MIG Installation Input Contactor CR1 CLEANING/REPLACEMENT DescriptionInput Contactor CR1 CLEANING/REPLACEMENT Cleaning ProcedureSCR Rectifier Bridge Removal Replacement Procedure Procedure Replacement ProcedureSCR Rectifier Bridge Removal Reassembly SCR Rectifier Bridge LEG Assembly Mounting BracketsMain Transformer and Choke Removal Replacement Procedure Main Transformer and Choke Removal Output Choke RemovalMain Transformer Removal Retest After Repair Input Idle Amps and WattsSVM Error Reporting Form Section G Electrical Diagrams Control Board Schematic G3384 Firing Board Schematic G2792 Thermal Fan/Snubber Board Schematic L10123 Control Board Layout G3385-1 Firing Board Layout G2699-2 Thermal Fan/Snubber Board Layout L10124-1 Return to Section TOC
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