Lincoln Electric SVM100-A service manual Case Front Controls, Load

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B-7

OPERATION

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7.CONTROL PANEL: The display is divided into five sections. See Figures B.2.a and B.2.b.

FIGURE B.2.a - DISPLAY

DC BA

E

A. AC/DC INDICATOR

D. MOMENTARY DISPLAY

B. VOLTMETER

E. BAR GRAPH

C. AMMETER

 

FIGURE B.2.b - DISPLAY

A.AC/DC INDICATOR: This symbol represents the output polarity of the 255 . . . either AC or DC. AC is shown in Figure B.2.a; DC is shown in Figure B.2.b.

and on the Momentary Display. When the Momentary Display is blank (as in Figure B.2.a), the Bar Graph Display represents values shown on the ammeter. When a low value is shown on the ammeter, only a few “bars” will appear on the left hand side of the Bar Graph Display. As the ammeter value increases, more and more “bars” will appear. Whenever a value increases, more and more “bars” will appear. Whenever a value appears in the Momentary Display, the Bar Graph Display will represent the Momentary Display value, not the ammeter value.

CASE FRONT CONTROLS

Refer to Figure B.3 for the location of the following controls:

1.POWER SWITCH: Controls the input power to the Square Wave TIG 255.

2.OVER TEMPERATURE LIGHT: A yellow light which only lights when an over temperature situation occurs. See the Maintenance Section for more information on the thermostatic protection.

3.POLARITY SWITCH: Selects DC+, AC or DC- welding polarity. DO NOT SWITCH UNDER

LOAD.

FIGURE B.3 - CASE FRONT CONTROLS

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B.VOLTMETER: This meter displays open circuit voltage as well as welding voltage, as measured on the output studs of the Square Wave TIG 255.

C.AMMETER: The ammeter can display preset current (for setting the welding current before welding) and actual welding current (the value of the welding current during a weld).

D.MOMENTARY DISPLAY: This area is blank under most conditions; see Figure B.2.a. Different val- ues may be displayed here as certain keypad keys are pressed. See Figure B.2.b; the TIG Pulser is being adjusted, so the Pulse Frequency, 2.0 Hz, is being displayed. Information in the Momentary Display lasts for five seconds after a key is pressed. Read the complete Operating Instructions section for more information on the values that appear in the Momentary Display.

E.BAR GRAPH DISPLAY: This area provides a graphical display of values shown on the Ammeter

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1.POWER SWITCH

2.THERMOSTATIC PROTECTION LIGHT

3.POLARITY SWITCH

SQUARE WAVE TIG 255

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Contents Square Wave TIG Safety Electric Shock can killARC Rays can burn Fumes and Gases can be dangerousCylinder may explode if damaged Welding Sparks can cause fire or explosionElectric and Magnetic Fields May be dangerousPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Table of Contents Installation SectionInstallation Technical Specifications Square Wave TIGSafety Precautions High Frequency Interference ProtectionSelect Suitable Location StackingInput Supply Connections Input ConnectionsGround Connection TIG Torch Connection Reconnect ProcedureOutput Connections Table A.1 Stick Electrode Cable ConnectionOperation Section Operation Operating InstructionsGeneral Warnings Fumes and GasesSection TOC Polarity Do not Switch AC & DC Recti Fier Power Source While Weld ING TIG Gtaw Single PhaseWork Connec Coolant Tion OutputDesign Features Advantages Operational Features and ControlsGeneral Description Recommended Processes and EquipmentWelding Capability LimitationsControls and Settings Control Panel KeysCase Front Controls LoadAccessory Operation TIG Welding Table B.1 Recommended Polarity Settings for TIG WeldingHand and Foot Amptrol Welding Operation TIG Welding GuidelinesSquare Wave TIG 255 12/95 TIG Welding Sequence Operation 2-STEP ModeTable B.2 Typical Current Ranges 1 for Tungsten Electrodes TIG Welding Sequence Operation 4-STEP Mode Auxiliary Power Advanced TIG Welding FeaturesALL Machines AC Wave Balance and Auto BalanceOverload Protection Square Wave TIG Accessories Section Accessories Options / AccessoriesInstallation of Field Installed Options Undercarriage FunctionMaintenance Section Maintenance MaintenanceRoutine and Periodic Maintenance Safety PrecautionsFigure D.1 General Assembly Exploded View Square Wave TIG Power Supply Block Logic Diagram Theory of Operation SectionTheory of Operation Input Line Voltage and Main TransformerOutput Rectification and Feedback Control High Voltage / High Frequency Circuit DC Welding Output DC Welding CircuitAC Welding Output AC Welding CircuitSCR Operation SCR Operation Square Wave TIGThermal Protection Troubleshooting & Repair Section 1TROUBLESHOOTING & Repair HOW to USE Troubleshooting GuideTroubleshooting & Repair PC Board Troubleshooting ProceduresTroubleshooting Guide Output Problems12/95 Square Wave TIG Troubleshooting & Repair Recommended Course of Action Problems SymptomsPossible Areas of Misadjustments Function Problems Troubleshooting Guide Troubleshooting & Repair TIG Mode Problems Troubleshooting & Repair Troubleshooting Guide TIG Welding Problems Troubleshooting & Repair Stick Welding Problems PC Board Connector Locations Figure F.1 Control Board ConnectorsMaterials Needed Control Transformer T2 Voltage TestTest Description Test Procedure Control BOXControl Transformer T2 Voltage Test Figure F.4 Control Board and TransformerPROTECTION/SNUBBER Board Continuity Test PROTECTION/SNUBBER Board Continuity Test Figure F.6 PROTECTION/SNUBBER Board Test Points Table F.6 Square Wave TIGARC Start Trigger Circuit Test ARC Start Trigger Circuit Test Figure F.9 PROTECTION/SNUBBER Board Test Points Static SCR Test Static SCR Test Figure F.11 Protection Board Plug LocationsActive SCR Test Active SCR Test Figure F.13 PROTECTION/SNUBBER Board Plug LocationsBattery Test Silicon Controlled Rectifier TestNormal Open Circuit Voltage Waveform DC Stick Mode Scope SettingsNormal Open Circuit Voltage Waveform AC Stick Mode Normal Open Circuit Voltage Waveform DC TIG Mode Normal Open Circuit Voltage Waveform AC TIG Mode Typical Output Voltage Waveform Machine Loaded DC TIG Mode Machine Loaded to 200 Amps AT 50 VDCMachine Loaded to 200 Amps AT 46 VAC AC TIG Mode Auto Balance onMachine Loaded to 50 Amps AT 26VAC Volts 5ms Typical SCR Gate Voltage WaveformVolts 2ms Troubleshooting & Repair FAN Motor and Blade Removal Tools RequiredFAN Motor and Blade Removal SCR Heat Sink Assembly Removal Materials RequiredSCR Heat Sink Assembly Removal Recommended Meters for Machine Output Tests Retest After RepairInput Idle Amps Retest After Repair cont’d Figure F.16 Transformer Lead Test PointsElectrical Diagrams Electrical Diagrams Control Board G2150 PTC1,PTC2 THERMISTOR-PTC,56 OHMS,90MAControl Board G2150 cont’d Square Wave TIG PROTECTION/SNUBBER Board L9255 CAPACITOR-CEMO,4700P,50V,10% Square Wave TIG Wiring Diagram Square Wave TIG Machine Schematic Square Wave TIG 6 a 0 a 7 a 8 a 3 CG2150 A C C TControl Board Schematic Square Wave TIG 255 cont’d G2150 Y P a DPROTECTION/SNUBBER Board Schematic Square Wave TIG 255 L9255 Keypad LED Board Square Wave TIG 255 L9212