Table F.3 | Lincoln Electric SVM101-B specs

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F-28			TROUBLESHOOTING & REPAIR				F-28
			SWITCH BOARD TEST (CONT.)
				TABLE F.3
			SWITCH BOARD RESISTANCE CHECKS

	Apply Positive Apply Negative
	Test Prove to	Test Probe to
	Terminal	Terminal	Test Result	Conclusion	Repair Action	Next Procedure	Notes
12		401/403	Greater than	OK	None	Continue
			1K ohm
			Less than	Shorted	Replace both	Snubber Test
			100 ohms		Switch Boards

401/403		12	Less than	OK	None	Continue
			100 ohms
			Greater than	Open	Replace both	Snubber Test
			1K ohm		Switch Boards

9		402/404	Less than	OK	None	Continue
			100 ohms
			Greater than	Open	Replace both	Snubber Test
			1K ohm		Switch Boards

402/404		9	Greater than	OK	None	Continue
			1K ohm
			Less than	Shorted	Replace both	Snubber Test
			100 ohms		Switch Boards

V300-I

Image 58

Lincoln Electric SVM101-B service manual Table F.3

Contents

Invertec Safety ARC Rays can burn Electric Shock can killFumes and Gases can be dangerous Cylinder may explode if damaged SafetyWelding Sparks can cause fire or explosion Iii Précautions DE Sûreté Sûreté Pour Soudage a L’Arc Master Table of Contents for ALL Sections Installation Section Table of ContentsSection A-1 Installation Three Phase Single Phase Input Voltage Setup 3INSTALLATIONA-3Product Description Electrical Installation Location Single Phase Input Power Input ConnectionConnection of Wire Feeders to the Invertec Three Phase Input K900-1 DC TIG Starter Connection Remote Control of InvertecParallel Operation Output Cables 6INSTALLATIONA-6Quick Disconnect Plugs Operation Section Section B-1 Duty Cycle OperationOperating Instructions Control Function / Operation Mode Switch Full Range Is Is Very Soft, 10 Is Very Crisp Meter Polarity Switch Auxiliary Power Accessories Section Section C-1 Accessories Options / Accessories Maintenance Section Section D-1 Maintenance Input Filter Capacitor Discharge Procedure Preventive Maintenance Overload Protection Figure D.2 Location of Maintenance Components Theory of Operation Section Section E-1 Theory of Operation Input Line Voltage & Auxiliary Transformer Precharge & Protection Circuits Return to Return to Section TOC Switch Boards Figure E-4 ---SWITCH Circuits & Transformer Output and Control Circuits Figure E-5 --OUTPUT & Control Circuits Passive Minimum Output Pulse Width ModulationMaximum Output Overload Protection Protective CircuitsThermal Protection Troubleshooting & Repair Section Section F-1 Troubleshooting & Repair HOW to USE Troubleshooting Guide PC Board Troubleshooting Procedures Input Filter Capacitor CONDITION- ING Additional Information Oscilloscope WarningMatched Parts Feeding Problems Department Feeding Problems See Input Rectifier test See Output Diodes test See Switch Board test V300-I 11TROUBLESHOOTING & REPAIRF-11 Input Filter Capacitor Discharge Procedure Input Filter Capacitor Discharge Procedure Figure F.I Location of Input Filter Capacitor Terminals Output Pilot Circuit Test Test Procedure G2527 J2 J4 J3 V300-I Protection Board Output Test Test Procedure Turn Power Switch OFF 313 306 J15 275F 311 V300-I Protection Figure F.6 Inserting Probes Capacitor Balance Test Static Capacitor Test 912 V300-I Switch Board Test Switch Board Test Switch Board Test Table F.3 Snubber Resistor Test Snubber Resistor Test Check Test Result Conclusion Next Test Step Repair Action Output Diode Test Test Procedure Output Diode Test Input Rectifier Test Points Steps Table F.5Probe Acceptable Meter Reading Overcurrent Protection Current Trigger Test Overcurrent Protection Current Trigger Test 302 G2527 Control J1 275D Control Overvoltage Protection DC Trigger Circuit Test Overvoltage Protection DC Trigger Circuit Test Figure F.16 PC Boards Removed 306 275F 309 310 3J8 2J14 1J6 1J8 #311 1J14 6J6 #302#313 #275D #301 #305 Thermal Protection AC Trigger Circuit Figure F.20 PC Boards Moved for Access Thermal Protection AC Trigger Circuit Figure F.21 Thermal Protection AC Trigger Circuit V300-I Power Board Test Test a Power Board TestTest B Figure F.23 Power Board Test Points Simplified Trigger Circuit Capacitor Removal and Replacement Procedure Capacitor Removal and Replacement Procedure Figure F.27 -- Removing Capacitor Nuts Figure F.27 Switch Board Removal and Replacement Procedure Switch Board Replacement Procedure Test After Switch Board or Capacitor Replacement Test After Switch Board or Capacitor Replacement Perform Retest After Repair Output Diode Replacement Procedure 60TROUBLESHOOTING & REPAIRF-60 Output Diode Replacement Procedure 61TROUBLESHOOTING & REPAIRF-61 Procedure Diode Modules Output Retest After RepairOCV at rated Input V300-PRO Min. Acceptable Max. All Modes V300-I V300-PRO Electrical Diagrams Section Section G-1 Wiring Diagram Entire Machine Code 9826 L8657 #0# Wiring Diagram Entire Machine Code 9827 L8938 Return Wiring Diagram Entire Machine Code 10036 L9299 Wiring Diagram Entire Machine Code 10037 L9300 $ $ Wiring Diagram Entire Machine Code 10132 L9567 Section Wiring Diagram Code Wiring Diagram Entire Machine Code 10133 L9568 Wiring Diagram Entire Machine Code 10258 L10189 $& $ V300-I Wiring Diagram European Wiring Diagram Entire Machine Code 10336, 10450 L10205 Schematic Entire Machine # . $ #$ !#$ #! %&$ Schematic Driver PC Board S20216 PC Board Assembly Driver L8660 Identification Schematic Driver PC Board S20799 PC Board Assembly Driver Description Schematic Switch PC Board L8440 PC Board Assembly Switch L8441 CAPACITOR, Cemo 2700P 50V 5% Schematic Switch PC Board L10956 PC Board Assembly Switch L10958-1 Reqd Identification Schematic Control PC Board G2525 Electrical Diagrams CAPACITOR, Cemo 150P Schematic Protection PC Board M16097 PC Board Assembly Protection L7915-2 DZ1 Schematic Power PC Board M16018 PC Board Assembly Power L8033-7 VOLT. REG. & Heat Sink Asbly