Lincoln Electric V250-S +, +

F-40

TROUBLESHOOTING & REPAIR

F-40

TEST PROCEDURE

1. Remove main input power to the

V250-S.

2. Perform

Filter Capacitor Discharge

Procedure

detailed in Maintenance

Section.

3. Put the mode switch S2 in the

SMAW (soft) position and put the

Local/Remote switch S3 in the

LOCAL position.

4. Put the Output Control R3 at the

minimum position.

5. Locate and familiarize yourself with

the capacitor test locations on the

power board. See Figure F.12.

6. The following tests will be performed

with the input power applied to the

V250-S.

BE CAREFUL. ALWAYS

REMOVE THE INPUT POWER AND

PERFORM FILTER CAPACITOR

DISCHARGE PROCEDURE

BEFORE TOUCHING ANY

MACHINE COMPONENT.

7. Apply the correct input power†and

turn ON the V250-S.

† Note: This test should only be conducted

with the V250-S reconnect switch and “A”

jumper configured for 380VAC and above.

CAPACITOR BALANCE TEST (continued)

INVERTEC V250-S

Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC

Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC

V250S POWER G2684

DANGER

HIGH VOLTAGE CAN KILL

204

201

209

208

205

207A 202A

203A 206

++

CAPACITOR (C2) TERMINALS

CAPACITOR (C1) TERMINALS

Figure F.12 Power Board and Capacitor Test Locations

Contents

Main INVERTEC V250-S SERVICE MANUAL SVM124-A FOR ENGINE powered equipment. i WARNING ELECTRIC AND MAGNETIC FIELDS may be dangerous ii ARC RAYS can burn. ELECTRIC SHOCK can kill. FUMES AND GASES can be dangerous. FOR ELECTRICALLY powered equipment. CYLINDER may explode if damaged. iii WELDING SPARKS can cause fire or explosion. iv PRCAUTIONS DE SRET PRCAUTIONS DE SRET POUR LES MACHINES SOUDER TRANSFORMATEUR ET REDRESSEUR vi MASTER TABLE OF CONTENTS FOR ALLSECTIONS SECTION-A-1 TABLE OF CONTENTS -INSTALLATION SECTION- A-2 Technical Specifications - Invertec V250-S A-2 OUTPUT PHYSICAL DIMENSIONS INPUT SAFETY PRECAUTIONS ELECTRIC SHOCK SELECT SUITABLE LOCATION STACKING TILTING INPUT VOLTAGE RECONNECT PROCEDURE RECONNECT PROCEDURE 'A' A-5 + OUTPUT CONNECTIONS REMOTE CONTROL RECEPTACLE OUTPUT CABLES QUICK DISCONNECT PLUGS Page SECTION-B-1SECTION-B-1 TABLE OF CONTENTS -OPERATION SECTION- B-2 GENERAL DESCRIPTION OPERATIONALFEATURES WELDING CAPABILITY LIMITATIONS SAFETY INSTRUCTIONS - B-3 + I O CONSTANT CURRENT PROCESSES MANUAL ARC WELDING (STICK) AIR CARBON ARC CUTTING TIG WELDING B-5 PARALLEL OPERATION OVERLOAD PROTECTION THERMAL PROTECTION Page SECTION C-1 ACCESSORIES SECTION C-1 TABLE OF CONTENTS -ACCESSORIES SECTION- C-2 ACCESSORIES C-2 OPTIONS / ACCESSORIES CABLE PLUGS REMOTE CONTROLS Page D-2 INPUT FILTER CAPACITOR DISCHARGE PROCEDURE ELECTRIC SHOCK D-3 ROUTINE MAINTENANCE FILTER CAPACITOR CONDITIONING D-4 TABLE OF CONTENTS -THEORY OF OPERATION SECTION- E-2 CONTROL BOARD SHUNT INPUT LINE VOLTAGE FIGURE E.1 - INPUT VOLTAGE CIRCUITS LINE SWITCH RECTIFIER AUXILIARY PRECHARGE AND PROTECTION IGBT Operation Discussion and diagrams MAIN TRANSFORMER E-5 CONTROL BOARD SHUNT OUTPUT RECTIFICATION AND CONTROL IGBT Operation Discussion in this section. FIGURE E.4 OUTPUT RECTIFICATION AND CONTROL LINE SWITCH PROTECTION CIRCUITS OVERLOAD PROTECTION THERMAL PROTECTION INSULATED GATE BIPOLAR TRANSISTOR (IGBT) OPERATION PULSE WIDTH MODULATION MINIMUM OUTPUT MAXIMUM OUTPUT TABLE OF CONTENTS -TROUBLESHOOTING & REPAIR SECTION- Step 1. LOCATE PROBLEM (SYMPTOM). Step 2. PERFORM EXTERNAL TESTS. Step 3. RECOMMENDED COURSE OF ACTION HOW TO USE TROUBLESHOOTING GUIDE OSCILLOSCOPE WARNING _______________________________ PC BOARD TROUBLESHOOTING PROCEDURES F-4 Input Voltage Reconnect F-5 Voltage Checks Input Filter Capacitor Conditioning Protection Circuit Control Board Voltage Checks F-6 Capacitor Balance Test Input Voltage Reconnect Procedure F-7 Resistance Test Input Rectifier Test Installation Section Protection Circuit Page F-9 WELDING PROBLEMS Installation Section Control Board Voltage Page AUXILIARY TRANSFORMER TEST Table F.1 AUXILIARY TRANSFORMER TEST (continued) 1J7 2J7 3J7 4J7 5J7 6J7 Figure F.1 Auxiliary Transformer and Plug J7. AUXILIARY TRANSFOMER PLUG J7 AUXILIARY TRANSFORMER TEST (continued) TABLE F.1 Auxiliary Transformer Test Points Page Page Page Power Board Resistance Input Rectifier Bridge Removal And Replacement INPUT RECTIFIER TEST (continued) TABLE F.2 Input Rectifier Test Points Page Page POWER BOARD RESISTANCE TEST (continued) + Figure F.3 Power Board Test Points. + Removal and Replacement Power Board Voltage Test POWER BOARD RESISTANCE TEST (continued) TABLE F.3 Power Board Resistance Test Points. Page Page OUTPUT DIODES TEST (continued) - Figure F.4 Machine Output Terminals. INVERTEC V250-S + I - Figure F.5 Meter Probes. INVERTEC V250-S O I DIODE MODULES POWER BOARD VOLTAGE TEST Table F.4 POWER BOARD VOLTAGE TEST (continued) + + PLUG J6 Figure F.8 Plug J6 on Power Board #308 (1J6) #307 (2J6) POWER BOARD VOLTAGE TEST (continued) TABLE F.4. Power Board Voltage Test Points. TEST POINTS ACCEPTABLE VOLTAGES TEST CONDITIONS Page CONTROL BOARD VOLTAGE TEST Filter Capacitor Discharge Procedure Table F.5 CONTROL BOARD VOLTAGE TEST (continued) G2666-[ ] Figure F.9 Plugs J1-J5 on Control Board V250S CONTROL CONTROL BOARD VOLTAGE TEST (continued) TABLE F.5. Control Board Voltage Test Points. TEST POINTS ACCEPTABLE VOLTAGES TEST CONDITIONS Page PROTECTION CIRCUIT TEST PROTECTION CIRCUIT TEST (continued) 1J2 Figure F.11 PLUG J6 8J2 6J2 PROTECTION CIRCUIT TEST (continued) PROTECTION CIRCUIT (SIMPLIFIED) Page CAPACITOR BALANCE TEST CAPACITOR BALANCE TEST (continued) + Figure F.12 Power Board and Capacitor Test Locations + CAPACITOR (C2) TERMINALS CAPACITOR (C1) TERMINALS maintenance CAPACITOR BALANCE TEST (continued) TABLE F.6 Capacitor Voltages Page CONTROL BOARD REMOVALAND REPLACEMENT CONTROL BOARD REMOVALAND REPLACEMENT (continued) DEPRESS LOCKING TAB ON MOUNTING PIN Figure F.13 SIX MOUNTING TABS POWER BOARD REMOVALAND REPLACEMENT POWER BOARD REMOVALAND REPLACEMENT (continued) 204 Figure F.14 + 4 SOCKET HEAD CAP SCREWS Filter Capacitor Removal and Replacement POWER BOARD REMOVALAND REPLACEMENT (continued) Page FILTER CAPACITOR REMOVAL AND REPLACEMENT FILTER CAPACITOR REMOVAL AND REPLACEMENT (continued) Replacement Procedure FILTER CAPACITOR REMOVALAND REPLACEMENT (continued) Page INPUT RECTIFIER BRIDGE REMOVALAND REPLACEMENT Page INPUT RECTIFIER BRIDGE REMOVALAND REPLACEMENT (continued) Page Page Figure F.15 SLEEVED SPLICES SNUBBER RESISTORS 7/16 BOLT Figure F.17 Output Diode Assembly and Leads Figure F.15 Figure F.17 LOCKING TABS Figure F.18 Heatsink Removal Page Page DIODE MODULES 7/16 BOLTED CONNECTIONS Figure F.19 Output Diode Assembly and Leads 7/16 MOUNTING BOLTS Page Page Page 201 204 205 Figure F.20 Main Transformer Right Side 208 T3 CURRENT TRANSFORMER MAIN TRANSFORMER Figure F.22 MAIN TRANSFORMER SECONDARY LEADS Figure F.21 Main Transformer Left Side MOUNTING SCREWS LOCKING MOUNTING TABS Figure F.22 Main Transformer Mountings (MACHINE CODES BELOW 10150) Page Page Figure F.24. 201 204 205 Figure F.23 Main Transformer Right Side 208 T3 CURRENT TRANSFORMER MAIN TRANSFORMER Figure F.25 MAIN TRANSFORMER SECONDARY LEADS Figure F.24 Main Transformer Left Side MOUNTING SCREWS LOCKING MOUNTING TABS Figure F.25 Main Transformer Mountings Page Page RETEST AFTER REPAIR Page Page Page G-2 Wiring Diagram (Codes 10102, 10103) - CLEVELAND, OHIO U.S.A. + ARC - ARC 8-5-94 L9280 A B CD + F + ARC - ARC 9-29-95E L9907 A B CD + F G-4 Control PC Board (G2666) Layout G2666 G2666 R46 G-4 G-5 Power PC Board (G2684) Layout G2684 POWER P.C. BD. AS'BLY A1 G-5 G-6 Control PC Board (G2666) Schematic 2 4 OPEN G-6 G-7 Power PC Board (G2684) Schematic LC R74 R50 G-7