Tweco ULTRAFEED VAF-4, Service Manual

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TABLE OF CONTENTS
4.18 Arc Signal Override (SIL_1 #2) ..................................................................... 4-33
4.19 Welding- 2T Operation .................................................................................. 4-34
4.20 Spot Operation .............................................................................................. 4-34
4.21 Welding- 4T Operation .................................................................................. 4-35
4.22 Stitch Operation ............................................................................................ 4-36
4.23 PTC (Positive Temperature Coefficient) Protection of Power Source Contactor
Control Output .............................................................................................. 4-37
4.24 Ground Fault Operation ................................................................................. 4-37
4.25 Electronic Motor Protection .......................................................................... 4-37
SECTION 5: TROUBLEShOOTING ........................................................................ 5-1
5.01 Error Codes and Remedies ............................................................................. 5-1
5.02 Troubleshooting .............................................................................................. 5-3
5.03
Wirefeeder Faults ............................................................................................ 5-7
5.04 Advanced Troubleshooting .............................................................................. 5-9
5.05 Test Equipment and Tools for Troubleshooting and Servicing......................... 5-9
5.06 Visually Inspect ............................................................................................... 5-9
5.07 Preliminary Check of the Motor Control PCB1 (Main Power OFF)................. 5-10
5.08 Check Main ON / OFF Switch (Main Power OFF) ........................................... 5-11
5.09 Check Main Input Rectifiers (Main Power OFF) ............................................ 5-12
5.10 Preliminary Check of the Power Supplies (Main Power ON) ......................... 5-13
5.11 PCB Connectors ............................................................................................ 5-15
5.12 Main Circuit Description ............................................................................... 5-19
SECTION 6: DISASSEMBLY PROCEDURE ............................................................... 6-1
6.01 Safety Precautions for Disassembly ............................................................... 6-1
6.02 Cover Panel Removal ...................................................................................... 6-2
6.03 Front Panel Removal ....................................................................................... 6-3
6.04 Display PCB2 Removal ................................................................................... 6-4
6.05 Motor Control PCB1 Removal ......................................................................... 6-5
6.06 Main Input Rectifier Removal ......................................................................... 6-6
6.07 Main ON/ OFF Switch and Circuit Breakers Removal ...................................... 6-7
6.08 Gas Valve Removal ......................................................................................... 6-8
6.09 Removing Tweco No. 4 Adaptor ...................................................................... 6-9
6.10 Division Plate and Wirefeed Plate Removal ................................................... 6-10
6.11 Base Panel Removal ..................................................................................... 6-11
SECTION 7: ASSEMBLY PROCEDURE.................................................................... 7-1
7.01 Installing Base Panel ....................................................................................... 7-1
7.02 Installing Tweco No. 4 Adaptor ....................................................................... 7-2
7.03 Installing Division Plate and Wirefeed Plate .................................................... 7-4
7.04 Installing Gas Valve ......................................................................................... 7-5
7.05 Installing Main ON/ OFF Switch and Circuit Breakers ...................................... 7-6
7.06 Installing Main Input Rectifiers ....................................................................... 7-7
7.07 Installing Motor Control PCB1 ........................................................................ 7-8
7.08 Installing Front Panel ...................................................................................... 7-9
7.09 Installing Cover Panel ................................................................................... 7-10