SERVICE MANUAL
Contents
1. Tradesarc Dual 141i SERVICE MANUAL 5 PAGE INTRODUCTION 1 SPECIFICATION 1 INSTALLATION 1 2 PARTS LIST CIRCUIT DIAGRAM FAULT FINDING GUIDE MAIN INVERTER PCB LAYOUT AUTOSWITCH PCB OPERATION AUTOSWITCH PCB LAYOUT MUREX INTRODUCTION The Murex Tradesarc Dual 1411 15 a small portable inverter based power source for MMA or TIG welding using the scratch start method The unit provides up to 140A welding current and operates from either 230V or 110V single phase AC electricity supplies The unit contains automatic supply voltage sensing circuitry so that no tap changes are required The Dual 141115 housed in an all metal enclosure a small fan at the rear providing cooling for the internal semiconductor components A thermal sensor built into the unit prevents excessive temperatures should the unit be overdutied and output is disabled and a front panel warning light illuminated under such circumstances In combination with an optional TG123V TIG torch and Argon gas supply the Dual 141i can be used for TIG welding of stainless components and the like Specification Input Mains Supply 23OV 110V 1 phase 50 60Hz Power max 4 3 KW KVA max 5 3 Fusing 16A slow on 230V 32A slow on 110V Output on 230V supply Current Range 10 140A dc Rating TIG 14OA 16V at 60 duty 110A 14V at 10096 duty 120A 25V at 60 duty 95A 24V at 10090 duty OCV 70V de2. Connection to the Mains The Dual 141i can be used on 230V or 110V single phase electricity supplies On 230V a standard 13A fuse is adequate for most MMA or TIG welding applications For higher duty work with 3 2mm electrodes at 140A for example A 16A slow fuse must be used On 110V supplies a 32A fuse should be used corresponding with a supply of not less than 3KVA The unit contains sensing circuiting which automatically adjusts itself to match the mains input supply 230V or 110V as necessary No internal adjustments are required A a oon ER O MM o e Mains extension leads Care must be taken when supplying the unit via long mains extension cables On 230V supplies the recommended cross section of such cables is 2 5mm On 110V supplies extension cables are not recommended Siting the unit Position the unit to give good all round ventilation Do not block the air inlet on the rear pane or the front or side panel louvers Preferrably choose off floor location away from dust dirt or damp Welding Cables The recommended cross sectional area of each welding cable should be not less than 15mm If using welding cables over 5m long 25mm cable should be used to prevent voltage losses MUREXS PARTS LIST Pt No 1 1415480 1415481 1415485 1415482 1415496 1415497 0 N Description Cct Ref Fan EMC Filter
3. MUREX Murex Welding Products Limited D AN Hertford Road Waltham Cross P Herts EN8 7RP England hz 7 Telephone Lea Valley 01992 710000 y Printed in England
4. Dimensions Length 337mm Width 146mm Height 230mm Weight 8Kg net Standards 60974 1 amp 50199 Generator capacity not less than BKVA A 13A slow fuse is adequate for most applications INSTALLATION Radio Interference Murex welding power sources have been designed to high standards of electromagnetic compatibility However arc welding by its very nature generates radio frequency energy and may cause interference By installing and using the equipment correctly in accordance with these instructions the problems of interference may be minimised This equipment satisfies the requirements of the EU Directive 89 336 EC on EMC and complies with the limits in EN 50 199 EMC product standard for arc welding equipment These limits are designed to provide reasonable protection against interference in heavy industrial areas If this equipment is used in domestic areas eg for repair or maintenance particular care should be taken The time of day should be chosen and the duration of welding limited to minimise any potential problems If this equipment caused interference the guidance given below should be considered If a solution cannot be found please contact your distributor or the manufacturer Before installing this welding equipment an assessment should be made of potential EMC problems that may occur It is good practice not to install welding equipment next to computers or safety critical control circui
5. PCB Check for 320Vdc across de side of input rectifier bridge RS1 on main inverter PCB Check 18Vac supply from auxiliary transformer T1 Check thermal switch soldered connections to back of inverter PCB above main output rectifier heatsink Check wiper voltage of current control pot P1 varies smoothly over the range 0 5Vdc w r t the min end of the pot Tradesarc Dual 1413 Inverter PCB 14 Vac 10 Tradestig Dual 1511 oC 110 800000 00509 4 ooo 0 696 50205 oues ono BI o qi 01129 9 EE ECTS Ot ai FO 4 Del fl a s o filo 5 empe A 22 1 DI 901009 4 oerh 07 is 000 omo Es o 139 0 o d 1 Q2 CASE 0 242404 Voc ga 21208 1 UT m 230 1 10 Vic Inverter PCB emerit que py de del E NA Fas py NO RMOHS SV 0 85 174 2 43L11J 7 82d HS Snsopea HPT ENG 248 1 Cod AOCZ OTI 50 0669 6 110 230V Autoswitch PCB Layout Dual 1411 Dual 1511 oft ar ofmjo zi s 69 o amp o
6. Power Switch Yellow LED Potentiometer 100 Knob for item 5 VR1 1 DL1 P1 O o N 0 Pt No 1404314 1415576 1415492 1415575 1415495 Description Dinse Socket Inverter pcb ass y Voltage autoswitch PCB Circuit Breaker 25 Control Transformer Cct Ref PCB2 PCB1 CB T1 gt EJ UR 0 2 513 HHO GI ISSANI caod ILpL sesape Tradesarc Dual 1411 FAULT FINDING GUIDE Symptom Unit dead no green pilot light fan not running Pilot light is on but fan does not run and there is no but pilot light is on and fan runs Thermal overload indicator on but unit is cold reduced or welding current unsteady and current control uneven should be 70Vdc 5 100kohm Checks Using 230V supply Mains supply fuse Remove top cover Inspect for signs of obvious damage Check for 230Vac output from EMI filter Check for 230Vac output from mains switch Check for 230Vac at fan terminals Check for 230Vac between connection A2A of main inverter PCB and A2 of autoswitch PCB If not check 25A Circuit Breaker Check for 230Vac between A1 and A2 of the autoswitch PCB If not suspect resistors RI R2 on main inverter PCB Check for 230Vac at the auxiliary transformer T1 primary if not suspect autoswitch
7. ts eg electronic machine guards unless they have been suitably protected This equipment should be connected to the primary supply using the cable provided However for permanent installation if interference problems occur shielded cable or conduit should be considered The primary cabling and welding cables should be kept separate to other mains wiring and control signalling or communications leg telephone cables If interference occurs then greater separation or re routing should be considered Welding cables should be kept as short as pract cally possible Interference may also be reduced by separating the welding equipment from the other equipment affected partition brick wail or particularly a metal screen will also reduce interference Earthing and equi potential bonding should also be considered but guidance should be sought from a competent person the distributor or manufacturer To ensure continued compliance to the EMC Directive this equipment should be routinely maintained according to the manufacturers instructions and using only approved spare parts In particular the spark gaps of HF units should be adjusted and maintained according to the manufacturers recommendations All access and service door and covers should be closed and properly fastened when the equipment is being used This equipment should not be modified in any way except for those changes and adjustments approved by the manufacturer MUREX
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