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LOKERMANN GRAND ARC 402 CEL Operator's Manual

Inverter based welding machines
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THANK YOU FOR USING OUR PRODUCTS
OPERATORS' MANUAL
GRAND ARC 402 CEL
INVERTER Based Welding Machines
IMPORTANT: Read this Owner's Manual Completely before attempting to use this
equipment. Save this manual and keep it handy for quick reference. Pay particular
attention to the safety instructions we have provided for your protection. Contact your
distributor if you do not fully understand this manual.

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Summary of Contents for LOKERMANN GRAND ARC 402 CEL

  • Page 1 THANK YOU FOR USING OUR PRODUCTS OPERATORS’ MANUAL GRAND ARC 402 CEL INVERTER Based Welding Machines IMPORTANT: Read this Owner’s Manual Completely before attempting to use this equipment. Save this manual and keep it handy for quick reference. Pay particular attention to the safety instructions we have provided for your protection.

  • Page 3: Table Of Contents

    THANK YOU FOR USING OUR PRODUCTS CONTENT §1 Safety..................1 §2 Overview..................9 §2.1 Features §2.2 Technical Data 9 §2.3 Brief Introduction §2.4 Duty cycle and Over-heat §2.5 Working Principle 11 §2.6 Volt-Ampere Characteristic 12 §3 Installation & Operation............13 §3.1 Layout for the front and rear panel §3.2 Installation &...
  • Page 4 THANK YOU FOR USING OUR PRODUCTS...

  • Page 5: Safety

    SAFETY §1 Safety Notice: The instructions are for reference only. The manufacturer reserves the right to explain the differences between the description and the product due to product changes and upgrades!
  • Page 6 SAFETY...
  • Page 7 SAFETY...
  • Page 8 SAFETY...
  • Page 9 SAFETY...
  • Page 10 SAFETY...
  • Page 11 SAFETY...

  • Page 12: Overview

    Generator friendly Designed to work with diesel generators and to avoid failures due to its voltage spikes.  Wire Remote Control §2.2 Technical Data Models GRAND ARC 402 CEL Parameters Power Supply Voltage (V) 3~400V±10% Frequency(HZ) 50/60 Rated input current （ A ）...

  • Page 13: Brief Introduction

    OVERVIEW 100% 310A Welding Current 20-400 10-400 Range （ A ） No Load Voltage(V) 95.5 92.5 Efficiency (%) ≥87% Power Factor Protection class IP21S Cooling Net Weight(Kg) 27.2 Dimensions(mm) 670*290*470 Electrode Diameter 1.6~ φ φ Electrode Type 6013,7018, E6010 etc. Note: The above parameters are subject to change with future machine improvement! §2.3 Brief Introduction MMA series of welding machines adopt the latest Pulse Width Modulation (PWM)

  • Page 14: Duty Cycle And Over-Heat

    OVERVIEW shipbuilding, architecture, boiler, pressure container, military industry and Maintenance work , etc. This machine has high duty cycle even in the 40℃, which can keep the continuous operation. The frame is Stability of the machine, which can keep working under high temperature and corrosion environment.

  • Page 15: Volt-Ampere Characteristic

    OVERVIEW §2.6 Volt-Ampere Characteristic MMA series of welding machines has excellent volt-ampere characteristic. Referring to the following graph. In MMA welding, the relation between the rated loading voltage U and welding current I is as follows: ＝ 20 ＋ 0.04 I （...

  • Page 16: Installation & Operation

    INSTALLATION & OPERATION §3 Installation & Operation §3.1 Layout for the front and rear panel （ 1 ） “-” Output terminal. （ 2 ） Wire Remote Control connection socket. （ 3 ） “+” Output terminal. （ 4 ） Input power cable. （...
  • Page 17 INSTALLATION & OPERATION （ 14 ） MMA arc force adjust knob. * （ 15 ） MMA hot start adjust knob. * * Denotes more detailed explanation of function to follow. Further Controls Explained Welding current control knob (6) MMA series has the function of welding current pre-setting. Before welding, adjusting welding current, the welding current display will show the ampere.

  • Page 18: Arc Force

    INSTALLATION & OPERATION Arc Force (14) An MMA welding power source is designed to produce constant output current (CC). This means with different types of electrode and arc length; the welding voltage varies to keep the current constant. This can cause instability in some welding conditions as MMA welding electrodes will have a minimum voltage they can operate with and still have a stable arc.

  • Page 19: Operation For Mma Welding

    INSTALLATION & OPERATION (1) Connect the earth lead to “-”, tighten clockwise; (2) Connect the earth clamp to the work piece. Contact with the work piece must be firm contact with clean, bare metal, with no corrosion, paint or scale at the contact point. (3) Connect the electrode lead to “+”, tighten clockwise;...

  • Page 20: Mma Welding

    INSTALLATION & OPERATION properly. Welding mode selection button (2) Select the MMA /MMAVRD function with the welding mode selection button. (3) Set the welding current relevant to the electrode type and size being used as recommended by the electrode manufacturer. (4) Set welding parameters (hot start and arc force) as required following instructions in the previous section.
  • Page 21 INSTALLATION & OPERATION ●The arc is initiated by momentarily touching the electrode to the base metal. ●The heat of the arc melts the surface of the base metal to form a molten pool at the end of the electrode. ● The melted electrode metal is transferred across the arc into the molten pool and becomes the deposited weld metal.

  • Page 22: Mma Welding Fundamentals

    INSTALLATION & OPERATION The covering on a shielded metal arc welding electrode is called Flux. The flux on the electrode performs many diferent functions. These include: ● producing a protective gas around the weld area ● providing fluxing elements and deoxidizer ●...

  • Page 23: Arc Length

    INSTALLATION & OPERATION is an important factor in arc welding.With the current set too low, difficulty is experienced in striking and maintaining astable arc. The electrode tends to stick to the work, penetration is poor and beads with a distinct rounded profile will be deposited.Too high current is accompanied by overheating of the electrode resulting undercut and burning through of the base metal and producing excessive spatter.

  • Page 24: Mma Welding Trouble Shooting

    INSTALLATION & OPERATION §3.2.5 MMA Welding trouble shooting The following chart addresses some of the common problems of MMA welding. In all cases of equipment malfunction, the manufacturer’s recommendations should be strictly adhered to and followed. Trouble Possible Reason Suggested Remedy No arc Incomplete welding circuit Check earth lead is connected.

  • Page 25: Installation & Operation For Tig Welding

    INSTALLATION & OPERATION Distortion − Excessive heat input Reduce the amperage or use a movement of base smaller electrode metal during Poor welding technique Use the correct welding technique or welding seek assistance for the correct technique Poor joint preparation and or Check the joint design and fit up, joint design make sure the material is not too...

  • Page 26: Operation For Tig Welding

    INSTALLATION & OPERATION (3) Connect the earth clamp to the work piece. Contact with the work piece must be firm contact with clean, bare metal, with no corrosion, paint or scale at the contact point. (4) Connect the TIG torch cable to “-”, tighten clockwise; (5) Connect valve TIG torch gas line to the regulator, ensuring all connections are tight.

  • Page 27: Tig Welding Fundamentals

    INSTALLATION & OPERATION This allows the fan to run and cool the internal components. (9) Switch the ON/OFF Switch (located on the rear panel) to the OFF. §3.3.3 TIG Welding Fundamentals Stricking the arc for TIG Operation: when tungsten electrode touches the workpiece ， the short-circuit current is only 28A .

  • Page 28: Tig Welding Parameters For Steel

    INSTALLATION & OPERATION (Ground Finish) Thoriated 2% DC welding of mild steel, Excellent arc starting, long stainless steel and copper. life, high current carrying capacity. Ceriated 2% AC & DC welding of mild Longer life, more stable arc, Grey steel, stainless steel, copper easier starting, wilder current aluminium magnesium and range, narrower more...
  • Page 29 INSTALLATION & OPERATION Contaminated Touching tungsten into the Keep tungsten from contacting weld tungsten weld pool puddle. Raise the torch so that the tungsten is off of the work piece 2 - Touching the filler wire to the Keep the filler wire from touching tungsten the tungsten during welding, feed the filler wire into the leading edge...
  • Page 30 INSTALLATION & OPERATION Tungsten incorrect or in poor Check that correct type of tungsten condition is being used. Remove 10mm from the weld end of the tungsten and re sharpen the tungsten Poorly prepared tungsten Grind marks should run lengthwise with tungsten, not circular.

  • Page 31: Remote Control Configuration

    INSTALLATION & OPERATION §3.4 Remote control Configuration ● When connect plug the twelve-lead aero-socket of remote control configuration to the remote socket on the power supply, Welder will identify the remote control configuration. ● During operation, the welding current knob on the power supply will not be usable but the other function will work on the power supply.

  • Page 32: Operation Environment

    INSTALLATION & OPERATION §3.5 Operation environment ▲ Height above sea level ≤1000 M ▲ Operation temperature range -10 ～ +40°C ▲ Air relative humidity is below 90 %( 20°C) ▲ Preferable site the machine some angles above the floor level, the maximum angle does not exceed 15℃.

  • Page 33: Maintenance & Troubleshooting

    MAINTENANCE & TROUBLESHOOTING §4 Maintenance & Troubleshooting §4.1 Maintenance In order to guarantee safe and proper operation of welding machines, they must be maintained regularly. Let customers understand the maintenance procedure of welding machines. Enable customers to carry on simple examination and inspections. Do your best to reduce the fault rate and repair times of welding machines to lengthen service life of arc welding machine.
  • Page 34 MAINTENANCE & TROUBLESHOOTING Daily Observe that the knobs and switches in the front and at the back of arc examina welding machine are flexible and put correctly in place. If any knob has not tion been put correctly in place, please correct. If you can't correct or fix the knob, please replace immediately;...

  • Page 35: Troubleshooting

    MAINTENANCE & TROUBLESHOOTING §4.2 Troubleshooting  Before the welding machines are dispatched from the factory, they have already been tested and calibrated accurately. It is forbidden for anyone who is not authorized by our company to do any change to the equipment! ...
  • Page 36 MAINTENANCE & TROUBLESHOOTING on, and fan doesn’t work Overvoltage (Input voltage is Check input voltage too much or not) No no-load voltage output There is trouble inside the Check the main circuit, machine Pr1 and Pr2 No current output in the Welding cable is not connected Connect welding...

  • Page 37: List Of Error Code

    MAINTENANCE & TROUBLESHOOTING short operation The alarm light is on Over heat Over welding Induce welding protection current current output Working time Induce the duty cycle too long (interval work) Over current Unusual Test and repair the main protection current in the circuit and drive PCB main circuit (Pr1)
  • Page 38 MAINTENANCE & TROUBLESHOOTING Welding Phase loss Yellow lamp(thermal machine protection) always on No water Yellow lamp(lack water) always on No gas Red lamp always on Under voltage Yellow lamp(thermal protection) always on Over voltage Yellow lamp(thermal protection) always on Over current Yellow lamp(thermal protection) always on 　...

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