2.1.
INTRODUCTION
This Inverter is lightweight, powerful and versatile. It is suitable for ARC or TIG welding using Scratch-Start method. It has Arc-Force circuitry making it suitable for
welding with a wide variety of rods including rutile, basic and stainless of various sizes (see charts). The machine also has a thermal cut-out and mains voltage
LEDs and is fitted with a Hot-Start system to counter electrode sticking during scratch-starting.
2.2.
DESCRIPTION
This model is a constant current rectifier for ARC welding and is controlled by a transistor bridge with a high frequency. The specific characteristics of the
INVERTER system provide high speed and precise regulation, ensuring a high quality result for both stick electrode and TIG welding (DC). The INVERTER
system, regulated at the input of the primary mains, also allows for a drastic reduction in the volumes of both the transformer and the reactance. This reduction in
volume and weight enhances the mobility of the machine. The unit has a power module which has been developed on a special printed circuit designed to maximise
reliability and reduce maintenance.
2.3.
CIRCUIT SYSTEM DESCRIPTION Refer to fig. 1
1. Mains input (single phase), rectifier unit and condenser.
2. Transistors and drivers switching bridge (IGBT). Turns the mains rectified voltage into high frequency alternating voltage and permits power regulation
according to the current/voltage of the weld.
3. High frequency transformer: The primary windings are fed by the voltage converted by Block 2. It has the function of adapting voltage and current to the values
required by the ARC welding procedure and, simultaneously, isolates the welding circuit form the mains.
4. Secondary rectifier bridge with inductance. Changes the alternating current supplied by the secondary windings into direct current.
5. Electronic and regulation board: Instantly checks the value of the welding current against that selected by the user. It modulates the commands of the
IGBT drivers, which control regulation. The control board also determines the dynamic response of the current transient while the electrode melts
(instantaneous short circuit), and is responsible for the safety system.
2. DESCRIPTION & SPECIFICATION
2.4.
SPECIFICATION
Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . MW140.V3
Output: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-130A
Duty Cycle: . . . . . . . . . . . . . . . . . . . . . . 25% @ 130A
Electrode Capacity:. . . . . . . . . . . . . . . . . Ø1.6-3.2mm
Supply Filter: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No
Absorbed Power: . . . . . . . . . . . . . . . . . . . . . . . 4.0kW
Mains Voltage:. . . . . . . . . . . . . . . . . . . . . . . 230V-1ph
Insulation Class: . . . . . . . . . . . . . . . . . . . . . . . . . . . H
Protection: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IP23
Weight: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3kg
Accessories Included: . . . . . . . . . . . . . . . . . . . . . . No
ARC Accessory Ref: . . . . . . . . . . . . . . . . . . . . INV/10
TIG Accessory Ref: . . . . . . . . . . . . . . . . . . . . INV/TIG
fig. 1
7
DO NOT attempt to fit any unapproved torches, components, or parts to
the inverter unit.
7
DO NOT hit the electrode on the workpiece, this may damage the
electrode and make strike-up difficult.
p
p
WARNING! When TIG welding keep the gas bottle away from sources
of heat including sunlight.
7
DO NOT get inverter wet or use in damp or wet locations or areas where
there is condensation.
s
s
DANGER! DO NOT weld near flammable materials - solids, liquids, or gases.
7
DO NOT weld containers or pipes which have held flammable materials -
gases, liquids or solids. Avoid operating on materials cleaned with chlorinated
solvents or near such solvents.
7
DO NOT perform welding on pressurised containers.
7
DO NOT operate the inverter if it or the cables are damaged.
7
DO NOT pull the inverter by the cables, or the torch.
7
DO NOT bend, strain or stand on cables.
7
DO NOT place cables where they will endanger others. Long lengths of
slack must be gathered and neatly coiled.
7
DO NOT use welding cables over 10m in length.
7
DO NOT touch workpiece near to the weld as it will be very hot. Allow to cool.
7
DO NOT touch the torch immediately after use. Allow the torch to cool.
7
DO NOT operate the inverter while under the influence of drugs, alcohol or
intoxicating medication, or if tired.
3
When not in use, store the inverter in a safe, dry, childproof area.
3.
CABLE ASSEMBLY
fig. 4
fig. 2
3.1
Unpack the product and check contents. Should there be any damaged or missing parts contact your supplier immediately.
3.2
WELDING ACCESSORY KITS.
3.2.1 ARC WELDING: To perform conventional ARC welding you will require Sealey Kit INV/10
which contains a welding mask, electrode holder, earth clamp, cables and chipping hammer.
This kit is not supplied with the inverter.
3.2.2 TIG WELDING: To perform TIG welding you will require Sealey Kit INV/TIG which contains a
welding mask, TIG torch and cable with integral gas connection hose, gas regulator, earth
clamp, earth cable and dinse connector and chipping hammer. This kit is not supplied with
the inverter.
p
p
WARNING! Ensure that the inverter is not plugged into the power supply before
assembling, connecting or disconnect cables. See Safety Instructions (Section 1).
3.3
WELDING CABLE ASSEMBLY.
With either accessory kit it may be necessary to assemble the clamps and connectors to the
cables as indicated in the adjacent diagrams.
3.3.1 EARTH CLAMP: Refer to fig.2.
3.3.2 ELECTRODE HOLDER: Refer to fig.3. (For ARC welding )
3.3.3 DINSE PLUG ASSEMBLY: Refer to fig.4.
p
p
WARNING!
Dinse plug connectors must be inserted into the dinse sockets and fully
turned to ensure a good electrical contact. Loose connections will cause overheating,
rapid deterioration and loss in efficiency.
fig. 3
MW140.V3 - 1 - 220205