Advertisement
2. DESCRIPTION & SPECIFICATIONS
2.1.
INTRODUCTION
These Inverters are lightweight, powerful and versatile. They are suitable for ARC or TIG welding using “Scratch-Start” method. Models have Arc-Force circuitry
making the units suitable for welding a wide variety of rods including rutile, basic and stainless of various sizes (see specifications). Machines also include thermal
cut out and mains voltage LED’s. Fitted with Hot-Start systems to counter electrode sticking during scratch starting. Supplied in carry case with ARC welding
accessory kit and shoulder strap. Also suitable for tig welding with optional TIG accessory kit ( INV/TIG )
2.2.
DESCRIPTION
These models are “constant current rectifiers” for ARC welding and are controlled by a transistor bridge with a normal frequency of 32khz. The specific
characteristics of the “INVERTER” system provides high speed and precise regulation, ensuring a high quality result with 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 is comprised of power modules which have been developed on a specially
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 alternate voltage (32khz) and permits power regulation according to the
current /Voltage of 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 alternate Voltage/current supplied
by the secondary windings into continuous current/Voltage at a low wave-length.
5.
Electronic and regulation board: Instantly checks the value of the welding current against
that
selected by the user. It modulates the commands of theIGBT drivers, which control
regulation. The control board also determines the dynamic response of the current
transient during the phases of electrode fusion (instant short circuit), and is responsible for
the safety system.
2.4.
SPECIFICATIONS
Model No: . . . . . . . . . . . . . . . . .MW100 . . . . . . . . . . . . . .MW130 . . . .
Power Output: . . . . . . . . . . . . . . . 5-85 A . . . . . . . . . . . . . .5-125 A . . . .
Duty Cycle: . . . . . . . . . . . . . . .25% @ 85 A . . . . . . . . .15% @ 125 A .
Electrode Capacity: . . . . . . . . .Ø1.6-2.5 mm . . . . . . . . . .Ø1.6-3.2 mm . .
Max Absorbed Power: . . . . . . . . .2.8 Kva . . . . . . . . . . . . . .3.5 Kva . . . .
Mains Voltage: . . . . . . . . . . . . . .230V-1ph . . . . . . . . . . . .230V-1ph . . .
Insulation Class: . . . . . . . . . . . . . . .H . . . . . . . . . . . . . . . . . .H . . . . . .
Protection: . . . . . . . . . . . . . . . . . . .IP21 . . . . . . . . . . . . . . . .IP21 . . . . .
Weight: . . . . . . . . . . . . . . . . . . . .3.2 kg . . . . . . . . . . . . . . .3.3 kg . . . .
ARC Accessory Ref: . . . . . .INV/10 (Included) . . . . . .INV/10 (Included)
TIG Accessory Ref: . . . . .INV/TIG (Not Included) . .INV/TIG (Not Included)
3.
ASSEMBLY
Unpack the product and check contents. Should there be any damaged or missing parts contact your supplier
immediately.
p
WARNING! Ensure the inverter is not plugged into the mains power supply before assembling,
connecting or disconnect cables. Electrical installation, see: safety instructions (Chapter 1).
p
p
WARNING! failure to follow the electrical safety instructions will effect machine’s operating performance
and could damage inverter’s built in safety system. This may result in personal injury of fatality, and will
p
invalidate the warranty.
3.1.
WELDING CABLE “ELECTRODE HOLDER” CONNECTION
Before connecting cables it is important to refer to the cable manufacturer’s instructions indicated on the “Stick
Electrode” packaging which will indicate the correct polarity connection for the electrode, together with the most
suitable current to use.
3.1.1. ARC WELDING.
In principle, when ARC welding the ELECTRODE HOLDER ”POSITIVE” is normally connected to the “POSITIVE”
(+) terminal, (fig 2).
3.1.2. TIG WELDING
In principle, when TIG welding alloys, the ELECTRODE HOLDER ”POSITIVE” is normally
connected to the inverter’s “NEGATIVE” (-) pole. (fig 2).
3.2.
WELDING “RETURN CABLE” - (WORK CLAMP) CONNECTION.
The “return cable, Work Clamp” is normally connected to the Inverter’s “NEGATIVE” pole (-).
The other end is connected to:
a) The workpiece.
b) A metallic work bench. The connection must be a close to the proposed weld as possible.
p
WARNING! Connecting cables must be turned fully into the quick plugs to ensure a good electrical contact, loose connection will cause overheating,
rapid deterioration and loss in efficiency. DO NOT use welding cables over 10m in length.
p
With exception of a metallic workbench” DO NOT use any metallic structure which is not part of the work piece in order to substitute the return cable of
the welding current. as this may jeopardise results and may be dangerous.
4.
STRAP ASSEMBLY
4.1.
CARRY STRAP
If not already fitted, follow the carrying strap
assembly as pictured in figure 3.
fig 1
fig 2
fig 3
MW100, MW130 -1 - 300502
Advertisement
