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WORKING PRINCIPLE
1. Single-phase 230V work frequency AC is rectified into DC (about 325V),
2. It is converted to medium frequency AC (about 20KHz) by the inverter device (IGBT module).
3. After reducing the voltage with the medium transformer (the main transformer) and rectifying by medium frequency
rectifier (fast recovery diodes), then the current is output as either DC or AC by selecting the IGBT module.
4. The circuit adopts current feedback control technology to insure current output stably.
VOLT-AMPERE CHARACTERISTIC
The SMART TIG AC/DC 200P welding unit has an excellent volt-
ampere characteristic, whose graph is shown in Fig. 9. The
relation between the conventional rated loading voltage U
conventional welding current I
When I
<6OOA, U
= 10 + 0.04 I
2
2
When l
>600A, U
= 34 V).
2
2
INSTALLATION
POWER REQUIREMENTS
This welding unit is designed to operate on a properly grounded 230 volt, 60 Hz, single-phase alternating current (AC)
power source that has a 50 amp time delayed fuse or circuit breaker. The use of the proper circuit size can eliminate
nuisance circuit breaker tripping when welding.
NOTICE! Do not operate this welding unit if the actual power source voltage is less than 198 volts AC or greater than
240 volts AC. Improper performance and/or damage to the welding unit will result if operated on inadequate or
excessive power.
A qualified electrician should verify the actual voltage of the power outlet, confirm the outlet is grounded and that the
fuse is properly installed.
The use of an extension cord is strongly discouraged, because of the voltage drop it will cause. This voltage drop can
affect the welding unit's performance. If an extension cord is necessary, #12 wire gauge is the thinnest allowed. The
maximum length of the extension cord should not exceed 25 ft in length.
SHIELDING GAS
Shielding gas protects the exposed weld. The gas covers the molten metal, preventing impurities in the air from
contacting and weakening the weld. S gases and gas mixtures are available for TIG welding.
1
Aluminum Welding - Use only pure Argon gas when welding aluminum.
2. Stainless Steel Welding – Use 100% Argon gas, 100% Helium gas or a mixture of both for stainless steel.
3. Nickel Alloys – Use 100% Helium gas or a mixture of Argon and Helium.
12
SMART TIG AC/DC-200P Inverter Welding Machine
is as follows:
2
(V);
2
and the
2
For technical questions call 1-800-665-8685
V4.1
Fig. 8
Fig. 9
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