Resanta 220 saipa diagram - inverter diagram RESANTA SAIPA-220

Resanta - 220 inverter repair.

Resanta - 220.

Repair of welding inverters

» data-medium-file=»https://i2.wp.com/trigenn.ru/wp-content/uploads/2016/07/RESANTA_220-e1469014105559.jpg?fit=291%2C300&ssl=1″ data-large- file=”https://i2.wp.com/trigenn.ru/wp-content/uploads/2016/07/RESANTA_220-e1469014105559.jpg?fit=993%2C1024&ssl=1″ >We received a welding inverter for service Resanta - 220. The device did not turn on. We open the body of the device and look through it. We check the input transistors using the high control circuit, we also check the diodes, resistances, and capacitors connected to this circuit. In our case, the device, in the power circuit, turned out to be all right. Let's go further, go to the control circuit of the board, and also check all the details. In order, and so on, I get to diode D03, which was open, and capacitor C06 showed a capacitance leak. After replacing the above parts. We connected the device to the connectors, plug it into the network and check that the device is working.

Radio circuits. — Resanta SAI-220

Welding inverter circuits

General characteristics

In the attachment to this page you will find diagrams of welding inverters Resanta SAI-220, SAI-220K, SAI-220PN, SAIPA-220, taken from various sources.

The archives contain diagrams of the modules used in this product: SAI-220 ENDU180_V1, ENDU180J_V1, ENDU180J_V2, ENDU180J_V3, ENDU180J-W SAI-220K ENDU180SD, ENDU180SD-W

Reviews about the Resanta SAI-220 inverter from users

Reviews from those who have already evaluated it in practice, using it to perform welding work, say a lot about the quality and technical characteristics of the inverter of this model.

And finally, a short video that briefly but succinctly reveals the differences between the Resanta SAI-220 welding inverter with the PN attachment, designed for operation in a low-voltage network.

Good afternoon. I recently bought myself a Resanta Sai 220 welding machine and for some unknown reason it does not want to work. Please tell me what the main malfunctions of the Resant Sai 220 are. Thank you very much.

Advantages of using an inverter of this model

As with many models of modern inverter devices, this welding machine has a number of options that ensure high quality welded joints. Thanks to such options, a very important task is also solved - the influence of the welder’s qualifications on the quality of the joint being formed is minimized.

These options, which are familiar to many welders, include:

• automatic shutdown of the device if the elements of the circuit diagram overheat (this option is possible due to the presence of a special temperature sensor);
• “Hot start” is an option that ensures quick ignition of the welding arc due to the automatic supply of increased current to it;
• “Anti-sticking” is a function that automatically turns off the welding current at the moment when the tip of the electrode is welded to the surface of the parts;
• “Arc force” is an option that automatically increases the welding current when the arc length shortens and makes it possible to prevent sticking of the electrode.

The power of the device allows welding seams with electrodes up to 5 mm, but the current consumption is about 30 A

The welding inverter under consideration provides enhanced protection of the elements of the circuit diagram from overheating. This protection is provided by several design features:

• the presence of two fans at once, improving the cooling process of the device;
• high resistance of electronic circuits to overheating;
• the use of a temperature sensor that automatically turns off the equipment when it overheats.

The listed options are equally useful for both beginners and experienced welders, as they allow you to avoid many inverter malfunctions associated with overheating of the electronic filling, and also significantly expand the functionality and scope of use of the device.

The strong handle and fastened belt add convenience both when carrying the unit and during operation.

The indisputable advantages of the inverter of this model also include the following.

• The exceptional mobility of the inverter is ensured not only by its light weight, but also by the presence of a convenient shoulder strap, thanks to which the device can be carried to any place where welding needs to be carried out.
• The housing and other elements of the inverter are highly resistant to mechanical damage, which can be caused by impacts, falling or overturning of the equipment.
• The welding machine of this model is exceptionally compact (130x310x190 mm) and mobile.
• If desired, you can order an inverter package that includes a special suitcase with a handle, in which it is convenient to store and transport not only the device itself, but also all the necessary cables.
• The design of the inverter allows for its efficient operation even at fairly low ambient temperatures (down to –20). However, when welding at low temperatures, you should strictly monitor the heating and cooling conditions of the equipment.

Many specialists and organizations involved in sales of welding equipment, judging by the reviews, complain that among the inverters of the model in question there is a fairly large percentage of defects. Thus, there is data according to which out of 10 Resanta model 202 welding machines, 1–2 are not completed until the end of the warranty period and fail.

Faulty parts causing overload

If you encounter a malfunction such as overheating of the inverter, you can fix it yourself or with the help of service specialists. Very often, overheating is associated with poor contacts between the elements of the electronic circuit and this problem can be eliminated by revising them. The situation is much more complicated when the electronic components of the inverter fail. In some cases, the cost of replacing such components can be comparable to the price of a new device.

The big disadvantage of inverters of this model is that the actual values ​​of the welding current that they generate may diverge from the passport data by 15–20%. In most cases, this does not reduce the efficiency of using welding equipment, but nevertheless impairs its functionality.

Problems listed in the instructions for the welding machine

The Resanta model 202 inverter is not very effective when working with parts whose thickness exceeds 10 mm. In such cases (even using electrodes with a diameter of 5 mm), only surface melting of the metal is possible, and effective heating of the parts being connected does not occur over their entire thickness.

In general, reviews of the inverter of this model and the opinions of experienced specialists indicate that such a device is convenient and reliable in operation, and allows you to obtain high-quality and neat welded joints.

The ease of operation and maintenance of the device makes it easy to learn how to operate it, for which you can even use special videos. Of course, watching a video is best supported by theoretical knowledge that will help you thoroughly study the characteristics and capabilities of the equipment.

Repair of electromechanical voltage stabilizers

What is a control circuit, its difference from the emergency and thermal circuits, and why the repair of any serious automation must begin with checking the control circuit - it is described in detail, I highly recommend it if you have read this far. The second is the absence of a cooling fan, in this case the cooling is natural. Total - 5 contacts. Of course, watching a video is best supported by theoretical knowledge that will help you thoroughly study the characteristics and capabilities of the equipment.

I look forward to constructive criticism and exchange of experience in the comments. The use of a pulse transformer allows you to obtain powerful currents in the secondary winding.

How do you repair such stabilizers? Common problems in the operation of AIS Advantages of using an inverter of this model As with many models of modern inverter devices, this welding machine has a number of options that ensure high quality welded joints.

Scheme 1 - Electrical circuit of the Resant SAI welding inverter

The versatility of the Resanta model inverter, ensured by the features of its design, is also a big plus. And it powers all the main blocks of the welding inverter.

A crack and characteristic burns may be on the side of the resistor that faces the board.

This starter is necessary to protect the shutdown of the stabilizer and load in case of unavailability, malfunction or overheating. Increasingly, gardeners are growing yellow watermelon, which Schemes of RESANTA welding machines

Selecting the type of protection

The modern market for electrical appliances offers two types of voltage stabilizers: stationary (for the whole house) and mobile (serves one or more electrical appliances). Also, depending on operating conditions, stationary units are divided into single-phase and three-phase. Installing a voltage stabilizer has certain differences: connecting to 220 V or 380 V.

In a country house or apartment, as a rule, a single-phase model is installed, which protects the entire network from overloads.

Reviews of the welding inverter Resanta SAI 220

Positive feedback from working with the SAI 220 inverter - convenience and simplicity.

The main users of Resanta Sai 220 do not have much experience in welding. This device is quite suitable for them, because it can be turned on and used literally after leaving the store, having first read the operating instructions. The inverter is easy to transport and has small dimensions - 310x130x190(195) mm, so it fits in a household bag or backpack.

Design features allow you to maintain a stable arc with constant parameters. This makes the weld neater and stronger, since it is formed from a continuously formed strip of melting metal and is a monolith.

When welding with machines that do not have the functions inherent in the Resant inverter - maintaining the arc due to a higher current, a hot start with an abrupt increase in current when touching the metal and anti-sticking (automatic reduction of the current, due to which the electrode easily comes off the surface being welded) - welding can turn into long attempts to light an arc and tear off the stuck electrode. The resulting weld is usually not of the highest quality and is far from monolithic.

The advantages of this inverter also include:

• resistance to mechanical stress (shocks, falls from a height of up to one meter) without loss of performance is typical for an average device of this type;
• ability to work down to -20 degrees, observing the temperature regime of heating and cooling;
• 2 cooling system fans that improve airflow inside the case;
• resistance to overheating when fans fail. Practical tests show that the Resanta Sai 220 switches off only after expending two 5 mm electrodes, if the cooling system does not work;
• reasonable price (from 260 to 290 $), which depends on the store and region. Ordering a device from a direct supplier is usually cheaper, but it is very difficult to find less than $260. It’s also not worth overpaying more than $290, it’s better to look further - there will definitely be options.

Peculiarities

Of course, a master of his craft can make decent seams with a Chinese inverter for a ruble, but a home craftsman or a practicing student is unlikely to have the same skills. Including in public transport.

In some cases, the cost of replacing such components can be comparable to the price of a new device. It is necessary to check sequentially all control units and elements of the wiring diagram.

Then right-click, Save image as... etc. Otherwise, do-it-yourself repairs can only result in a waste of time and effort.

And during normal operation, it will protect the device from overloads using the built-in cooling system. The situation is much more complicated when the electronic components of the inverter fail.

Check the surface of the electrode for moisture; if it is wet, it needs to be replaced. However, I will not describe the principles of operation of the autotransformer here. The output rectifier is also fully equipped: 6 dual diodes, a massive choke at the rectifier output,

This characteristic reflects as a percentage the duration of continuous operation of any equipment in relation to the total time of use. Here it is no different from the other inverters that we wrote about above. It is easy to use, all adjustments are intuitive. Ivan Sokolov had never done welding before, but when he bought a house, he realized that he had to learn. The device is not suitable for professional use, only for domestic use.

If desired, you can order an inverter package that includes a special suitcase with a handle, in which it is convenient to store and transport not only the device itself, but also all the necessary cables. So, with the welding current set to A, some machines only output This is normal, but a radiator is provided to cool it. Two LEDs on the front side blink, and the fan twitches in time.

The lineup

The Resanta range of inverters includes a large number of different devices that differ in power and purpose. Let's look at several of the company's most popular welding inverters.

Resanta SAI 220

The welding inverter Resanta SAI 220 is a powerful unit for a professional workshop. It is popular among companies engaged in casting and processing of metal of various grades and thicknesses. The maximum welding current is 220 A, which allows you to work with an electrode with a diameter of 5 mm.

Need to know: the operating power of the device is 6.6 kW. Therefore, a fixed home network may not be able to withstand such a load.

There is the possibility of smoothly adjusting the current from 10 to 220 A. Continuous welding is allowed, with a one-time load of 70% for 7 minutes. The cost in retail stores can reach 9,000 rubles.

Resanta SAI 190

Resanta SAI 190 is a compact welding inverter for home and production workshop. Designed for manual arc welding with a coated electrode with a diameter of up to 5 mm. The maximum thickness of the workpiece is 8 mm. Operating power is 5.5 kW. This is a fairly powerful unit, so it is very often used in the foundry industry.

Capable of working at reduced voltage, up to 160 V. It is possible to smoothly adjust the welding current from 10 to 190 A. Built-in indicators allow you to control the work process and protect against overload. It has built-in functions: anti-stick electrode, hot start, and tunnel cooling. The cost varies from 5800 to 7000 rubles.

Resanta SAI 250

Welding inverter Resanta SAI 250 is a reliable and heavy-duty unit for manual arc welding of the MMA type, for work you can use a coated electrode with a diameter of 1 to 6 mm. The power of the device is 7.7 kW, which allows for smooth adjustment of the welding current from 10 to 250 A.

Inverter technology guarantees a stable arc and the highest quality seam, as well as maintaining functionality when the network drops to 160 V. Therefore, this welder is suitable for both experienced and home craftsmen. Equipped with an automatic shutdown function in case of overheating or short circuit. The cost of the unit is 9400.

Resanta SAI 160

The welding inverter Resanta SAI 160 belongs to the household line. Designed for manual welding with a 1.5-4 mm electrode. It has a built-in welding current regulator from 10 to 160 A, with a stable arc voltage of 26 V. Ideal for a stationary 220 V network, weight is 4.5 kg.

Equipped with a forced cooling fan, which prevents overheating and also reduces breaks between approaches to a minimum. The absence of a bulky transformer makes it lightweight, virtually silent and compact. The market value of the unit is 5800-6000 rubles.

Complete set of inverter devices

The basic equipment of the units is standard and includes:

• Ground clamp cable;
• Electrode holder;
• Transport strap;
• Instructions and box.

Some models may be supplied in a plastic case with space for a welding helmet.

Checking PN

Since the current characteristics of all inverters are overestimated, the voltage limit indicated on the inverter nameplates is also not true. To imagine what load duration the sources have, let’s calculate their approximate operating mode. To do this, all devices will be loaded with their real maximum current and placed in a heat chamber (at a temperature of 40 degrees). Based on the time that each source can stay in the thermal circuit without turning off, we will draw conclusions about the real PN.

When coming to the store to buy a new welding inverter, a professional welder pays attention to the continuous load current, which is indicated on the nameplate. The numbers indicated there indicate the threshold current values ​​that the welder can set at the source without fear of the machine shutting down due to overheating, regardless of operating time. Incorrect data indicated in the PN100% column can mislead the welder and lead to forced downtime.

Test results obtained in a thermal chamber

Scope and technical characteristics

If this does not happen, then you need to check the fqp4n90c transistor.

The optimal electrode diameter for welding is mm. Since the brush is a contact, and a rather poor one at that, it gets hot.

The Resanta SAI model is designed for welding using coated electrodes. You need to be able to operate a multimeter, an oscilloscope, not to mention voltmeters and other measuring equipment.

You need to check the adjustable pads and all relays according to the diagram. Also in the same circuit, 10 Ohm resistors burn out, this is a consequence of the breakdown of the transistors. This indicates a breakdown of the microcircuit responsible for the operation of the cooling system. Reliable, I accidentally dropped mine several times, nothing, it works. Provides for testing the performance of transistors, power diodes, resistors, pulse transformers, zener diodes and other elements that make up circuit diagrams. And it powers all the main blocks of the welding inverter. They simplify and speed up your work.

general information

Resanta SAI-220 is a portable welding inverter designed for manual arc welding with coated electrodes. To operate it, it is enough to have a socket and a 220V household power supply. When welding, you can use electrodes with a diameter of up to 5 millimeters. The maximum welding current is 220 Amperes, which is enough for students and summer residents. The open circuit voltage is 85V. The arc ignites without any problems, so you can weld all types of metals.

The equipment in SAI-220 is standard. There are two cables with a holder and a terminal, the cables themselves are 2 meters long each. Also in the box you will find a power cable, its length is 170 cm. We believe that this is clearly not enough to perform some work. So use an extension cord.

There is nothing else in the box. If necessary, you can buy a model with a convenient case, and also purchase a welding mask and other personal protective equipment separately.

The device is equipped with additional functions “anti-stick” and “hot start”. Now even the cheapest inverters have these functions, so they won’t surprise you. But one cannot fail to note the presence of such functionality in SAI-220. After all, the “anti-stick” and “hot start” functions will especially appeal to those who are just starting to learn the basics of welding. They simplify and speed up your work.

Welding currents and shape of the current-voltage characteristic

Let's consider the current-voltage characteristics of the devices and draw conclusions about their operating properties.

To summarize, we can say that none of the test participants passed the test. You can calculate for yourself how many amperes of rated current each inverter does not deliver. That is, the price of welding power supplies includes clean Chinese air, which amounts to 25 to 35% of the price of the devices. As for the shape of the current-voltage characteristic, it can be assumed that the ignition process and the stability of the arc must be at an acceptable level.

SAI 160

Belongs to the budget category. A primer for a beginner in welding. However, it will allow you to cook, say, a greenhouse in the garden. If your requests for welded configurations are also unpretentious, this is what you need!

What you can do with a 160 Ampere welding current on hand Apply a patch to a barrel-type container or eliminate a leak in a garden water supply.

Start building a fence on your property. Weld a simple, but with a twist gate. This is enough for a standard “kit” for a country welder.

Getting started is easy. Socket + 220 volts. The operating principle is the same for all AIS models. The power is small, so you don’t expect to spend a lot on electricity. For an electrode, a diameter of 2 to 3 mm is sufficient.

The budget option also has anti-stick and hot start functions. It will greatly simplify the work of novice craftsmen. The SAI160 kit is similar to other inverters.

We are talking about welding cables, holder and ground. A mask will be a separate purchase. In this case there is an advantage. In the retail chain, you can choose the right size for yourself and take into account the specifics of the welding that you have to do.

The kit may only include a modest mask-shield, the eyelid of which may turn out to be unpleasantly short. The manufacturer will not think about the above-mentioned nuances. When buying SAI 160, take care of the cables. You can hardly expect super quality from complete ones. Below is a diagram of the device.

Advantages and disadvantages

The pros and cons of the Resanta SAI 220 device are the same as all other inverters in this price category. But let's start with the good.

The first thing you will like is that it works from a regular 220V household outlet. You don't need any special type of connection, just plug the plug into the socket and you're good to go. The main thing is that your household electrical networks operate without strong power fluctuations.

Another plus is the use of modern IGBT-type transistors in the design of this device. Thanks to them, it was possible to introduce additional functions and reduce the dimensions of the SAI-200. You can hang the inverter on your shoulder using the included strap and conveniently transport it or cook it in hard-to-reach places.

Additional features are another big plus. The device is protected from overheating and is equipped with anti-stick and hot start functions. They simplify your work and make welding more productive.

In general, the device is well built. The case is durable, made of metal. And to use this inverter, it is enough to have basic theoretical knowledge. It’s not for nothing that this model is often used specifically for studying. It is easy to use, all adjustments are intuitive.

Now about the disadvantages. First of all, devices like SAI-220 are not recommended for professional welding work. Of course, a master of his craft can make decent seams with a Chinese inverter for 2,000 rubles, but a home craftsman or a practicing student is unlikely to have the same skills.

So, if you want to develop your welding skills, look towards more powerful and technologically advanced welding machines. They will give you more opportunities and unlock your potential.

Scheme of inverter welding machine Resanta 220

RESANTA SAI-220 inverter circuit

A complete diagram for the Resanta SAI-220 welding machine is provided. The basis is the UC3842BN microcircuit and more powerful bipolar transistors with an insulated gate FQP4N90C. The device is an inverter type, designed for manual electric arc welding with direct current wire in a protective gas environment - carbon dioxide, argon or a mixture thereof. The inverter welding machine is designed for manual electric arc welding with a direct current coated electrode. The operating principle is based on converting AC mains voltage with a frequency of 50 Hz into DC, and then converting DC voltage into high-frequency AC. Resanta SAI-220PN is made in a metal case with an opening wall. Pulse width modulation is used to regulate the welding current. This inverter device has overheating protection and is equipped with a forced ventilation system.

Characteristics of the inverter RESANTA SAI-220

Operating voltage range, V 220 (+10%;-30%) Maximum current consumption, A 30 Open circuit voltage, V 80 Arc voltage, V 28 Welding current control range, A 10-220 Load duration, % 70% 220A

Scheme

Beginners may think that we only need one diagram of the Resanta 220 inverter welding machine from the SAI line. But it is not so. Below we have placed four diagrams at once that will help you perform simple repairs or construct a similar inverter with your own hands.

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№1

№2

№3

№4

We do not recommend performing soldering work unless you have sufficient experience and at least basic knowledge of electrical engineering.

Each electrical diagram is available in high resolution, just open the images in new tabs.

How to connect a powerful single-phase stabilizer for 220 V

Before presenting the diagram, it is necessary to remember that 220 V electrical networks are equipped with two wires. The first is phase, the second is zero. To correctly identify them, you will need a special indicator screwdriver. The verification procedure is as follows. Take a screwdriver, place your thumb against the metal protrusion on the handle, and connect the working surface to the exposed electrical wire through which the current passes. If the light on the screwdriver lights up, then it is a phase; if not, it is zero.

Now let's look at the scheme itself. When connecting a single-phase stabilizer, you need to pay attention that it has several attachment points where cables are connected. Many people simply do not understand what should be connected where.

There are two types of units from this group. The first ones have zero and one phase each (for input and output). The latter have phase-input and phase-output along with zero-input and zero-output. They look like clips with a corresponding signature.

In the first situation, the phase conductor coming from the meter is taken and connected to the phase-input connector, and the zero conductor to zero. In this case, there are two output electrical cables going to consumers: the first is connected to the output phase, the second to zero.

In the second situation, the cable phase and neutral are fixed above the corresponding “phase” and “zero” terminals. The output ones, in turn, are attached to the phase-output and zero-output.

It is important to pay attention that the wires are securely fastened and do not dangle. Otherwise, there is a possibility that they will begin to overheat over time, which is no longer safe. The connection diagram for a voltage stabilizer in a private house is presented below.

The connection of a 220 V voltage stabilizer in the apartment panel is carried out according to a similar scheme directly after the electricity meter.

Resanta Sai 220 diagram and faults - studvesna73.ru

Welding machine RESANTA SAI 220 is well suited for home use. The equipment operates on the principle of converting electricity with a frequency of 50 Hz into a voltage of 400 V; modulation is used for regulation. The inverter circuit is not very complicated; the design consumes up to 6.5 kW. The high operating voltage of 80 V allows the use of different types of electrodes.

Peculiarities

Features of RESANTA SAI 220:

• Adjustable output current from 15 to 220 A allows you to work normally with materials of different thicknesses.
• The light indication on the front side will help you track the status of the device. The circuit breaker and power switch are located on the rear panel.
• The body is made of metal.
• Cooling is carried out by forced ventilation through the hole; if it is closed, the device will fail.
• Overheat protection is triggered automatically and displayed on the front panel; you must immediately check the cables for short circuits and do not turn off the device for 5 minutes.
• To start welding, it is necessary to ignite the arc, often this is accompanied by sticking of the electrode. To prevent this from happening, the device is equipped with the “Anti Stcik” function. Which smoothly increases the current on the electrode. Subsequently, the voltage is supplied in normal mode.
• The “Hot Start” function increases the voltage at start-up to quickly obtain an arc at the very beginning. This allows for shorter initial preparation.

• The inverter cannot be used in a room with high humidity or during rain.
• Using a power saw, drill, or grinder near operating equipment can result in metal dust getting inside and causing damage.
• If the insulation on the network and welding cables fails, work must be stopped until the damage is corrected.
• Before turning on the inverter for the first time in a new room, it must be left for 2 hours to prevent the appearance of condensation.

• To avoid electric shock, it must be connected to a grounded outlet.
• Welding work should take place in a well-ventilated place.
• To protect against thermal burns, all work must be carried out in a hat, protective gloves and special clothing.
• Eye and face protection is provided by a welder's mask.

Scheme of welding inverter RESANTA SAI 220

The circuit diagram of the RESANTA SAI 220 device is built on the UC3842BN microcircuit. Powerful FQP4N90C transistors are used, the gate of which is isolated.

• Voltage - 220 V.
• Electrode diameter - 5 mm.
• Arc voltage - 80 V.
• Current consumption - 30 A.
• Weight - 5 kg.
• Protection class - IP21.

• Welding inverter.
• Shoulder strap.
• Ground terminals.
• Electrode holder.

Safety measures during repairs of electrical household equipment.

For any type of work, it is mandatory to have a head biret cap, glasses, gloves, and special clothing. These special attributes will protect you from any particles, metal shavings, dried varnish, solvent, pieces of plastic, dried paint, etc. Contact with the head, eyes, face, body skin. When unwinding various types of household welding machines, cases, boards, chassis, radiators, plastic strips. Any particle can break off and end up in the lines listed above. Well, the most important thing is a good mood, endurance and desire to do this type of work. In service workshops or at home, you should have everything you need available. Tools and devices, a set of screwdrivers of various configurations, wire cutters, pliers, special clamps, tweezers, etc. A soldering station and a soldering gun are an essential tool for the job, as in today's devices. Most electrical boards are assembled on SMD parts, where they cannot be soldered with a simple soldering iron, and are too small in size.

A multimeter is also a very necessary device, for these purposes, measuring voltage, resistance, checking transistors, diodes, capacitors, LEDs, transformers, switches. An oscilloscope is also an important device when repairing household appliances. With this device you can achieve good characteristics and parameters in household and welding equipment. A desktop magnifier is a very necessary and important tool for specific work purposes. Today's manufacturers produce very small radio components that cannot be done without this tool. Further

Reading time: 4 minutes

The Resanta welding machine model SAI-220 is very popular among beginners and practicing welders. The technical characteristics are sufficient for full-fledged study and simple repairs at the dacha. The manufacturer positions this device as a household device, and therefore you should not expect miracles from it. But for simple tasks this inverter is more than suitable.

In this article we will tell you in great detail everything you need to know about SAI-220. You will also see the diagram of the Resanta SAI 220 welding inverter. And it will definitely be useful to you if you decide to carry out minor repairs or assemble a similar device with your own hands.

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