Resanta SAI-220 – diagram, faults, reviews, characteristics of the welding inverter

Among the variety of models of welding inverters of a well-known brand, the Resanta SAI-220 device is considered one of the most popular. In terms of technical characteristics and functionality, the inverter of this model can be classified as a device of both household and industrial type; it occupies an intermediate position between them.

Welding inverter Resanta SAI-220A and a convenient case for storage and transportation

It is thanks to these characteristics that this inverter can be equally successfully used both by professionals in their field to perform welding of increased complexity, and by novice welders taking their first steps in their profession.

Scope and technical characteristics

The Resanta SAI-220 welding inverter is a device operating from a single-phase electrical network with a voltage of 220 V. A direct current is generated at the output of the device, which is used to perform electric arc welding using consumable coated electrodes. If it is necessary to weld parts of small thickness, then such a device can even be connected to a regular household outlet (of course, provided that the electrical panel is equipped with machines that can withstand the current consumed by the device).

Using this inverter, you can not only effectively weld parts made of carbon steel, but also work with stainless steel and other alloy steels.

Although all Resanta brand inverters are manufactured in China, the circuits, construction and design of these devices were developed in Latvia. The brand name was also invented here, which today is well known to welders in many countries around the world. Among the technical characteristics of the welding machine in question, the following should be highlighted:

welding current control range – 10–220 A;
supply voltage value - 220 V (permissible deviations of the supply voltage can be 10% on the positive side (242 V), 30% on the negative side (154 V));
the current consumed by the device at peak load is 30 A;
open circuit voltage – 80 V;
rated operating voltage – 28 V;
ON duration (DS) when working at maximum welding current (220 A) – 70%, at welding current 10–140 A – 100%;
the diameters of the electrodes used are 1.6–5 mm;
protection class – IP 21;
inverter weight – 4.9 kg.

The listed characteristics explain the large number of positive reviews about this inverter.

The required value of welding current for the SAI-220 machine is set in accordance with the diameter of the electrode

In addition to the inverter of the specified model, its modification is presented on the market - Resanta SAI-220 PN. The difference between the Resanta SAI-220 PN inverter and the base model is that it allows welding to be carried out efficiently even at an even lower voltage - 140 V. In addition, the design of the Resanta SAI-220 PN has a digital indicator of the welding current, which makes work at more convenient. Naturally, the cost of the Reasant SAI-220 PN welding machine is slightly higher than the price of the basic inverter.

Front panel of the Resanta SAI-220 inverter with a digital display and a transparent protective shield

It is worth dwelling in more detail on such a remarkable parameter of the device in question as the on-time period (OP), or the period of continuous operation (LOP - load duration). As mentioned above, for the inverter in question it is 70% when operating at maximum welding current and 100% at current in the range of 10–140 A. This means that if you are going to weld at maximum current, then for a period equal to 10 minutes, you will need to take a break for 3 minutes, and the remaining 7 you can work quietly.

Such a break is necessary so that the electronic circuit of the device, the elements of which are intensely heated during the welding process, cools down. Otherwise, the device may automatically turn off if the thermal protection is triggered, or simply burn out. If you use a current whose strength is in the range of 10–140 A, then there is no need to interrupt the operation of the equipment.

Resanta SAI-220 inverter circuits

Below are the electrical diagrams of the SAI-220 inverter welding machine. For ease of study, it is better to download the images to your computer in order to easily enlarge them to the desired size, since the sizes of some circuits will be too large for small monitors.

Electrical diagram No. 1 (click to enlarge)

Scheme No. 2

Scheme No. 3

Scheme No. 4

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.

The versatility of the Resanta model 202 inverter, ensured by its design features, is also a big plus. For example, this inverter can be used to connect parts made of different types of steel, including stainless steel.

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.

Disadvantages of the Resanta model 220 inverter

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.

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.

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.

Sergey N. I use this welder for home work, in general there are no complaints, for not too thick metal it is the best option. It also handles thin stainless steel, which is nice. The convenient thing is that the device is lightweight and there are no problems carrying it around the site. Reliable, I accidentally dropped mine several times, nothing, it works. The wires in the kit are short - this is their problem, but this problem can be solved very easily with the help of an extension cord, for which it is better to use 1.5 wires and PVA. Overall, I’m happy with the device, I don’t know how it’s suitable for larger purposes, but it’s quite suitable for home use.

Ivan Sokolov had never done welding before, but when he bought a house, he realized that he had to learn. In your home and on your property, you always need to fix or weld something, but you don’t have enough money to call the experts with their own equipment. I spent a long time choosing which inverter was best to buy in order to quickly learn how to work with it; friends recommended the 220th Resanta. Of course, the first attempts to work on it did not make me very happy, the seams turned out so-so, and burns happened, but quickly enough everything began to work out. Its anti-sticking and fast arc ignition functions are very helpful when working on this machine for a novice welder. Now it’s been six months since I’ve been using this inverter, I’ve gained so much experience that even some neighbors started asking them to help when they need to weld something. In general, everyone is happy, especially me.

Vladimir, Tver I inherited this inverter from our disbanded construction team. For intensive use and for work on heavy and thick metal structures, it is better to choose a more serious welder. Although he never let us down at a construction site, sometimes it felt like he was working to the limit. But for the home - just right. I used this device for installing heating, and for making the frame of a greenhouse, and I installed a new fence with a gate - there are no complaints, with 3-4 electrodes it feels great, the arc does not go out, the electrode does not stick, the seams are of high quality. We are pleased with the compactness of this inverter, as well as its light weight, which is especially important if you have to constantly move it from place to place.

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.

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.