Reviews and technical characteristics of Resanta SAI 220

Advantages of the welding machine Resanta SAI 220

• The welding inverter Resanta SAI 220 has high power with compact dimensions;
• The cost of the product, in comparison with competitors with the same parameters, is more affordable;
• The equipment easily connects to a standard household network and works even at maximum settings without interruption;
• A good cooling system allows you to achieve continuous operation time of up to 70% at maximum power;
• There are no problems with the selection of accessories, repairs and other maintenance procedures;
• The inverter welding machine SAI 220 is characterized by reliable operation and produces high-quality seams.

Recommendations for working with the device

The device is used for effective welding of carbon alloys, as well as stainless steel. If there is a need to weld small parts, you can connect the device to a household outlet.

It is not recommended to close the ventilation openings while working with the device, as this will lead to overheating.

To ensure full operation of the device, it is best to properly prepare it for welding. Before turning on the unit, you need to determine that the network switch is in shutdown mode. Grounded wires and an electrical holder are connected to the power connectors. At the next stage, the inverter is connected to the power grid.

Initially, the lowest welding current is set. To start the unit, you need to click on the Network toggle switch. After this, the current is adjusted. After welding, the current is reduced to a minimum. The switch turns off the device, and after that the welding cables and wires are disconnected from the power supply.

Flaws

• The ground wire does not have a very good design;
• Despite the high power of the fan, the blades are made of fragile material;
• The adjustment scale that the Resanta SAI 220 inverter welding machine has does not display the correct current value;
• The knobs rotate too easily, making settings easy to change with careless movements.

Technical characteristics of the welding machine Resanta SAI 220

The main thing that welders pay attention to when choosing equipment is the operating parameters. Here they look like this:

Welding machine diagram

The need to know the circuit diagram of the device arises in cases where it requires repair. Without knowing the exact location of each part, intervention can only cause harm. The circuit diagram of the SAI 220 welding inverter is as follows:

Scheme of welding machine Resanta SAI 220

Device

This model contains the following elements:

• Radiator transistors, in the amount of several pieces, which occupy about 20-25% of the entire circuit;
• The output rectifier radiator is the largest one, which ensures the operation of the secondary rectifier;
• Primary rectifier – converts the current coming from the network;
• Secondary rectifier – converts the current coming from the inverter;
• Cooler – cooling system devices;
• Current sensor – showing current parameters;
• Soft start relay – serves for easy start of the device;
• Interference filter;
• Integral stabilizer - helps maintain parameters in one position, despite voltage surges.

Principle of operation

The design and operating principle of the welding inverter are interconnected. All processes occurring in the inverter are carried out in the following sequence:

• From the network, the current passes through the wires to the primary rectifier in the inverter. There it is converted from variable to constant.
• Next, the voltage decreases from standard 220 V to a lower value, which is set in the settings of the device itself. At this stage, the current turns back into alternating current. Its frequency increases significantly and it also becomes high-frequency.
• After this, electricity is supplied to the inverter transformer. Here the voltage again decreases to the state required at the output. This is required to increase the current strength, which affects the welding temperature.
• At the very end there is a secondary rectifier that converts the current to direct current. Here all the values ​​​​already correspond to the specified parameters.

Device malfunctions

If the inverter is used incorrectly, malfunctions may appear in the form of:

• Overheating and failure of the power supply. If this breakdown occurs, you need to contact a service center, especially if the device is under warranty.
• Turn off the fan. It is recommended to stop the operation of the device, otherwise the unit will overheat.
• Long flashing of all indicators during initial startup of the unit.
• Equipment stops after a clicking sound. You can carry out repairs yourself. The adjustable linings and all relays are checked in accordance with the diagram. If one of the ends of the wiring is burnt, this may cause a problem.
• Punching through the mass when turned on. It is recommended to check the wiring, which may be damaged.
• Two indicators blink, the relay activates and the fan turns on. After one second, the unit turns off and the process repeats. To eliminate the problem, the resistance and output transistors are checked.
• Excessively weak material used to make the fan, causing it to break into pieces.

You can fix a large number of inverter malfunctions with your own hands. But, if you need to replace spare parts, then in the absence of appropriate experience and knowledge, it is recommended to seek help from a specialist.

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.

Resanta 220A board GP-35 output 80 volts no current adjustment

Good afternoon They brought an inverter device with 4 burnt-out FGA60N60UFD transistors,

• I installed FGH40N60SMD.
• Replaced the burnt resistance 51 ohm 12W.
• Replaced broken RHRP1560 diodes
  Visual inspection and testing with a multimeter did not reveal anything burnt or broken. Before installing the transistors, the FGH40N60SMD turned on the device, the fans started spinning, the green and yellow lights came on. I took oscillograms at the points

  Signal - PWM on 2nd leg A3120

  **

  Read also:  Equipment for gas-shielded welding and its main characteristics

  Base - Emitter on D31_1 and D32_1, the oscillograms are the same, on the upper and lower arms

  I installed the FGH40N60SMD in place and turned it on and measured the oscillograms again. on transistors D31_1 D31_2 the oscillogram is slightly distorted, but on D32_1 D32_2 it is normal.

  When turned on, both the green and yellow lights came on, and I found a broken 4.7V zener diode on the control board.

  After replacing the yellow light went out and 80 volts appeared at the output, I connected a J78 220 volt 150W lamp and the output voltage dropped to 50 volts. The current regulator does not regulate either the current or the voltage at the output with or without a load.

  After 10 minutes of idling without load, the transformer with the EE65 13:4 series sticker heats up

  Voltage at control board terminals 1=3.9V; 2=7.15v; 3=6.53v; 4=13.32v; 5;6;7=0.00v; 8=14.50v; 9=0.03v; 10=4.98v; 11=0.09v; 12=0.10v; 13=2.33v; 14=0.16v; 15=15.14v On the control board I replaced 3845B and MC33074DG, the result is the same, no adjustment. Testing of diodes, transistors, zener diodes, resistors did not reveal any faulty ones

  I ask for help on which circuit specifically to call and whether the transformer should heat up at idle.

Source

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.

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.