The welding machine "Resanta SAI-250" is designed to perform manual arc welding using coated electrodes. The inverter is developed by the company of the same name located in Latvia. The assembly of the welding machine is carried out in the DPRK, which is reflected in its quality: all parts are perfectly fitted, there are no gaps, creaks and backlashes.
The principle of operation of the welding machine
The main task of the Resanta SAI-250 welding inverter is the conversion of alternating current with a frequency of 50 Hz to direct current, the voltage reaches 400 V. The wide-pulse modulation of the resulting high-frequency voltage allows such devices to regulate the welding current.
Design
On the front panel of the metal housing "Resants SAI-250" are placed power connectors. Indicators are connected to them, with the help of which the network parameters and the indication of overheating of the device, welding wires and the regulator for choosing the value of the welding current are controlled.
The Resanta SAI-250 inverter is equipped with a forced ventilation system that removes hot air from under the deviceās body through special openings. The welding machine is reliably protected from overheating during operation thanks to such an effective protection system.
An additional protection system automatically turns off the welding machine in the event of a short circuit of the power wires between them. The user is warned about such an incident by a special signal lamp that lights up on the instrument panel.
Inverter Special Features
The effectiveness and ease of use of āResource SAI-250ā is largely due to two important functions: āHot startā and āAnti-stickingā.
The ignition of the electric arc of the welding machine occurs instantly due to the first function, implemented by automatically increasing the welding current, which saves the user from additional actions. The Anti-stick function automatically reduces the welding current when the electrode sticks to a metal surface when the arc is ignited. After eliminating such sticking, the inverter increases the current strength to the set value. Both functions are very useful and convenient in operation, which is confirmed by the reviews left on the Resanta SAI-250 welding machine.
Inverter Features
The welding machine is intended for domestic use, since the Resant SAI-250 circuit and its design ensure reliable and safe operation even with significant surges and voltage surges. The inverter allows manual arc welding even with a minimum voltage.
The maximum diameter of the electrodes that can be used when working with Resanta SAI-250 is 6 mm. The current strength is adjustable over a wide range, but the upper limit is 250 A. The welding machine can withstand high loads for a long time thanks to protection systems. The Resanta inverter, by its characteristics, bypasses many similar models of welding machines offered on the market.
The voltage in idle mode of the inverter is 80 V. Built-in transistors of the IGBT series guarantee a long service life of the welding machine even if it is used frequently at high loads. The protection level for this inverter model is IP21.
Mobility and compactness "Resants SAI-250" greatly facilitates its use. A convenient handle located on the inverter housing allows you to quickly and easily carry it from place to place on the job site. Reviews about "Resant SAI-250" note the accuracy and ease of configuration of all parameters. The advantage of the device is that even with significant power surges, all the specified settings remain unchanged.
Specifications
The inverter has the following technical parameters:
- Operation of the welding machine can be carried out at a temperature of from -10 to +400 degrees.
- The limit value of the current consumption is 35 A.
- Adjustment of the working welding current is carried out within 10ā250 A.
- The voltage of the welding arc formed by the inverter of this model is 30 V.
The welding machine operates both from a centralized electrical network and from a gasoline generator with a capacity of at least 5 kW. When choosing electrodes for welding, it is necessary to take into account the fact that when the input voltage decreases, the value of the welding current also decreases.
Preparing the device for use
It is not difficult to prepare the Resanta SAI-250 inverter for operation - it is necessary to adhere to a certain sequence of actions in order to prevent emergencies. First of all, a negative grounding wire and a wire with an electrode holder are connected to the device. After that, the minimum level of welding current is set using the regulator. The inverter connects to the mains and starts only after completing these steps.
In the instructions for use of the welding machine, the manufacturer indicated the current strength required for a particular type of electrode.
After completing all welding work on the inverter, the minimum current value is again set, after which the device turns off and disconnects from the electrical network. Cables are disconnected from the device only after it is switched off.
Welding equipment safety
Before starting operation, it is advisable to leave the inverter for several hours indoors at a positive temperature. Such a precaution will prevent the formation of condensation in the device, which can cause a short circuit. In addition, it is necessary to monitor the integrity of the insulation of the welding cable and the connection wires. Damage to the insulation layer not only contradicts the safety requirements, but can also cause the apparatus to fail.
You cannot use the Resanta inverter in rooms where work is carried out, accompanied by the formation of small metal chips and dust. Such inclusions can get inside the device and disable it. Also, the inverter cannot be used outdoors during rainfall or in rooms with high levels of humidity.
When working with welding equipment, it is advisable to adhere to several basic rules:
- The place where welding will be carried out should be well ventilated and have access to fresh air.
- The fire safety rules must be taken into account.
- During work, it is necessary to use special protective clothing, a welder's mask, a hat and tight gloves. Such products will help protect your skin and eyes from burns.
Inverter storage conditions
Welders must be stored under certain conditions. The room in which the inverter will be located should not contain acid and alkali vapors, a large amount of dust and other suspended matter in the air. The welding machine must be stored under conditions that meet the following requirements:
- The ambient temperature should be between -10 to +50 degrees Celsius.
- Ambient humidity level - not to exceed 80%.
Is it possible to repair the welding inverter yourself?
Both domestic and foreign experts note the large service life of the Resanta SAI-250 welding machine. Active operation of the inverter in compliance with safety precautions and all relevant requirements can continue for years, however, like any other equipment, it requires regular repair.
It is worth noting that both unscheduled and preventive repair of such equipment are best trusted by specialists. Maintenance of welding equipment of this brand is carried out by numerous authorized workshops. However, the user can perform simple repair work independently.
Such repair work is carried out most often in cases where the inverter overheats, as indicated by the indicator located on the front panel. It is easy to eliminate such a problem - it is enough to clean the internal surfaces of the welding machine from dirt and dust.
Poor, unsatisfactory operation of the welding inverter, reduced power can be associated with a low voltage of the electrical network or the use of wet electrodes. The problem of reducing the power of the apparatus associated with raw electrodes can be eliminated easily and quickly: it is necessary to thoroughly dry all the electrodes.