What kind of inverter is better for air compressor transformation?

You can try Sifang Electric's special inverter integrated cabinet for air compressors, the effect is very good, and the wiring is also convenient.

Siemens' inverter is better

The air compressor is transformed into a frequency converter, and the transformation idea is:

1. The air compressor with variable frequency conversion has variable load, and the air compressor without transformation has a foundation load;

2. Operation plan: The unloading pressure of the air compressor with basic load is appropriately increased, and this part of the air compressor has been working at full load. The inverter air compressor has variable load, which is adjusted in real time according to the pressure of the gas storage tank.

3. Frequency conversion transformation scheme: the original controller and control loop and protection of the air compressor are not changed, the frequency converter is added to the entrance of the main contactor, the starting process remains unchanged, and the frequency converter (independent plus controller) is started after the star-angle conversion is completed, and the unloading pressure of the original controller is appropriately set high to ensure that the inlet valve and the rotary valve are at the maximum output, and the pressure regulation is controlled by the frequency converter.

In fact, there is no point in changing the frequency, it is better to buy a smaller inverter to use in combination. Tossing blindly, losing one's life and money.

Sifang's air compressor special all-in-one machine is very good, this year our factory has changed 2 sets, and the effect is very good. Like one!

What brand are you using now, this should be a good brand. Such as Sifang, Huichuan and so on.

What kind of power air compressor are you using? If the usual gas consumption is less than the gas storage capacity of the air compressor, that is to say, the no-load time is relatively long, then it makes sense to install frequency conversion. The exact amount of savings depends on the operation of the machine.

What kind of inverter to install depends on the situation of your machine, otherwise it is easy to burn the inverter. It is best to use the special frequency conversion of the air compressor. Our company has a special air compressor transformation service.

You can contact me if you need to.

One is that the power should be large enough, the air compressor is heavy-loaded, and the parameters should be adjusted well, and the bottom frequency should be left.

It is necessary to evaluate before changing the frequency, and it is not necessary to save power if it is changed.

It depends on the actual situation. 0731-83575597

The biggest difference between inverter and fixed-frequency air conditioner is that the operating principle of the compressor is different. If the indoor does not need a lot of cold and heat, the air conditioner will run in a low-frequency state, intelligent constant temperature control, and the fixed frequency needs to be adjusted on and off of the air conditioner under artificial circumstances. The air compressor recommends Tianshui Jufeng's fixed screw air compressor.

Tianshui Jufeng's fixed screw air compressor exhaust pressure: , exhaust volume: 3 min, motor power range:

Economical operating costs, the system adopts stepless adjustment of 0-100% exhaust volume. When the gas consumption decreases, the exhaust volume decreases, and the current of the motor also decreases. When the gas is not in use, the air compressor runs empty, and the empty car will automatically stop for too long. When the gas consumption increases, the heavy vehicle is resumed.

Excellent energy-saving effect.

If you want to know more about the screw air compressor, it is recommended to consult Tianshui Jufeng. Tianshui Jufeng's business philosophy is to take customers as the guide, marketing as the center, and brand management as the operation mode to achieve diversified brand management and create the brand image of Tianshui Jufeng. Tianshui Jufeng takes "first-class, first-class, and timely service" as the goal of Tianshui Jufeng.

The easiest way for you to understand the air compressor frequency conversion and constant frequency is to compare the air conditioner, the early air conditioner is power frequency, and the air conditioner produced in the last ten years is also frequency conversion, the biggest effect is to reduce energy consumption.

The air compressor is the same, the biggest difference between frequency conversion and constant frequency is energy consumption, the air compressor of frequency conversion can save more than 20% of energy consumption compared to the power frequency, and his power-saving principle is the same as that of frequency conversion air conditioner. Among them, the more well-known brands of inverter air compressors are Dehaha, Baode, Red Wuhuan and so on, and imported brands are Kaishan, Ingersoll Rand, Atlas and so on.

Adjustment method: If it is a resettable type of spring, then there should be something at the top that can rotate, turn up to increase the pressure, and turn down to adjust the pressure.

Tighten the screws on the top of the safety valve downward, but not just tighten it all at once, but adjust it slowly. It's dangerous, though.

The safety pressure of the safety valve is adjusted by the local technical supervision department, and it is recommended to ask a special person to come and adjust it.

General method: Generally speaking, the air compressor is automatically started at low pressure and stopped automatically at high pressure. No matter what kind of air compressor, there is generally a pressure switch or pressure sensor to achieve automatic control.

Therefore, if you need to adjust the pressure of the air compressor, you only need to adjust the action range of the pressure switch and the starting pressure set on the sensor.

The pressure switch has a range and diffe, which can be adjusted according to the need, and the diffe is generally not moving. If the pressure sensor is to be adjusted, only the set start-stop pressure value is adjusted, not the pressure sensor itself. If there is a display panel on the air compressor, there is generally a set pressure, in which the value is adjusted to change the start-stop pressure.

Precautions for upgrading:

1.The pressure switch of the air compressor must be adjusted by professionals, and cannot be adjusted arbitrarily by general users.

2.The air compressor has a rated working pressure, which refers to the pressure when disconnected, for example, the general air compressor uses a pressure of 7kg cm2, and the maximum pressure when disconnected cannot exceed 7kg cm2 to avoid danger.

Different air compressor switches have different adjustment methods, one is that the pressure difference is fixed by the switch itself, only adjusting the automatic shutdown pressure and adjusting the high pressure. This kind of switch has two slotted screwdriver knobs on the switch, and the two knobs must be adjusted consistently, otherwise they will stop when they move together, stop and start again, and burn out the electrical appliances. The other is a regulating starting pressure (low pressure) and a regulating machine pressure (high pressure).

Air compressor pressure adjustment:

1. Rotate the pressure adjustment screw as smoothly as the hour hand, and the closing and breaking width opening pressure increase synchronously.

2. Rotate the pressure adjustment screw counterclockwise, and the closing and disconnecting pressure are synchronized to reduce the slag tanqing.

Air compressor differential pressure adjustment:

1. Rotate the differential pressure adjustment screw clockwise, the closing pressure remains unchanged, and the disconnection pressure increases.

2. Rotate the differential pressure adjustment screw counterclockwise, the closing pressure remains unchanged, and the disconnection pressure decreases.

Pro, can the ordinary air compressor be changed to a frequency converter as follows: you can't add a frequency converter The core of the ordinary screw air compressor is the power frequency motor, and after the inverter is forcibly installed, the frequency adjustment range is only 25Hz 50Hz, and the energy-saving effect is very limited, but it can achieve the effect of soft start. In the actual use of industry, it is often seen that the speed of the motor is reduced, and then the heat dissipation effect is greatly lost, and it is even possible to burn the motor.

The fuel injection volume of the main engine of the ordinary screw air compressor is "fool-type", when the screw speed drops, it will not be adjusted, and the fuel injection will continue to be injected according to the set amount, which will produce emulsification, resulting in damage to the bearing and the host due to moisture, and the life will be greatly reduced! Ordinary screw air compressors usually use PID closed-loop program-controlled control system, and the installed inverter control system and the pressure signal sensor of the machine and other systems cannot achieve good synchronous matching, which will cause a series of phenomena such as slow signal transmission and disorder and disordered frequency during operation, and increase the equipment failure rate. Ordinary screw air compressor manufacturers generally do not support the installation of external inverters.

The installation of inverter is generally only suitable for the transformation of single-stage compression air compressor, and the two-stage compression is especially not applicable, because the two-stage compression is driven by 1 low-power motor through the size of the pure gear to drive the overload operation of the 2 hosts, and the frequency conversion transformation is more likely to cause the phenomenon of burning the motor and will greatly reduce the transmission efficiency.

There is a certain difference between the special inverter for air compressor and the ordinary inverter. The special inverter for air compressor generally has the following characteristics:

It can adapt to high load and high temperature environment, and can ensure the stable operation of the air compressor for a long time.

With higher accuracy and faster response speed, it can better control the operating status of the compressor.

With stricter protection measures, it can effectively protect the motor and mechanical parts of the compressor.

It has higher reliability and stability, and can meet the needs of long-term continuous operation of air compressors.

The ordinary inverter may not be able to meet the special needs of the air compressor, so it is necessary to choose according to the actual situation when choosing the inverter.

Hello, glad to answer for you. <>

The inverter air compressor does not use the inverter, which will have a few impacts; Waste of energy: The use of a fixed frequency motor to start and stop directly will produce a large current impulse and starting current, resulting in a waste of energy. Loud noise:

The shock and vibration caused by the moment of start-up can cause loud noise, which can affect the surrounding environment and staff. High maintenance cost: the fixed frequency motor starts and stops a lot, which is easy to damage the mechanical parts of the motor and increase the maintenance cost.

Unstable air pressure: The output power of the motor with a fixed frequency is uncontrollable, and the stable control of air pressure cannot be realized, which affects the subsequent treatment and use of liquid gas.

Sanjing S350 in the application of air compressor energy-saving transformation in the design of frequency conversion system precautions.

1. The air compressor is a large moment of inertia load, which can easily cause overcurrent in the inverter of V F control mode when starting, so a vector inverter with large starting torque and strong overload capacity should be selected. The overload capacity of the S350 series reaches 180%, and the starting torque can output 150%, which can ensure the reliable and stable operation of the equipment and the continuity of constant pressure air supply.

Take a factory in Jiangmen as an example: the factory uses Kaiqu brand air compressor, motor 22kW, equipped with S350 22kW general vector inverter. The acceleration time is set to 15s and the deceleration time is 6s, and it can still start and run normally (upper limit.)

Starting pressure 0MPa

Starting current A 36 42 60

Operating current A 33 38 55

2. The air compressor is not allowed to run at low frequency for a long time, if the speed of the air compressor is too low, on the one hand, it will make the working stability of the air compressor worse, and on the other hand, it will also make the lubrication conditions of the cylinder body worse and the wear will increase, which will lead to the phenomenon of fuel injection. Therefore, the lower limit frequency of the air compressor should not be less than 20Hz, and the deceleration time should be as short as possible. The S350 has a voltage fluctuation range of 15%, high withstand voltage, and short deceleration time, which can avoid fuel injection caused by too long deceleration time.

3. Under the requirements of the production process, the lower the pressure setting, the better. Because the higher the pressure of the air compressor, the more power required for the motor shaft and the more power it consumes.

4. The outlet release valve is all closed, and the way of adjusting the air supply with the outlet release valve is canceled to avoid the waste of electric energy caused by it.

At present, the air compressor is being transformed into a frequency converter, and the inverter is connected in series between the power supply and the original star triangle circuit, and the design idea is to wait for the original control system to be started.

After (the main circuit is not powered, and the star delta contactor is completed), the inverter starts to output, and the air compressor starts to run at the frequency conversion.

Now I encounter a problem: every time the frequency conversion starts, the original control system reports "the host is overloaded", the star-delta contactor is disconnected, and the frequency conversion start cannot be completed.

Analyze the possible reasons by yourself: the current sampling signal of the original controller is located on the motor side, which is interfered by frequency conversion, resulting in the wrong measurement model and then malfunctioning. (Inverter 90kw, motor 75kw).

Please help analyze whether there are other possibilities and how to solve them. (It is stated in advance that it is not feasible to move the current transformer above the inverter considering the actual situation on site).

The scheme is still correct, and a transfer switch can be added. After the transformation, the frequency can be as low as 25hz, and some say that it can be reduced to 20, but I haven't tried it. However, it should be noted that for the air-cooled model, the fan motor has been running at the power frequency to avoid high temperatures.

Hello, I can't help you with this question. But our company is an inverter and has rich experience in the transformation of air compressors.

Call our nationwide toll-free service** at 400 887 1011

Hope it helps. Thank you.

Your solution is feasible, but there is a slight problem, if you are using a PLC screw compressor, you need to use the original protection. The inverter has to be started when the motor is started (it starts running when the Y star is started), or the PLC will detect it as a lack of phase. As for the lubricating oil, there is no problem, because the lubricating oil is supplied by pressure.

In the air compressor, when the inverter drops to 30Hz, the rated current of the motor is basically reached. As long as the frequency decreases, there is an energy-saving effect, but it is more obvious at 30-40Hz, and there is no problem if it is a screw. However, the round-trip piston type cannot be used in parallel, which will make the pressure sensor unstable and the frequency of the inverter fluctuates greatly.

"As long as the inverter is installed, you can save energy" is a misunderstanding. From what you have described now, you may have deliberately set the maximum operating frequency of the inverter or lowered the air supply pressure of the compressor system on the pressure "PID" controller in order to highlight the energy saving when installing the inverter. For example, if I am a fan manufacturer, in order to save energy in order to save energy after installing an inverter, I may set the maximum operating frequency of the inverter to "45Hz".

In this case, your air pressure is not enough, and the inverter can only run at a maximum of 45Hz, so the corresponding speed of the air compressor will be reduced. If the pressure rises to meet your gas needs, you only need to increase the maximum operating frequency of the inverter or adjust the pressure controller (the pressure controller is a small controller matched with the inverter, it will display the pressure value, and some of the inverter itself has a control function, you can look at the manual of the inverter.) ) pressure target value.

But when you turn up these parameters, the equipment is not necessarily energy-efficient, that is, it is useless to install an inverter. Of course, it may also be that the parameter settings are unreasonable, and you should clearly put forward the gas supply requirements to the equipment supplier, which is very important.

If your equipment used to be frequently loaded and unloaded, then there is room for energy savings in the inverter.

Now it has been in the loading state because your air supply pressure is not enough, which is the normal state of the air compressor.

This is often the case in the application of frequency converters.