What are the conditions for a normal inverter to operate?

Operating conditions of the inverter:

Operating temperature. The inverter is a high-power electronic component, which is very susceptible to the influence of working temperature, and the product is generally required to be 0 55, but in order to ensure the safety and reliability of the work, there should be room for use when considering, and it is best to control it below 40. In the control box, the inverter should generally be installed in the upper part of the box, and strictly abide by the installation requirements in the product manual, and it is absolutely not allowed to install the heating element or the component that is easy to heat up close to the bottom of the inverter.

However, in actual work, especially in the case of overhead introduction of power cables, the absorption network of the inverter alone cannot meet the requirements. In the lightning active area, this problem is particularly important, if the power supply is an overhead incoming line, install a special lightning arrester (option) for frequency conversion at the incoming line, or there is a special grounding protection for embedded steel pipe 20m away from the inverter according to the requirements of the specification. If the power supply is imported by cable, the lightning protection system in the control room should be done to prevent lightning from entering and damaging the equipment.

Practice shows that this method can basically effectively solve the problem of lightning strikes.

The motor cannot be larger than the inverter, and the motor cannot be overloaded.

Hello, this question depends on the specific situation. First of all, the inverter you choose must be commensurate with the power of the motor you carry, equal to or greater than that. Then you need to explain how the inverter works.

Finally, you should pay attention to the following points before the operation of the inverter: 1. The wiring of the main circuit terminal of the inverter, including power input, power line output, DC bus, braking unit, and braking resistor wiring. 2. The wiring of the terminal of the inverter control circuit is controlled through the panel, or through the remote terminal, etc.

Mainly the upper computer. 3. Check whether there is a short circuit in the line. 4. Power on and adjust the parameters before running.

If you are unclear about the above points, please ask carefully.

What conditions should be met for the start of the inverter? The first is the start signal, the second is the forward and reverse signal, and the third is the frequency given signal.

The frequency converter runs for a long time, and the minimum frequency cannot be less than how much.

For example, the ABB inverter can keep 0Hz running. However, the performance of the motor will deteriorate at low frequencies, and a very good motor is required to maintain stable operation at 0Hz. For inverters, it must be high-end inverters, such as ABB's ACS880, ABB's ACS800, and Siemens' S120 series to achieve such performance.

But even if the performance of the inverter is very poor, 0Hz is at most very poor performance, but it will not damage the inverter. However, for the motor, it must be a strong cold frequency conversion motor, not a motor of a coaxial cooling fan.

The reason why the actual operating frequency of the inverter cannot reach the given frequency is that at low frequency, due to the low output voltage, the torque is significantly affected by the voltage drop of the stator resistance, so that the maximum output torque decreases and the frequency decreases.

In addition, its dynamic torque ability and static speed regulation performance are poor, and the system performance is not high, the control curve will change with the change of load, the torque response is slow, the motor torque utilization rate is not high, and the performance is reduced due to the existence of stator resistance and inverter dead zone effect at low speed, and the stability deteriorates.

The upper frequency fh is the maximum operating frequency preset according to the production needs, and it does not correspond to a given signal x.

When FHFMAX, the maximum frequency that the inverter can output is determined by FMAX, and the upper frequency does not work.

As shown in Figure 5-42, assuming that a given signal is a voltage signal of 0 10 V, the maximum frequency is fmax=50Hz, the maximum given frequency is fxm=52Hz, and the upper frequency is fh=40Hz. Then:

The starting point of a given frequency line is (0,0) and the end point is (10,52). That is, if the maximum given frequency is not equal to the maximum frequency (fxm≠fmax), then the end point of the frequency given line is determined by the maximum given frequency fxm, but the actual maximum output frequency cannot exceed fmax (50Hz);

The maximum frequency of the actual output of the inverter is 40Hz. Here, it doesn't matter how big the given signal xh is corresponding to the upper frequency (40Hz).

There are two types of frequency control for the frequency converter, one is given by the operation panel, and the other is given by the control terminal. Among them, the control terminal can be subdivided into: analog control terminal (through 4-20mA current or +-10V voltage, etc.), digital control terminal (multi-stage speed setting), and network control command word (Ethernet, industrial control network, etc.).

By controlling the terminal, a given frequency generally needs to be set accordingly for the inverter parameters or supported by matching accessories. For example, digital control needs to set which control terminals are effective through the parameters of the inverter. Network control requires the inverter to be configured with the corresponding network expansion card.

You first restore the factory settings (copy the parameters before this operation), if it can be normal, and then set the parameters, if it can't be restored to the factory, it is a hardware failure.

Suspect that the frequency is not given in, this is supposed to be the starting frequency, you restore the factory value to try, with the operation panel, if it doesn't work, it means that there may be a problem with the module.

This situation is a bit similar to my previous inverter, I gave the analog value is 0-10v, but when it is only 3v, it reaches 50hz, the upper limit frequency is also set at 50hz, and the frequency is still beating in your case.

The analog voltage input to the motherboard is estimated to be problematic.

Whether the parameters are set correctly, after setting the parameters, you should save them and then power them on!

There may be a problem with your operation, please refer to the manual for details.

Is your upper limit and maximum frequency set low?

Correct wiring, no faults, no warning messages, correct setting of parameters, start-up permissive signal, start-up signal, given values.

The condition is that you decide not to drive the drive.

(1) Confirm the motor parameters, and the inverter sets the power, current, voltage, speed, and maximum frequency of the motor in the parameters, and these parameters can be directly obtained from the motor nameplate.

2) The control mode adopted by the inverter, that is, speed control, rotation control, PID control or other methods. After the control mode is adopted, it is generally necessary to carry out static or dynamic identification according to the control accuracy.

3) Set the start mode of the inverter, generally the inverter is set to start from the panel when leaving the factory, the user can choose the start mode according to the actual situation, you can use the panel, external terminals, communication methods and so on.

4) The selection of a given signal, the frequency of the general inverter can also be given in a variety of ways, the panel is given, the external is given, the external voltage or current is given, the communication mode is given, and of course, the frequency of the inverter can also be the sum of one or several ways of these methods. After the above parameters are set correctly, the inverter can basically work normally, if you want to get a better control effect, you can only modify the relevant parameters according to the actual situation.

1. Frequency setting: the panel is active and the external terminal is active.

2. Motor parameters: voltage, frequency, number of poles, rated current, power, etc. These are the most basic, if the inverter works better and better with the motor, the following parameters are also required.

3. V F curve setting, now many inverters can also set the experience curve 4, acceleration time.

5. Lower and upper frequency limits.

There are many specific parameters, which are commonly used, and you need to check the operation manual of the inverter for more specific settings.