Installation and commissioning of coastal enterprises and technology air compressor frequency conversion energy-saving retrofit Liang Yanjuan ms air compressor frequency conversion energy-saving transformation After the transformation plan is formulated and designed, the series installation and commissioning must be carried out according to the design plan. Whether the modified system can operate safely and reliably, the entire installation and commissioning process of the inverter and the load is very important. Reasonable installation and debugging can eliminate equipment defects and eliminate safety hazards. The article makes a preliminary summary of the installation and commissioning of the frequency converter, points out some matters that should be noted and possible problems, and proposes corresponding measures.

Jianjian word air compressor; frequency conversion; installation; commissioning fund project Guangxi Education Department research project number 20095, Guangxi Industrial Vocational and Technical College research fund number Guigong Vocational College research author Liang Yanjuan, Guangxi Industrial Vocational and Technical College, Department of Mechanical Engineering, Lecturer, Research direction Mechanical design and manufacturing, Nanning, Guangxi, air compressor is a kind of equipment that uses electric motor to compress gas in the compression chamber and makes the compressed gas have constant pressure. It is widely used in all aspects of production and life, and is a lot of processes. The core device in the process.

Since the original air compressor of a considerable number of enterprises is still an ordinary air compressor, the motor speed is always maintained at a rated rated speed, and there is no function of automatically adjusting the rotational speed to change the displacement according to the amount of air consumption, and the air compressor In the course of use, the amount of gas used and the amount of exhaust gas often do not match, so that part of the air compressor is in an idle state, and noise is generated, and the working environment becomes bad. This inevitably causes waste of energy and cannot achieve energy saving purposes. In order to reduce the energy consumption and solve the problem of starting the power supply during no-load loading, as long as the fixed capital is invested, the frequency conversion technology transformation of the common air compressor can make the motor realize soft start and soft stop, reduce the starting impact and prolong the use of the equipment. At the same time, due to the variable operating frequency of the motor, the air compressor automatically adjusts the motor speed according to the amount of gas used, which reduces the frequent loading and unloading of the motor, thereby greatly reducing the operating power of the motor and making the air supply system air pressure. Maintain constant, improve the performance of air compressors, improve the quality of gas supply, and achieve the purpose of energy-saving operation, thereby improving the competitiveness of enterprises.

The frequency converter is the most important component of the variable frequency speed control system. After the air compressor is modified by the frequency conversion speed regulation technology, if the installation and debugging are not in place, it will affect the transformation effect, and even can not be used normally. The installation and commissioning steps of the inverter are summarized as follows. Installation of the inverter The requirements of the installation environment for the installation environment The ambient temperature requirements should be controlled between 10 and 40, and the relative humidity of the ambient humidity should be less than 90. Ensure that there is no condensation. In other aspects, the sunlight is not directly irradiated on the inverter. The air is fresh and has less dust, and there is no corrosive gas or flammable gas around. The altitude is 1 meter.

Wall mounted installation. The distance between the inverter and the surrounding objects should be installed in the following conditions. If the installation frequency of a single inverter is less fresh and the environment is cleaner, the cooling method outside the cabinet should be used as much as possible. If the environmental conditions are not met, if the internal cooling method is required, the cooling fan should be installed at the top of the cabinet. Install as much as possible directly above the drive.

Installation of multiple inverters should be installed side by side as much as possible. If it is not possible to install in a longitudinal manner when paralleling, try to install a partition between the two inverters. The drive should be mounted vertically, whether in a side-by-side or longitudinal installation.

The wiring of the inverter must not be connected to the input and output of the inverter. That is, the method of selecting the wire diameter of the power supply and the inverter is the same as the method of selecting the wire diameter of the same capacity motor.

The wiring between the inverter and the motor can not ignore the voltage drop generated by the line to meet the basic requirements of 12, 3 and 1.

The analog control line should be shielded. It should be noted that the shield should be connected to the ground or the earth of the inverter. It can only be connected to the control circuit of the inverter, and the other end can be left floating.

The switch control line can be used without the shield line, but only if the two control lines of the same signal must be twisted together.

If multiple inverters are grounded, each inverter must be connected to the ground one by one. It is not allowed to connect the grounding end of the inverter to the grounding end of another inverter.

Improve the power factor of the inverter to improve the power factor of the inverter. DC reactors and AC reactors are used in the modification, which can suppress the inrush current in the input and weaken the influence caused by the imbalance of the power supply voltage. .

The anti-interference of the inverter is mainly caused by the incoming line of the power supply. In order to effectively suppress the external interference caused by the incoming line, it is possible to try to connect the AC reactor in the input circuit of the inverter.

There are many ways for the inverter to interfere with the outside world, such as the way of radiating air radiated by electromagnetic waves; the electromagnetic induction method induced by the inductance between the lines; the electrostatic induction method induced by the capacitance between the communication lines; and the line propagation propagated through the line source network. Ways, etc.

Input side of the frequency converter. Do not be too far apart between the compressor and the control cabinet during installation. The main wiring must not exceed 30 meters, and the main wiring and the control line should be kept at a fixed distance, and separate wiring is required. The control loop of shielded twisted pair should be used, and the wiring distance should be controlled within 20 meters. In addition, it is necessary to install a ventilation fan inside the control cabinet. The grounding terminal of the inverter cannot be mixed with the power ground, and must be grounded independently and reliably.

Inverter side. Different sources of interference, different anti-interference measures, such as the use of shielded lines and correct wiring to weaken the dry signal generated by the inductive method; use a small inductance in the line to weaken Interference signals generated by line propagation; use of radio anti-interference filters to attenuate interference due to radiation propagation by means of absorption. Note that capacitors are used to absorb harmonic currents. This is absolutely not allowed on the output side of the inverter. . In parallel with the filter reactor between the output side of the inverter and the motor, not only improve the operating characteristics of the motor, but also anti-interference, it is worth promoting.

Instrument side. It can be considered that the power supply isolation method is used to connect the power supply side of the instrument to the isolation transformer and the signal isolation side of the signal side to isolate the anti-interference with the optical coupler.

The commissioning of the frequency converter must be debugged after the installation according to the transformation plan. Through the actual participation in the technical transformation, the extraction and debugging steps are summarized as follows. The use of the function keys on the operation panel is as follows. The inverter has an operation panel, although the brands are different, The function has not changed much. Before commissioning, the on-site commissioning personnel should first familiarize with the functions of the function keys on the operation panel of the inverter and understand the precautions and related checks before power-on. Please read the product technical manual carefully before commissioning. Pay attention to whether there are new contents and precautions; then check whether the input and output of the inverter match the requirements of the technical manual; check whether the connected line is correct and reliable, and never allow reverse or wrong connection; Whether the shielded part of the shielded wire is correctly connected according to the technical manual.

Under the premise that the power-off check determines that the inverter is installed correctly, determine the contents and steps of the inverter power-on check and related debugging. Such as live no-load test; let the motor run at no load; carry out trial operation with load or online adjustment with the host computer.

After the beer is connected to the power supply and try to run at no-load, the AC power is turned on, first press the INFO key to test run, and then to prevent and suppress the interference, it is best to connect a reactor to the TO key to make the inverter run to 50HZ, using 10,000 Use the phase output of the 12-band 13 inverter to measure the phase voltage between 370 and 420; measure the DC bus voltage to keep the bus voltage between 500 and 600. Then press the TOPRESEt stop button. When the frequency drops to 0HZ, connect the motor cable.

Considering the operating current of the inverter, set the number of rated motor rated current and rated speed of the motor.

Select the execution mode of the parameter auto-tuning action. Set the operating mode of the inverter to the built-in keyboard operation mode, press the manual key to run the key and the stop key respectively to observe whether the motor is normally reversed to start or stop; familiar with the protection code of the inverter, pay attention to the thermal protection relay overload protection Factory default setting.

Six whole system debugging Manually operate the function keys of the inverter panel to observe whether the motor and the inverter have abnormal phenomena. If there is an abnormality, change the corresponding predetermined parameters and then re-run. If the inverter has an overcurrent protection action during the start and stop of the motor, the acceleration deceleration time should be reset. If overcurrent occurs during start-up, the acceleration time should be extended appropriately; conversely, if overcurrent occurs during braking, the deceleration time is appropriately extended. In order not to affect production efficiency, the acceleration and deceleration time should not be set too long.

If the inverter still appears to be protected within a limited time, you should try to change the start and stop running curve from the original straight line to the 8-shape, the 1-shaped line or the inverted 8-shaped reverse 1;

If the inverter still has fault operation, such as in the case of sudden changes in speed or load, increasing the current-limited protection value is the preferred method, and at least 5,10 protection margin should be left. The protection must not be cancelled.

In the process of starting the motor driven by the inverter, if the system generates electromechanical resonance, the method of setting the frequency jump value should be adopted to avoid the resonance point, so that the frequency can be automatically skipped when the motor accelerates to ensure the normal operation of the system; If the torque output capability is insufficient, it is necessary to try to increase the torque boost value. If it is not available, the manual torque boost function can be used, but the setting should not be too large to avoid the increase of the motor temperature rise. If the requirements are still not met, the new control method should be used instead. If you use the speed sensorless vector control method, the torque output capability will be larger.

Accurate data exchange. Note: After completing the manual basic settings as follows, if there is a host computer in the system, the control line of the inverter should be directly connected to the control line of the host computer. The operation mode of the inverter is changed to be given by the running command of the host computer.

When the inverter and the host computer are online debugging, if the host computer gives the control signal, the inverter does not execute or does not receive the command, or the inverter can execute the command but there is error or inaccuracy, and an additional 24 DC relay should be added to output a switch. The signal to the main control board terminal of the inverter not only improves the anti-interference ability of the inverter, but also checks whether the support protocol and interface mode of the inverter are correct.

In short, after the function setting of the inverter and the no-load operation are completed, the linkage debugging of the entire system can be performed. The main steps of debugging are as follows: the inverter is connected to the system according to the frequency conversion transformation plan; 0, let the whole system first carry out the power frequency control operation; 3 then let the whole system perform the frequency conversion control operation. Open-loop debugging mainly observes the increase of the frequency of the inverter, and whether the air compressor is shut down normally. If it is normal, the closed loop can be debugged. The closed-loop debugging mainly adjusts the frequency rise and fall force oscillation of the inverter, and pays attention to observe and jumps the frequency near the resonance point.

The above is the basic process of installation and commissioning of the inverter. The system after frequency conversion transformation can operate safely and reliably, the inverter and the technical manual of the loaded product, carefully check the structure of the inverter and check the characteristics of the inverter, and then follow the above steps to debug step by step.

By participating in the air compressor frequency conversion transformation, we have the opportunity to participate in the installation and commissioning of the inverter. I found that only in strict accordance with the technical specifications of the inverter, correctly install and take various effective measures in a targeted manner, pay attention to the mutual matching of the whole system, correct Perform parameter setting and debugging. Pay attention to the continuous correction of the inverter parameters as the environment and load conditions change, in order to ensure the maximum function of the inverter and share the benefits of the new technology.

1 Cao Yu, Li Happiness. Installation and commissioning of the inverter. Coal Engineering, 2008, 1.

Kong Jun. Talking about the installation and debugging methods of the inverter. Newsletter, 2, 9.

Teng Feng, Zhang Chunling. Basic steps for commissioning the drive. Equipment management and maintenance of the system and the upper computer to ensure the integrity of the control system. In many cases, the inverter needs to be fast with the host computer control system, the text display, the human-machine interface, the controller, the touch screen, the human-machine interface, etc.

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