In order to ensure the safe, efficient and reliable operation of the inverter, the following keys should be grasped when using the inverter:
1) It is necessary to reliably ground the grounding terminal of the inverter to effectively press the radio frequency disturbance and enhance the reliability of the system: the frequency conversion speed regulation system is best to use independent grounding, and the grounding resistance is less than 1Ω. The grounding wires such as sensors, I/O interfaces, and shields in the frequency conversion speed regulation system should be independently connected with the grounding busbar of the system.
2) The ambient temperature has a great impact on the service life of the inverter, and the life of the inverter is halved for every 10 °C of the ambient temperature, so the ambient temperature and heat dissipation around the inverter must be dealt with. In order to ensure the safe and reliable operation of the inverter, the inverter should be placed in an air-conditioned environment, the temperature should be controlled at 25 °C±3 °C, and the relative humidity RH should be ≤ 70%-75%. Practice has proved that the failure rate of the inverter in the air-conditioned environment is much less than that in the air-conditioned environment, and the reliability of the system has also been strengthened.
3) Correct wiring and parameter setting. Before installing the inverter, it is necessary to read its manual carefully to grasp its usage, precautions and wiring; After the inverter is installed according to the technical conditions required by the inverter device, the parameters are correctly set according to the application requirements. It is not advisable to install a communication contactor between the inverter and the driven motor to prevent overvoltage from damaging the inverter at the moment of contactor breaking. The output of the inverter cannot be equipped with a capacitance compensation device to prevent the capacitor from being damaged by overheating caused by higher harmonics and the malfunction of the inverter's overcurrent maintenance.
4) The operation and abort of the inverter can not be operated directly by the circuit breaker and contactor, but should be operated by the inverter control terminal or the inverter panel keyboard, otherwise the inverter will be out of control, and the inverter may be damaged.
5) Prevent the use of inverter to drive the motor that does not match its capacity, the small capacity of the motor will affect the output of the torque, and the harmonic weight of the current will increase if the capacity is too large, which will have a negative impact on the frequency conversion speed regulation system. When using one inverter to drive multiple motors, in addition to making the total current of the motor operation less than the rated current of the inverter, it is necessary to consider at least the influence of the starting current of the maximum motor to prevent the overcurrent maintenance action of the inverter. When the driven motor is equipped with a brake, the inverter shall operate in the free shutdown mode, and the action signal of the brake shall be announced only after the inverter parking instruction is announced.
6) The selection of the motor and its best operation section is a key consideration in the planning, if the inverter long-term operation is below 5Hz, the motor heating will become an outstanding problem. When the motor is operated at low speed with the inverter, due to the decrease in the cooling effect of the motor, the temperature rise of the motor is too high, which is not conducive to the safe operation of the motor, it is necessary to ensure that the motor has good ventilation conditions, and if necessary, external ventilation and cooling measures are adopted, and the motor should be prevented from operating in the low-frequency area for a long time in the planning.
7) The inverter can arbitrarily adjust the speed of the motor, which brings convenience to the adjustment, but each motor has its certain natural frequency, if the speed frequency of the motor is just satisfactory to the production requirements, but just close to the natural frequency of the motor, resonance will occur, bringing serious damage to the motor, therefore. On the premise of satisfying the production requirements, it is necessary to consider avoiding the critical speed of the motor as much as possible.
8) Under the premise of conforming to the planning specifications, the length of the cable between the inverter and the motor should be shortened as much as possible to reduce the distributed capacitance of the cable between the inverter and the motor, so as to reduce the parasitic current during the low-frequency operation of the inverter.
9) It is strictly forbidden to directly measure the insulation resistance of the inverter with the insulation resistance meter, and it is necessary to disconnect the inverter and all weak current components when carrying out the insulation shake test, these components cannot be shaken by the insulation resistance meter, and the inverter should not be tested for withstand voltage.
10) If the frequency conversion speed regulation system adopts the power frequency and frequency conversion switching mode, the interlock between the power frequency output and the frequency conversion output should be reliable. Moreover, when switching between power frequency and frequency conversion, the output of the inverter should be blocked before the contactor is operated. Since it takes a certain amount of time for the contact adhesion and the arc of the high-capacity contactor to be calmed, it is necessary to cooperate optimally in the sequence and time of switching.
11) Installing an electromagnetic disturbance filter at the input end of the inverter can be useful to press the conduction disturbance of the inverter to the power grid, and installing a communication reactor at the input end of the inverter and a DC reactor on the DC bus of the inverter can improve the power factor, reduce harmonic pollution, and have a good induction effect. In the case of a distance of more than 100 m between the motor and the inverter, it is necessary to install a communication output reactor at the output end of the inverter to deal with the leakage current caused by the distribution parameters of the output wire to the ground, so as to reduce the radiation disturbance to the outside.
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The manufacturing standard of Sunland inverter cabinet
Planning specifications: The planning of inverter cabinets should conform to relevant national norms and industry norms, such as GB/T15576-2018 "Low-voltage Distribution Cabinet", GB7251.1-2017 "Low-voltage Complete Switchgear and Control Equipment", etc.
Material specifications: The materials of the control cabinet should conform to the relevant codes and regulations.
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Wiring specification of inverter control cabinet - Senland
The signal line and the power line must be routed separately: when using the analog signal to remotely control the inverter, the signal line of the control inverter and the strong current circuit (main circuit and sequential control circuit) can be separated from the inverter and other equipment to the analog interference, and the interval should be more than 30cm. Signal ...
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Practical installation precautions for frequency converters
When the line power supply exceeds the driver's kV-A rating by 10 times, add a line reactor.
A 3% impedance line reactor should be used to reduce power line transient voltages caused by capacitor switching, line notching, DC bus overvoltage tripping, and inverter overcurrent and overvoltage conditions. Line...
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The difference between a voltage signal and a current signal
The general voltage in industry is 0... 5(10)V or current 0(4)... 20mA is used as an analog signal transmission method, and it is also a method often used by program control machines. So what is the difference between the transmission method of voltage and current, and when to choose what method, the following will be briefly introduced.
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The reason for using frequency conversion speed regulation - Senlan
Now, the frequency conversion speed regulation system has been widely used in the industrial production of various small and medium-sized enterprises. This is all due to our ability to provide accurate speed control and complete stepless speed regulation. Therefore, it can easily control the ascent and descent of mechanical transmissions, traverse ...
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Attention to the shortcomings of the inverter - hope Senlan
The wiring interval between the motor and the inverter is too long, causing the new motor to catch fire
Burn two new motors in a row! The output current and voltage of the inverter are balanced, the input voltage is balanced, the current is unstable, the fluctuation is 20%-50%, the inverter is burned off by a short circuit between 35Hz turns, the grid voltage is very stable, 720V, ...
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Inverter parameter setting method - Senlan
1. Control method:
i.e. speed control, rotation control, PID control, or other methods. After the control method is adopted, it is generally necessary to carry out static or dynamic identification according to the control accuracy.
2. Minimum operating frequency:
That is, the minimum speed of the motor operation, the motor at low speed ...
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Senlan identifies the fault place of the inverter
How to distinguish where the inverter is wrong?
Step 1: Static data checking
1. Check the inverter circuit
The red watch rod is received to the P end, and the black watch rod is separated from U, V, and W, and there should be a resistance value of tens of ohms, and the resistance value base of each phase, the same, the opposite should be infinite.
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Overvoltage treatment method caused by load input side - Senland
(1). The deceleration time of the frequency conversion parameter is increased or free parking is adopted
Assuming that the overpressure phenomenon is present in the parking process, the process has no parking requirements for the parking time or direction, and the deceleration time can be increased appropriately. The reason for the overvoltage in the parking process is that after the frequency conversion announces the deceleration command, the motor ...
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How to carry out electrical system commissioning quota? ——Sunland inverter
The commissioning of the electrical system refers to the commissioning of the entire high and low voltage system. The power supply commissioning of civil electrical projects such as general residences, schools, office buildings, hotels, and shops shall be carried out in accordance with the following provisions:
(1) About the commissioning of the belt in the distribution room ...
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How to choose an inverter - Hope Sunland
The selection of the inverter should be considered according to the type of controlled object, speed regulation scale, static speed accuracy, starting torque, etc., so that it can be easy to use and economical together with meeting the process and production requirements. According to the different forms of devices, it can be divided into four types, which can be divided into four types according to the controlled motor power and field device ...
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Heat dissipation method of small-capacity inverter - Senlan
Natural heat dissipation methods are generally used for heat dissipation of small-capacity inverters, because their operating environment should be well ventilated and free of dust and floating objects. The dragging objects of this type of inverter are mostly household air conditioners, CNC machine tools, etc., and the power is small.
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Sunland inverter does not show fault repair
After inspection, the circuit board of the machine is composed of a fan switching power supply board, a control board with a switching power supply and a driving board, etc., the fan power supply and the control board operation power supply are independent of each other, the fan power supply output is normal, and the control board operation power supply is not output due to the problem.
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Inverter with no-load operation debugging steps - Sunland inverter
The following four steps are very important for the commissioning of the inverter with the machine (i.e., connected to the motor) and no-load (i.e., the motor without load).
(1) Set the power of the motor, the number of pole pairs, and determine the working current of the inverter.
（ ...
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Solve the inverter fault method - Sunland inverter
Motherboard faults are often manifested as faults that are difficult to visually identify, such as system startup failure and screen invisibility.
You can use a brush to gently brush off the dust on the motherboard, in addition, some plug-in cards and chips on the motherboard are in the form of plugs.
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At the physical level, the stable operation of the inverter is guaranteed-Senlan inverter
For the most popular electrical control equipment inverter (Variable-frequency Drive, VFD), as a precision electronic industrial control equipment, in order to run smoothly for a long time, we, as professional and technical personnel, need to be on the VFD device or before the operation.
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General technical specifications for Sunland inverter SB200 series
Input rated voltage, frequency 3 phase: 380V, 50/60Hz allowable scale Voltage: 320-420V;
Voltage unbalance: <3%;
Frequency: 47 - 63 Hz Output output voltage 3 phases, 0V - input voltage, error less than 5% Output frequency scale ...
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Inverter protection and braking force issues – Sunland
1. What is regenerative braking?
If the motor decreases the command frequency during operation, the motor becomes an asynchronous generator and works as a brake, which is called regenerative (electrical) braking.
2. Can you get more braking power?
Regenerated from the motor ...
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Fault signal processing method of frequency converter
(1) Check whether the motor is hot.
If the temperature rise of the motor is not high, you should first check whether the size of the load, the acceleration and deceleration time, and the running cycle time are reasonable, and correct the V/F characteristics, and check whether the electronic thermal protection function of the inverter is preset reasonably, such as the inverter.
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Inverter water inlet maintenance method - Sunland inverter
The first step is not to turn on electricity! First open the inverter panel, wipe the inverter dry, and then use a hair dryer to dry the display, PC board, push board, power components, fans, etc., with 95% alcohol, scrub the components with 95% alcohol, and dry the hair dryer with cold air.
Step 2: After an hour, use alcohol ...
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