The types of production machinery are complex, the functional and process requirements are different, and the torque characteristics are also different, therefore, before the application of the inverter, the first thing is to understand the nature of the load carried by the motor, that is, the load characteristics, and then select the inverter and the motor. There are three types of loads: constant torque loads, fan pump loads, and constant power loads. Different types of inverters should be selected for different types of loads.
(1) Constant torque load: It can be divided into collision load and potential load. The starting torque of conflict clothing generally requires about 150% of the additional torque, and the braking torque generally requires about 100% of the additional torque. The potential energy load generally requires a large starting torque and energy feedback function, which can quickly realize forward and reverse rotation, and the inverter should choose an inverter with four-quadrant operation ability.
(2) Fan pump load: The negative pump wind load is a typical square torque load, the load is very small at low speed, and it is proportional to the square of the speed, and the combination of general inverter and standard motor is suitable. This kind of load does not have high requirements for the function of the inverter, only requires economy and reliability, so it is necessary to select the inverter with U/f=const control form.
(3) Constant power load: Constant power load refers to a load where the torque is inversely proportional to the speed, but the power is stable, such as coilers, machine tools, etc. A little bit of the inverter should be paid attention to in the clothing with constant power characteristics: the output voltage of the inverter in the frequency range above the power frequency is controlled at a fixed value, so the torque and load torque of the motor have opposite tendencies, and it is difficult to get used to the combination of the motor and the general inverter, so it is necessary to plan it specially.
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Introduction to the classification method of inverter maintenance faults
1. How to distinguish between heavy faults and light faults
According to the occurrence time of inverter faults, we can divide the types of faults into two categories: sudden faults and intermittent faults:
(1) The sudden fault of inverter repair refers to the failure of the equipment when it is running, without warning.
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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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Inverter overcurrent treatment method - Senlan inverter
Overcurrent or overload of the inverter is a common problem of the inverter, and overcurrent refers to the value of the current flowing through the inverter beyond its additional range.
1. If the power supply of the inverter is out of phase, the circuit at the output end is disconnected or the motor winding ...
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Inverter interference solution - Sunland inverter
1. Make proper grounding
After a detailed investigation of the site, we can see that the grounding situation on the site is not very ambitious. The correct grounding can not only be useful for the system to press the external disturbance, but also to reduce the disturbance of the equipment itself to the outside world, which is the most useful for dealing with the disturbance of the inverter.
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Common problems in the use of inverters - Hope Sunland
1. Please clarify the maintenance function of the inverter?
(1) After detecting the abnormal situation, take the initiative to correct the action, such as overcurrent loss speed prevention, regeneration overvoltage stall prevention.
(2) Block the power semiconductors after detecting the abnormality...
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Senlan SV1000 servo drive wearing parts replacement
The wearing parts of the driver mainly include electrolytic capacitors for filtering and cooling fans, and their service life is closely related to the environment and maintenance of the operation.
Depending on the operating moment, the user can determine whether a wear part needs to be replaced.
Cooling ...
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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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Servo motor regular diagnosis and repair method - Senlan
1. Common faults of motor heating up too high or smoke motor
Causes: 1. Excessive load; 2. Two-phase operation; 3. Blocked air duct; 4. The working temperature is too high; 5. Interphase or inter-turn short circuit fault of motor stator winding; 6. Motor stator winding grounding device; 7. The power supply voltage is too high or too low;
Overhaul...
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The connection method of the shielded wire adheres to the principle - Senlan inverter
1. The shield wire should be as close as possible to the low potential end, which can be understood in this way, generally we think that the ground potential is "0", and in reality, if there are two grounding terminals, there will be a potential difference between the two grounding terminals at a certain time, and there will be a current between the two wires, which is also a kind of agitation.
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The inverter controls the speed of the AC motor - Senland
The rotational speed of an induction AC motor (henceforth referred to as a motor) is approximately determined by the number of poles and frequency of the motor. The number of poles of the motor is fixed by the operating principle of the motor. Since the number of poles is not a successive value (a multiple of 2, e.g. 2,4,6), ...
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Inverter with no-load operation and debugging - Hope Sunland
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 check the operating current of the inverter.
（ ...
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Limit switch wiring method - hope Senlan
Limit switch is an electromechanical control element used to detect the direction of the movement of the machine or equipment, and send a signal when the specific position is in a specific direction to control the operation or stop of the equipment. It is often used in industrial production processes, such as CNC machine tools, conveyors, loading and unloading robots, etc.
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Motor encoder and rotor pole phase zero alignment repair - Sunland
1. Phase alignment method of incremental encoder
The alignment between the phase of the UVW electronic transmutation signal and the phase of the rotor pole, or the phase of the TV spot, of the incremental encoder with the signal exchange is as follows:
1) Use a DC power supply to pass the UV winding of the motor to less than the amount of ...
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PLC and inverter connection control method - Senlan inverter
There are three connection control methods between PLC and inverter:
1. Use the analog output module of PLC to control the analog output module of the inverter The analog output module of the PLC outputs 0-5V voltage signal or 4-20mA current signal, which is used as the analog of the inverter.
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Precautions for using inverter - Sunland inverter
A frequency converter (VFD) is an electrical energy control device that converts a power supply to another frequency by using the on-off effect of power semiconductor equipment. It can realize the soft start, frequency conversion speed regulation, improved operation accuracy, power factor, overcurrent/overvoltage/overload protection of AC asynchronous motor, etc.
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Get to know the capacitor of the inverter - Sunland inverter
1. The capacitance is generally indicated by "C" plus a number in the circuit (e.g., C25 indicates the capacitance numbered 25).
A capacitor is a component composed of two metal films close to each other and separated by an insulating material in the center. The characteristic of the capacitor is first and foremost the communication through the DC block. The size of the capacitance is ...
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Characteristics of two-phase electric fan inverter - Sunland inverter
The digital signal processor is selected, and the work efficiency is higher
A good quality two-phase electric fan inverter uses a digital signal processor, which can make the work efficiency higher, that is, it may take 3 hours to complete the work, but now it only takes 2 hours to be able to...
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Senlan frequency conversion cabinet wiring steps
The wiring of the inverter cabinet refers to the correct connection between the inverter and the motor, power supply and other equipment. The wiring requirements of the cabinet are carried out in accordance with the electrical principles and equipment specifications to ensure the normal operation and safety of the system.
The following is the cabinet ...
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Precautions for inverter selection and capacity matching - Senlan
1. Select the inverter according to the load characteristics
Second, when selecting the inverter, the current value of the practical motor should be used as the basis for the selection of the inverter, and the rated power of the motor can only be used as a reference. Secondly, it should be fully considered that the output of the inverter contains higher harmonics, which will form the power factor of the motor.
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Excessive capacity of the inverter causes harm to electrical equipment - Senlan inverter
(1) The harmonic current generated will directly cause the additional heating of the motor, so that the stator of the motor surpasses the additional temperature rise of the motor itself, so that the additional output capacity of the motor will be greatly reduced.
(2) The current output of the inverter ...
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