Common problems in the use of inverters - Hope Sunland

Create Date: 2024-8-30 12:03:23|Source: Hope Sunland

1. Please clarify the maintenance function of the inverter?

Common problems in the use of inverters - Hope Sunland

(1) After detecting the abnormal situation, take the initiative to correct the action, such as overcurrent loss speed prevention, regeneration overvoltage stall prevention.

(2) After detecting the abnormality, block the PWM control signal of the power semiconductor equipment to make the motor actively park. Such as regenerative overvoltage blocking, overcurrent blocking, semiconductor cooling fan overheating and instantaneous power failure maintenance.

2. What is regenerative braking?

If the motor reduces the command frequency during operation, the motor becomes an asynchronous generator and operates as a brake, which is called regenerative (electrical) braking.

3. Can regenerative braking get more braking force?

The regenerative energy from the motor is stored in the filter capacitors of the inverter. Because of the relationship between capacitor capacity and withstand voltage, the regenerative braking force of the general-purpose inverter is about 10%-20% of the rated torque. If the optional braking unit is selected, it can reach 50%-100%.

4. Why is the inverter stopped during operation when large motors are driven together in the same factory?

When the motor starts, it will flow through the starting current corresponding to the capacity, and the transformer on the stator side of the motor will experience a voltage drop. When the motor capacity is large, this voltage drop will also have a large effect, and the inverter connected to the same transformer will make a judgment of undervoltage or instantaneous stop, so sometimes the maintenance function (IPE) action will cause the operation to be suspended.

5. What is variable frequency resolution? What's the point?

With regard to digitally operated frequency converters, the output frequency is given in stages, even if the frequency command is an analog signal. The smallest unit of this gradient is called the variable resolution. For example, if the resolution is 0.5Hz, then the top of 23Hz can be changed to 23.5 and 24.0 Hz, so the action of the motor is also step-by-step. This poses a problem with regard to the use of things like continuous coiling manipulation. In this case, if the resolution is about 0.015Hz, and the difference between one step of the 4-stage motor is less than 1r/min, it is also possible to get used to it.

More on that

	Control the hovering function operation and principle of the inverter - Sunland inverter How does the hovering function of the inverter work? When the speed of the asynchronous motor is 0, the encoder response is meaningless, and it needs to be converted to V/F control, and the frequency is set to 0; The voltage is set to 0 speed at which the motor promises to withstand the current at the moment ...
	Inverter selection according to capacity matching - Senlan We need to ensure that the capacity of the inverter is matched. First of all, according to the nature of the load, the correct type of inverter is selected. The general principle is what nature of the load characteristics with what characteristics of the inverter. (1) Constant torque production equipment - in the speed regulation range ...
	Selection and capacity matching of inverter - Senlan 1. Select the inverter according to the load characteristics Second, when selecting the inverter, the actual motor current value should be used as the basis for the selection of the inverter, and the extra 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.
	Asynchronous motor with inverter method - Senlan Before the asynchronous motor is equipped with an inverter, let's take a look at the three major types of mechanical equipment loads: 1. Constant torque load: such as conveyor belt and mixer; When the inverter drags the load of constant torque nature, the torque at low speed should be large enough, and the overload should be large enough. If you need ...
	The reason for the humming sound after the motor plus the frequency conversion governor - Senlan The so-called "hum" sound, that is caused by the frequency of the inverter's output waveform carrier, generally if the inverter you use is a fixed carrier, at the moment the motor is screaming, the human ear is more stimulated, then you can adjust the carrier frequency (inverter skills manual function table ...
	The reason for the explosion of the inverter module - Senlan inverter 1. Condensation The temperature difference in the workshop is large, and the inside of the inverter presents condensation. 2. Impact load. The load fluctuates greatly, and the output current of the inverter suddenly increases, resulting in module damage. 3. The inverter is overloaded in the start, ...
	Misunderstanding of the use of inverter - Senlan inverter Poor choice This should be the situation that friends have encountered the most in the Z, the situation of large horse-drawn carts and small horse-drawn carts is everywhere. The big horse-drawn trolley is not bad, at least there is no big problem in use, the most investment has been added, and the equipment can still operate normally; But the small horse-drawn cart ...
	Inverter braking resistance connection method - Senlan inverter If the drive has a built-in braking unit and additional braking resistors, it is important to pay attention to the correct wiring of the braking resistors. The braking resistor should be connected between the P terminal and the DB terminal, but not between the P terminal and the N terminal, otherwise the three-phase rectifier bridge will operate at full load when it is not running, resulting in the equipment can not be ...
	Inverter line control mode - Senlan inverter Each inverter (Variable-frequency Drive, VFD) is subject to different line control, and the methods of voltage control and current control can be divided into two categories, one is voltage type and the other is current type. The control mode can also be divided into voltage control and current type. The main circuit method and ...
	Inverter overcurrent protection solution - Senlan 1. Causes of overcurrent There are many reasons for the occurrence of overcurrent, including soft and hard problems. 1. Causes of soft failures When the acceleration or deceleration time in the inverter parameters is set too short, and the motor power is heavy, it means that in the acceleration, the inverter's ...
	Senlan inverter selection principle 1. Select the inverter according to the load characteristics, such as the load is constant torque load, you can choose Siemens MM440 inverter, ABB ACS800 series inverter, etc.; If the load is a fan or pump load, you can choose Siemens MM430 inverter, ABB ACS510 series inverter, etc. 2、 ...
	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 ...
	The control performance standard of the inverter cabinet The control specifications of the inverter cabinet include reliability, accuracy, safety, environmental habits and versatility, etc., which are important guarantees to ensure the normal operation and safe production of the inverter cabinet control system. Reliability specification: The control system should have high reliability and can be used for a long time.
	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. （ ...
	Senlan low-voltage inverter has four series of applications 1.SB200 fan pump special inverter, widely used in textile, printing and dyeing, washing, cable, packaging, machinery, ceramics, constant pressure water supply, constant temperature control or various OEM. 2.HG1000 high-performance light-load intelligent inverter ...
	Hope for an application example of Sunland inverter Industrial process control: It is expected that Sunland inverters are widely used in industrial process production control, such as conveyors, tugboats, air compressors, pumps, and fans and other equipment in various control systems. Mechanical control: It is expected that Sunland inverters are widely used in mechanical control, such as ...
	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.
	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.
	Senlan inverter multi-stage speed parameter setting The external terminals of the inverter, RH, RM, RL, are speed control terminals. Through the combination of these terminals, three-speed and seven-speed control can be completed. In addition, the other terminals can be redefined, and the fifteen-speed speed can be controlled. ...
	The change of frequency conversion control mode - Senlan In the process of practical speed regulation, a general frequency-adjustable communication power supply can not meet the requirements of speed regulation and control of asynchronous motors, and must also take into account the problems of using the magnetic field of the motor, pressing the starting current and obtaining the desired torque characteristics, such as low-frequency torque characteristics.