1, inverter circuit board can be used normally with a hot fan. What is the reason?
Answer: There may be several reasons for this situation:
(1) The circuit board is falsely soldered or desoldered, and there will be tin spots for a while. In this case, it will be fine to solder
(2) The electrolytic capacitor has leakage
(3) The thermal stability of the IC chip is poor, and the possibility of this situation is relatively small.
2, Schneider ATV-61 inverter does not have a start stop button. Can this inverter be started with a button?
Answer: The Schneider ATV61 panel has rise and fall keys, which can be used to adjust the frequency, and cannot be used to start and customize the inverter. If you need to start and stop, you need to purchase a Chinese panel. There is a mesh port on the inverter panel to connect to the Chinese panel.
3. Huichuan MD280 5.5KW inverter often shows overcurrent quickly when transmitting power. Is there any problem with the circuit checking?
Answer: The inverter usually overcurrent only after starting up, and there will generally be no overcurrent when powered on. After power is sent, overcurrent is reported. You need to consider whether it is a legacy fault. You can press the reset function key to reset it.
4. How to maintain the board of the inverter? Do I need to apply three-proof paint?
Answer: Depending on where the inverter is used, the inverter generally does not brush three-proof paint. Many inverters have glue when they leave the factory. Assuming that the environment is relatively humidity and dust is relatively high, you can brush a layer of glue and bake it dry after brushing. Generally speaking, if you can brush the three-proof paint without brushing, you will not brush it unless the working environment before the inverter is very harsh and will only brush it after repair.
5. Is it possible to ask the Leifeng 37KW inverter, press the start button and the frequency rises to the highest, but the measured current is only more than ten amperes. What is the situation? Is the inverter normal?
Answer: First of all, the current you measure is the input current or the output current. If it is the current at the input terminal, then it is normal for more than ten amperes, because the motor is not fully loaded, and the current at the input terminal of the inverter is much smaller than the output terminal. If the output is measured, the current should be 74A for a 37KW motor, and the normal working no-load current should be at least about 20A.
6. Will the inverter explode the capacitor after a long-term two-phase operation?
Answer: If the three-phase input inverter is inputting two phases, will the inverter generally not explode the capacitor? At most, it will explode the rectifier module. If it is outputting the two-phase inverter, it will report a phase-lost fault.
7. Can a 380V inverter be used to start a three-phase 220V motor with the same power?
Answer: It's totally OK, just adjust the parameters. You only need to adjust the voltage parameters of the motor from 380V to 220, and also adjust the maximum output voltage of the inverter to the maximum output 220V.
8. Is there any leakage in the motor operation, which parameters need to be debugged?
Answer: The inverter has no motor leakage parameters. The motor grounding inverter can be detected. There are no debugging parameters. Some inverters have grounding current parameters, but some do not. Look for all parameters in the inverter and look for all parameters to see if there is this grounding current alarm value.
9. The inverter is normal before the power outage, and there is no running signal, but what is the reason for the overcurrent?
should have a problem with transformer . Assuming that the inverter is powered up, it will be overcurrent. One of the three transformers has the highest output current, and it will be overcurrent. Check the transformer
10 and Weiken inverter NX0001VU73, and the error alarm code 13 is there. Check the manual for the low temperature alarm, and the low alarm is 40 degrees. The current ambient temperature is two degrees Celsius. How should it be handled?
Answer: The temperature sensor inside may be faulty. The temperature sensor is on the heat sink. It is recommended to check the temperature on the inverter first.All brands of inverters will adjust parameters through the panel, and display the temperature of the inverter's base plate on the panel. Look at the temperature of the base plate. Assuming that the on-site temperature is only two degrees, but my base plate temperature is only ten degrees negative, then either the temperature sensor is broken or the temperature sensor is poor linear. If the base plate temperature is two degrees, it may be that the parameter setting is wrong, because some inverters can adjust the temperature alarm parameters.
11. What are the parameters that Delta VFD-B inverter has a power of 2.2KW. What are the parameters that need to be set to connect to a 750W motor?
Answer: You need to set the pole number of the motor, the motor voltage, the motor capacity, and the percentage of the rated current of the inverter. Because the current set by Delta inverter is very unintuitive, it is calculated proportionally, and there is a minimum current and a maximum limit current in the parameters. Generally, the current of 750W motor is less than 2A.
12. Will the module explode when the inverter input end enters the lamp trolley?
Answer: Not necessarily. The inverter input string light bulb is just for charging. There is a P+ (DC bus positive pole) on the other side of the module. The power supply string of the module positive pole is placed on the DC bus, ensuring that it cannot be exploded. Generally speaking, for example, repairing ABB's large inverter, two light bulbs are connected to the positive electrode of the IGBT module and the DC bus, and to the positive electrodes at both ends of the rectified capacitor. That is to say, these two light bulbs are connected to the IGBT to ensure that the module will not explode. If you charge the large capacitor first, after charging, the module is short-circuited and the large capacitor is discharged, it will definitely explode.
Therefore, generally, if there is a problem with the trigger board, disconnect the positive electrode of the IGBT DC bus, charge the capacitor, and after the capacitor is charged, send the electricity to the IGBT, and connect two light bulbs in series between the capacitor and the positive electrode of the DC bus. Generally, when we repair high-power inverters, we will have two large light bulbs or resistor wires. If there is a problem with the electric furnace, if there is a problem with the driving and the trigger circuit, the IGBT will not explode, and at most the electric furnace will become red.
13. The output voltage of the Siemens inverter is balanced, but the output current is unbalanced. Just replace the inverter. What is the reason?
Answer: Because the inverter has current compensation, the current detection circuit inside the inverter may be faulty.
14. The inverter output of Siemens 430 reactor has a high temperature, 105 degrees. Is it a problem with the reactor?
Answer: It is generally normal to be around 60 degrees. There may be two reasons for this situation: First, the carrier frequency is set too high, the inverter carrier frequency output is adjusted too high, the inverter output torque is increased too much, and the inverter output current is too large to connect to the motor, which will lead to high reactor. Second, is the output current too large.
15. What are the main reasons for the IGBT breakdown of the inverter?
Answer: Check whether the motor is connected incorrectly or the input and output is connected incorrectly, and it also depends on whether it is a new frequency converter. Assuming it is an old frequency converter, the IGBT is prone to failure, and the IGBT used is of average quality, and it is normal that it has not broken for one to two years.
16. Is the reason why the ABB800 inverter often fails in conversion? Is there any problem with the inverter itself?
Answer: First of all, see if the inverter is new or old. If it is a new inverter, check whether the motor parameter settings are not set well or the torque failure is set too large. If it is, it may be that there is a problem with the IGBT module or circuit board, and further inspection is needed.
17. May I ask if the 5.5kW inverter starts with heavy load, the speed is not rotated, and the hand needs to push it before turning. Which parameters should be set?
Answer: Increase the output torque of the inverter. Any inverter has this parameter. For details, check the instructions of the corresponding inverter you are using.
18. How should the inverter overcurrent be adjusted?
Answer: There are many types of frequency converter overcurrent reporting. Some are overcurrent reporting when accelerating, some are overcurrent reporting when accelerating, some are overcurrent reporting when accelerating, and some are overcurrent reporting when accelerating, and some are overcurrent reporting when accelerating overcurrent. The reason for the motor or the reason for the inverter is to be checked.Assuming that the inverter is powered on, the voltage of the output pin of the current transformer may be particularly high, so the output pin voltage of the current transformer is particularly high, so the inverter is powered on, which has exceeded the range that the inverter can correct. Assuming that the inverter is closed, the overcurrent will be reported immediately. There are two reasons here. One is the IGBT and the other is the three current transformers of the inverter. There is a group of voltages that are particularly high. This is the overcurrent when powered on. There is also a press to run, and it can go to 3Hz~5Hz, and then overcurrent is reported. It may be a problem with parameter setting. When the parameter is set, is the output torque too small, the motor current setting is inaccurate, the maximum frequency setting is inaccurate, the motor voltage setting is inaccurate, and the motor voltage setting is inaccurate
19, what is the situation when VLT2800 buying a new memory chip and replacing it with no use?
Answer: It is definitely useless to buy a memory chip and install it, because it is blank inside and there must be original information there to be placed there for the chip. In addition, it depends on the serial number of the inverter. The serial number represents its version, and the version of the inverter is also different. Note that the memory chip of motherboard cannot be replaced randomly. It is necessary to provide a database, and there must be a certain method.
20. When the inverter is in V/F mode, should you learn motor parameters by yourself? What is the difference between studying and not studying?
Answer: It depends on what brand of inverter it is. Some brands of inverter learning in V/F mode has little effect. Inverter V/F constant torque speed regulation. Generally speaking, in V/F mode, you can learn by yourself or without self-learning, but it is recommended to learn by yourself. But in FOC mode, you must learn by yourself. After the frequency converter is self-learning, the output torque at low frequencies will be greatly supplemented. Low-frequency motors will not have enough torque if they do not study by themselves.
21, Emerson DC speed regulator MP550A4, alarm HF04, data processing error, power processor has no communication, but it is normal after changing the motherboard. What is the problem?
Answer: Data processing errors should be a problem with the motherboard database. Emerson CT motherboard has a digital tube on it. It depends on whether this type of motherboard is the one that has broken database. You can change it to another database.
22. What is the problem with the E6 error of Mitsubishi F700? The instruction manual says CPU communication exception.
Answer: Check if the panel crystal head is dirty, resulting in poor contact. Remove the panel, scrape the crystal head, and scrape the mesh hole. If it is a CPU communication abnormality, E7 should be reported, not E6, E6 is not a communication abnormality, E7 is a problem with the motherboard connecting the bottom plate.
23. The inverter with load cannot be rotated occasionally, and the frequency cannot be increased by around 7Hz. What is the problem?
Answer: The possible reason why the inverter cannot rotate occasionally with load is that the output torque is too low. The inverter gives it 50Hz, but it can't get up after only running to 7Hz. This proves that it is overloaded, the motor is overloaded, or the torque output is too small, resulting in the frequency not being raised. In addition, it may be that the motor parameters are not set properly. Check whether the motor parameters are set accurately.
(Original by Xiaoqi, electrician, may not be reproduced without authorization, violators will be prosecuted!)
