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Of course, the rectifier bridge will go through the power-off test at first) and then go through the inverter circuit to control the on-off of the inverter circuit to output the voltage of the appropriate frequency we want (the main thing that the inverter can convert frequency is to control the off of the inverter circuit to control the output frequency). There are numerous kinds of inverter faults, but now the inverter tends to be intelligent, and general faults can be detected by itself Test, and display its code on the control panel, the user only needs to check the user manual to preliminarily determine the cause of its failure.
But sometimes, when the frequency converter is running or starting or loading, suddenly the indicator light is not on, the fan does not turn, and there is no output. At this time, we beginners don't know what to do. In fact, it's very simple. We just need to turn off the power supply of the inverter. Power off test its rectifier part and inverter part. In most cases, you can know the fault.
Here's one thing to note:
After power failure, it can't be measured immediately, because there is a large capacitance in the frequency converter with hundreds of volts of high voltage, it must wait for more than ten minutes to measure!
? test of rectifier bridge and inverter circuit before power on of frequency converter
The specific measurement method is as follows:
Find "+" and "-" of the DC output terminal of the converter, adjust the multimeter to the measurement diode, connect the black probe with "+" probe to the input terminals L1, L2 and L3 of the converter respectively, if the upper half of the rectifier bridge is intact, the multimeter shall display 0.3 If it is damaged, the multimeter will display "1" over range.
On the contrary, connect the red lead and the black lead to L1, L2 and L3 respectively. The same result above shall be obtained. If "1" appears, it indicates that the rectifier bridge is damaged. Then test the inverter circuit, the method is as follows: adjust the multimeter to the resistance × 10, connect the black probe with "+" red probe to the output terminal u, V, w of the converter, which should have a resistance value of tens of ohms, and the reverse should be infinite. On the contrary, if you repeat the above process, you should get the same result.
In this way, when judging whether the rectifier part and inverter part of the converter are in good condition through measurement, power on and measure the DC output terminal to see if there is about 530v high voltage. Note that sometimes the multimeter shows dozens of volts. We think the rectifier circuit is working, but it is not working. It will output about 530v high voltage when it is working normally, and dozens of volts are induced from the inside of the converter. If there is no high voltage around 530v, it is often a problem with the power version.
Some frequency converters are due to the burning of a small chip resistance of the power version, which causes the power board to not work, so that the frequency converter has no display and output, the fan does not turn, and the indicator light does not light up. In this way, we can initially determine which part of the frequency converter has a fault, and then we can focus on testing the suspected part of the fault when disassembling the machine for maintenance.
2¡¢ Technical basis
1. Electronic line shafting --- els, many industrial production lines are composed of multiple machines, and each axis has motion relationship. In the past, mechanical mechanisms were used to connect the shafts. If the shafts were connected electronically, each state had its own driving motor, it was called "electronic line shifting" (ELS).
2. Auto tuning is a technology commonly used in magnetic beam vector converter. It can automatically monitor (find) motor parameters, such as slip frequency / field current / torque current / stator impedance / rotor impedance / stator reactance / rotor reactance, etc. only with these parameters can we make [Special estimation] and [slip (slip) compensation]. Because of this technology, it can still be obtained without encoder Good running accuracy
3. In the speed control, compared with the open-loop of the old variable frequency converter, the closed-loop is achieved by the speed observation and calculation function in the magnetic beam vector converter. The motor side can achieve good speed accuracy without encoder. The operation without encoder has the following advantages:
1) , fine wiring;
2) , do not worry about the influence of RF noise on the low voltage signal of the encoder;
 
3) In the case of multi vibration, there is no need to worry about the high failure rate of the encoder.
 
 
 
4. In vector control of frequency converter, in AC motor, the rotor generates magnetic field by induced current of stator winding. Stator current includes two parts: one part influences magnetic field, the other part influences motor output torque. In order to use AC motor in the situation of speed and torque control, it is necessary to be able to separate the current that affects torque, and the magnetic beam vector control can separate the two parts independently Control. (the physical quantities with size and direction are called vectors).
 
 
 
5. The field peaking field peaking circuit can be used to weaken the field current of the motor, change the balance relationship with the magnetic field, and make the motor run at a speed higher than the basic speed.
 
 
 
6. Constant torque application, where the required torque does not change due to speed, is often used to [constant torque application]. For example, load such as conveyor belt. [constant torque application] usually requires a large starting torque. [constant torque application] is easy to have motor heating problem when running at low speed. Solution:
 
 
 
(1) Increase motor power;
 
 
 
(2) Use the inverter special motor equipped with constant speed cooling (that is, the cooling mode of the motor is forced air cooling).
 
 
 
7. Variable torque applications are commonly found in centrifugal loads, such as pumps / fans / fans, etc., whose purpose is generally to save energy
 
 
 
For example, when the fan is running at 50% speed, the required torque is less than that required for full speed operation. The variable torque converter can only give the required torque to the motor, achieving energy saving effect. Secondary application
 


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