Frequency Converter Common Faults And Maintenance Strategy - Frequency Converter, Frequency Control

VVVF Technology Is an important development of modern electric drive technology direction

, with the power electronics technology, microelectronic technology and modern control theory in the application of AC drive system, variable frequency AC speed has gradually replaced the previous slip speed, variable speed control pole the DC speed control speed control system, more and more widely applied in industrial production and many areas of daily life. As a result of use of the environment, life and human operation using some factor, significantly reduced the frequency converter life, At the same time there have been in use all kinds of trouble. We

following some common faults and inverter measures and we do a study:

First of all we can do a static test converter, universal converter generally less include the following components: a rectifier circuit, 2 DC intermediate circuit, inverter circuit 3, and 4 control circuit. Static test key is rectifier circuits, DC intermediate circuit and part of the power inverter circuit transistor (power module) of a test, this equipment is Multimeter . Rectifier circuit main rectifier diodes is a positive and negative phase of testing to determine its good and bad, of course, we can also use the table to test pressure. DC intermediate circuit is the main filter capacitor capacity and pressure measurement, We can also observe the capacitance of the safety valve is burst open any leakage phenomena to determine its good and bad. The quality of the power module is to determine the main power module inside the freewheeling diodes of the judge. IGBT module for our need to judge where the case could trigger voltage turn on and off.

Second, we can judge by the frequency converter shows where the point of failure.

1.OC. over-current, this may be the most common inverter which has broken down. We must first rule out the parameters of the problem as a result of the failure. For example, current limit, acceleration time is too short can cause over-current generation. Then we must determine whether the current detection circuit a problem. To FVR075G7S-4EX example: we sometimes see FVR075G7S-4EX motor running in no time then there will be current display panel. Current from where? Then it is necessary to test the three Hall Sensor In order to determine which phase Sensor Damage we can split a phase sensor each time once a plane to see if there will be current shows, after this test can basically rule out the OC fault.

2.OV. over-voltage, we must first rule out the parameters of the problem as a result of the failure. For example, deceleration time is too short, and as a result of regeneration of load over-voltage, etc., then we can look at the input side voltage is a problem, Finally, we can look at whether there is a voltage detection circuit fault, the average voltage detection circuit of the voltage sampling points are intermediate DC circuit voltage. We Sanken SVF303, for example, after sampling by the DC Circuit (530V DC around) and then through the large resistance of resistance by the opto-isolation step-down, when the voltage exceeds a certain value, displays "5" over-voltage ( This machine is digital display) we can look at whether the oxidation resistance change value, whether the short-circuit phenomena optocoupler.

3.UV. under voltage. First, we may look at the input side voltage is a problem, then look at the voltage detection circuit and overvoltage fault the same judge.

4.FU. fast fuse failures. Most of the current release of the converter introduced fast melting fault detection. (Especially high-power inverter) to LG030IH-4 converter as an example. It is mainly in front of the back of fast melting sample the voltage detection, rapid melting damage to the future when the inevitable end of the voltage does not melt quickly, optocoupler isolation movement at this time, there FU alarm. Fast melting on account of the change can solve the problem. Of particular note is the rapid melting in the replacement of the former must determine whether the main circuit problem.

5.OH. overheating, mainly caused because the internal heat converter bad. We can check the cooling fan and ventilation channels.

6.SC. short-circuit fault. What we can detect whether there is short circuit within the inverter. Yaskawa 616G5A45P5 our example, we detected at internal lines, may not have short circuit, this time we look at the power module can detect possible faults in the drive circuit under normal conditions, replace the power module, should be able to repair machines .

by:gaga

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