Common fault analysis and treatment methods of Yaskawa inverter

1. OC1 and OC3 are faulty

In many cases, the occurrence of OC (overcurrent fault) in Yaskawa inverter will be caused by the following reasons (now take A500 series inverter as an example):

(1) Caused by improper parameter setting, such as time setting is too short;

(2) Caused by internal factors, such as short circuit of motor winding, including (phase-to-phase short circuit, short circuit to ground, etc.);

(3) Inverter hardware failure, such as Hall sensor damage, IGBT module damage, etc.

In today's training, we sometimes eliminate the above causes can still not deal with the problem, OC fault still exists, of course, changing the master board is not the way to deal with the problem, at this time we can consider whether there can be a problem with the drive circuit. The detection circuit of Mitsubishi A500 inverter is commensurately strong, and only any of the above detection points can alarm if there is a problem, and it cannot operate normally. In addition to the drive power supply included in the individual drive circuit, the drive optodecoupling isolation, the drive signal reduction circuit, and the output signal feedback circuit are also included. In the previous introduction of the detection wrist can not deal with the problem of the state, special attention should be paid to whether the drive circuit can be normal, the detection direction is important to include the Mitsubishi drive circuit just introduced.

2. UVT failure

UVT is an undervoltage fault, I believe that many customers will still encounter such a problem in use, our rare undervoltage detection points are the voltage of the DC bus side, after sampling a low voltage value after the large resistance resistance resistor, and the output voltage normal signal, overvoltage signal or undervoltage signal after comparison with the standard voltage value. For the Mitsubishi A500 series inverter voltage signal sampling value is obtained from the switching power supply side, and isolated by the photocoupler, in our training process, the invention of the destruction of the optocoupler in the formation of the cause of the undervoltage fault occupies a large proportion, this scene is still rare in the previous inverter training.

3. E6 and E7 faults

E6, E7 fault for a wide range of users is certainly not unfamiliar, this is a rare Yaskawa inverter model failure, of course, the cause of the damage is also multifaceted.

(1) Destruction of integrated circuit 1302H02. This is an integrated IC integrated circuit that integrates drive waveform conversion and multi-channel detection signals, and has multiple signals associated with the CPU board, in many states, any signal emergence problem of this integrated circuit can cause E6 and E7 alarms;

(2) Signal isolation optocoupler destruction. There are multiple strong and weak signals between the IC integrated circuit 1302H02 and the CPU board that need to be isolated, and the damage of the isolated optocoupler is still absolutely high in the damage ratio of the components, so when the E6 and E7 alarms emerge, it is also necessary to consider whether it can be formed by such factors;

(3) The connector is damaged or the connector is in poor contact. Because the connection cable between the CPU board and the power board can easily break after several twists and turns, and if it is not used properly, it is easy to appear that the plug is bent and broken. Some of the above causes can also lead to the emergence of E6 and E7 failures.

4. Destruction of switching power supply

Switching power supply damage is also a rare fault of A500 series inverter, eliminating the pulse transformer damage, switching FET damage, vibration resistance damage, rectifier diode damage and other factors that we often mentioned before, the rare damage device is a M51996 waveform generator chip, which is a master chip with a variety of covers such as conduction shutdown time adjustment, output voltage conditioning, voltage reaction conditioning, etc. The central ones that are more likely to cause problems are the power supply with 14 pins of the chip, the 7 pins of the voltage reference value, the 5 pins of the reaction detection, and the 2 pins of the waveform output.

5. Destruction of the power module

The destruction of power modules is important in the E500 series inverter. For low-power inverters, because it is an intelligent module that integrates power devices and detection circuits, it can only be replaced when the module is damaged, but the training cost is high, and there is no training value. For the 5.5KW and 7.5KW E500 series inverters, the 7MBR series PIM power module is selected, and the replacement is absolutely low, and some training can be done for the destruction of such inverters.

Common fault analysis and treatment methods of Yaskawa inverter

Common fault analysis and treatment methods of Yaskawa inverter

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