1 Introduction

Mitsubishi inverter on the development and the analysis and treatment of some common failures in previous articles have been some reports, in the domestic market , Mitsubishi because of its stable quality, strong brand , has a very broad market , and has depth of the various fields of application . For our customers , it is also a wide variety of problems encountered , the following new fault damage on some points and the corresponding three- letter approach to the recent Shanghai inverter repair centers in the process of repair Mitsubishi inverter encountered and the majority of users do a discussion. 2 Troubleshooting

Mitsubishi inverter currently on the market is the largest amount of A500 series, as well as the E500 series , A500 series is a general-purpose inverter , suitable for high starting torque and high dynamic response to applications . The E500 series is suitable for simple and functional requirements , performance requirements for dynamic lower occasions , and the prices are more advantages . The following author Mitsubishi inverter two most widely used models on the market some of the new approach and the corresponding failure to do some simple introduction:

2.1 OC1, OC3 failure

The author describes the Mitsubishi inverter before appeared OC ( overcurrent fault ) will often be caused by the following reasons (now with A500 series inverter as an example ) .

( 1 ) problems caused by improper parameter settings , such as the time is too short ;

Such as motor windings shorted ( 2 ) external factors, including ( phase short circuit , short to ground , etc. ) ;

( 3 ) drive hardware failure, such as a Hall sensor damage , IGBT module damage.

In the current service , we sometimes exclude these reasons may still not solve the problem , OC fault is still present , of course, replace the control board is not the solution to the problem , then you can consider whether there is a problem driver circuit . Mitsubishi A500 inverter detection circuit doing quite powerful, these test points as long as there is a problem with any one could be the police, can not run normally. In addition to the drive power supply circuit includes a general driver , the drive opto-isolated drive signal amplification circuit , the feedback signal further comprises an output circuit . In the case before the introduction of testing means we can not solve the problem, paying particular attention to the drive circuit is normal, the detection direction includes several components Mitsubishi just introduced driver circuit.

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