变频器的主电路如何上电检修（How to check the main circuit of power converter）.docVIP

变频器的主电路如何上电检修（How to check the main circuit of power converter） How to check the main circuit of power converter for electrical work? The inverter maintenance personnel must set up the idea that the inverter module and the drive circuit have a strong joint on the fault. When the burst module is damaged, the driving circuit is bound to be impacted and damaged; module damage may also is caused by the fault of the driving circuit. Therefore, the inverter output circuit and the drive circuit must be thoroughly inspected whether the drive circuit or the inverter output circuit is faulty. For the main circuit, the electric test machine must be based on the premise that the drive circuit is normal - the normal output of the six way exciting pulse. For the maintenance of the drive circuit, see the fourth chapter of this book. After checking that the drive circuit is normal, the inverter module will be damaged and replaced before it can be put on the electric test machine. The on board tester after assembly is an event that must be carefully considered. Corresponding measures must be taken to ensure that the new IGBT module is not damaged when abnormal conditions occur. When testing the machine, the start-up time of the converter is the most critical moment. Without any protection measures, the fast power on will cause the new expensive modules to be damaged in an instant. Previous efforts to overhaul have not only been wasted, but have caused even greater losses and may have widened the scope of failures. Some maintenance personnel bombed several modules, then the frequency converter maintenance discouraged. Take the corresponding power on test machine measures, can basically put an end to the power test machine inverter module damage, as long as a little more careful, then basically no problem. Method: the power inverter module is disconnected, in fact in the circuit are connected with the copper bars, remove a connecting copper bar, the positive supply is three-phase inve