f4 drive repair, Shenyang on China (certified), drive repair on China by Shenyang Electric Limited. Shenyang on China Electric Co. (www.zsmsy.com) is specialized in the "high-low-voltage inverter, high and low voltage soft starter, magnetic switches, programmable logic controller (PLC)" of the enterprise, the company of "honesty, hard service" concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Wei Song. Static test drive repair common methods: 1, the test results of the rectifier circuit to find the next, you can determine the circuit is abnormal, A to P terminal and N-terminal of the inverter internal DC power supply, the multimeter resistance X10 file transferred, the red bar. received P, black bars, respectively, according to the R, S, T, normally when there are dozens of Europe's resistance, and basic balance. In contrast to the black side bars connected to P inverter repair, followed by the red bar received R, S, T, there is a near infinite resistance. The N-terminal connected to the red bar, repeat the above steps should get the same results. If you have to drive repair parker resistance unbalance, indicating the rectifier bridge is faulty .B. Red table when connected to the P-side bar, infinite resistance, we can conclude that the startup resistor bridge rectifier failure or malfunction. 2, the test inverter circuit will receive the red stick P side, and black bars respectively connected U, V, W abb510 on inverter repair, there should be dozens of Europe's resistance, and the resistance of each phase is basically the same, RP should be infinite. The black bar table N-terminal, repeat the above steps should get the same result, as it may determine the inverter module is faulty. Shenyang, China Electric Co. on the main business in Europe, the United States, Japan and other countries manufacturers of industrial equipment, machinery products nsk drive repair, to the world famous companies have long-term business contacts. In Germany, Japan, the United States has a liaison office. Direct purchase directly from Europe and the United States, Japan and other countries manufacturers. Similar imported products than domestic prices low, a lot of common specifications spot, fast delivery. When domestic users receive exclusive agent procurement of foreign spare parts monopoly price, we will provide a better opportunity to RMB, flexible manner. Any brand can offer in 1-3 working days. Inverter repair fault case AEG Multiverter122 / 150-400 inverter startup DC overvoltage trip this converter will not always start overvoltage trip. Inspection found the drive at power but no closing signal, the DC link voltage, which amounts to 360V, the cathode of the inverter circuit in series with a DC contactor units, after closing when the signal through the precharge pull , it is suspected adverse pre-charging circuit IGBT performance, disconnect the precharge circuit IGBT, the situation remains the same. The output of the inverter with a multimeter to check ground resistance when it is small, the investigation found that the motor terminal box to the field to get wet, after drying, the drive is working properly. As the motor terminal box to get wet, DC negative earth leakage flow through the junction box and inverter inverter freewheeling diode to charge the capacitor DC circuit, this situation should generally understood closing overcurrent tripping actually overvoltage trip. I think that when you start the inverter output voltage and frequency is gradually rising, the motor is exposed to water, it will result in a high rate of change of the output current, resulting in DC overvoltage. Shenyang, China Electric Co., Ltd. to undertake the industrial automation and control system design, installation, engineering and maintenance; professional maintenance States converter, DC governor, PLC programmer repair operations. The company is market-oriented, technology and development, quality of survival. The company has a sound management system, advanced testing and inspection test equipment, with large-scale maintenance entity, truly provide customers with the best quality service.