Static Testing
1. Test the rectifier circuit; check the results. If an abnormality is detected, A. At the P and N terminals of the internal DC power supply of the aviation power supply, set the multimeter to the X10 resistance range, connect the red probe to P, and the black probe to R, S, T sequentially. Normally, there should be several ohms of resistance, and they should be relatively balanced. Conversely, if the black probe is connected to P, and the red probe is connected to R, S, T sequentially, there should be a resistance approaching infinity. Repeating this process with the red probe connected to N should yield the same result. If the resistances are unbalanced in any phase, it indicates a fault in the rectifier bridge. B. When the red probe is connected to P, if the resistance is infinite, it can be concluded that there is a fault in the rectifier bridge or the starting resistor. 2. Test the inverter circuit; connect the red probe to P, and the black probe to U, V, W sequentially. There should be several ohms of resistance, and the resistance of each phase should be relatively the same. When the black probe is connected to N, the resistance should be infinite in reverse. Repeating these steps should yield the same results; otherwise, a fault in the inverter module can be determined. Aviation ground power supply, 36V aviation power supply, 400Hz variable frequency power supply, 115/200V power supply, 27V DC power supply, 400Hz power supply, aviation power supply
Dynamic Testing
Following normal static test results, dynamic testing, i.e., power-on testing, can proceed. Pay attention to the following points before and after powering on: 1. Before powering on, ensure the input voltage is correct; connecting a 380V power source to a 220V-grade inverter can cause a system failure (exploding capacitors, surge resistors, modules, etc.); 2. Check if all 400Hz power source connectors are properly connected and secure, as loose connections or anomalies can sometimes lead to power supply malfunctions, and in severe cases, the system may not function properly; 3. After powering on, inspect the fault display content and initially determine the fault and its cause; 4. If no fault is displayed, first check for any abnormal parameters, reset them, and then start the aviation power supply under no-load conditions (without connecting the motor) to test the U, V, W phase output voltage values. If phase loss or unbalanced three-phase voltages occur, the module or driver board may be faulty; 5. Under normal output voltage conditions (no phase loss, balanced three phases), conduct load testing, aiming for full-load testing. Be meticulous and patient when repairing the 400Hz power source to ensure accurate and error-free aircraft startup and power-on testing.
