In the daily maintenance process of frequency converters, various problems are often encountered, such as peripheral circuit problems, poor parameter settings, or mechanical failures. If there is a fault with the frequency converter, how to determine which part of the problem is, we will briefly introduce it here 1. Static test
1. Test the rectifier circuit
Find the P and N terminals of the internal DC power supply of the frequency converter, adjust the multimeter to resistance X10, connect the red meter rod to P, and connect the black meter rod to R, S, and T, respectively. There should be a resistance value of about tens of ohms, and it should be basically balanced. On the contrary, connect the black watch rod to the P end, and the red watch rod to R, S, and T in sequence, with a resistance value close to infinity. Connect the red meter rod to the N-end and repeat the above steps to obtain the same result. If there are the following results, it can be determined that the circuit is abnormal. A. The three-phase imbalance of the resistance value can indicate a rectifier bridge fault. B. When the red meter rod is connected to the P terminal, the resistance is infinite, which can determine whether the rectifier bridge is faulty or the starting resistor is faulty
2. Test the inverter circuit
Connect the red meter rod to the P terminal, and the black meter rod to U, V, and W respectively. There should be a resistance value of tens of ohms, and the resistance values of each phase should be basically the same. The reverse phase should be infinite.
. Connect the black meter rod to the N-terminal and repeat the above steps to obtain the same result. Otherwise, it can be determined that the inverter module is faultyFunction of testing report:
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