Enc maintenance
Failure model: EDS800-4T075G
Fault reason: E003 alarm
Failure analysis: according to customer‘s fault, the first test rectifier circuit will be used to the resistor X10 file, find the inverter DC power supply P and N. The red bar to P the black bar according to the R S T should have about dozens of European resistance, and basic balance. The opposite will be the black bar to the P side, the red bar in order to R S T has a near infinite resistance. The red table stick to the N side, repeat the above steps, should get the same results. If the following results can determine the circuit has been abnormal, A. Resistance Unbalance of three-phase bridge rectifier fault, can explain. B. red table stick today focus: P end, the resistance is infinite, you can determine the fault of the rectifier bridge or the starting resistance. 2, the test of inverter circuit should have dozens of European resistance, and the resistance of each phase is basically the same, should be reversed to infinity. The black table stick to the N side, repeat the above steps should be the same results, or you can determine the inverter module will be red table stick to the P, V W U. The measurement module of IGBT (single) found that U and N have short circuit, open the case to disconnect the output power and the driving part of the test. The measurement shows normal but U phase drive abnormal replacement optocoupler PC929 and Zener measurements after driving are normal, after replacing the IGBT tube is connected with the output part of electrical test output normal load current and three-phase output normal test.
Enc no display, phase, overcurrent, overvoltage, undervoltage, overheating, overload, grounding, parameter error, output module, display without damage, fault code, Hong Jia Wei can repair.
Jia Hong Wei repair service hotline: 0755-28916839, 13640994287 Shaw