Symptoms: A 24kw Fuji elevator special inverter, the fault is that the elevator start and stop is a severe vibration, the relative vibration of the operation point.
Fault detection: It is normal to check the drive of the inverter. It is also normal to test the driving ability of the six tubes inside the module with a low-voltage 40v with 10 amp current. That is, when the current detection circuit is checked, it is found that the A7840 on the board is not Normal, there are suspicions of aging, the fault input 100 millivolts for me, the output is only 0.234v, and the normal A7840 output voltage is about 0.79v at 100 millivolt input.
Failure analysis: If the current detection fails, that is, the voltage after the current detection has a large deviation, this voltage is processed into the cpu, it will affect the frequency of the final six output pulses of the inverter, and the current drawn by the current sampling is entered. After cpu is also involved in the calculation, eventually affect the output pulse of the six-way, so the motor jitter.
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