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I have been reading up on DC bus overvoltage AC drive faults. My AC drive shuts down while running. From what I have read, this commonly happens when a AC drive is decelerating, however we are running the AC drive in local and selecting a Frequency to run at. There is no modulation to the frequency, no 4-20ma input to change the frequency while we are running. The over voltage trip point should be 810v, but when I do a fault trace, the AC drive can show me what what happening at the time of the fault. My DC bus voltages (on three different fault occurrences) were 715, 745 and 785, which are all below the trip point but still higher that normal (typically around 640). Also I have two AC drives being fed by the same power source. The other unit has ran over 800 hours without a single fault. The nuisance AC drive may run for several hours to a day without faulting but then may fault several times in a short time frame, always the same fault, dc bus over voltage.
Now I am working in the field of research, manufacturing and marketing of MV AC drive. I want to share an idea with somebody who is working in the field of MV AC drive. Is here anyone who has installed MV AC drive, or anyone who has experience in MV AC drive?
It is very common for AC drives to make a humming, squealing, or even chirping sound while operating. Having incoming filters, output filters, screened cables, or active harmonic correction systems installed can all contribute.
I worked in one plant that had a conveyor system that stopped and started frequently and spending any time in the electrical switchroom with the AC drives would drive you mad with all the noise. We didn't have any unexpected failures in the plant and everything seemed to be operating fine. Follow AC drive on Facebook.
