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Renewable Energy Q&A / Re: Max winding temp
« Last post by lighthunter on April 24, 2022, 07:01:37 am »Hi Pete! This is great information! Reminds me of a time years ago when i had a pump failure on a laser and no replacement, i found an R.O. pump and plumbed it in but it didnt have enough flow. I put an AB vfd on it and turned the freq up and it worked, i want to say 76hz it ran very warm but got us through till oem part came. In this case we'd do the opposite. I have already tried reducing max output to 70% which helped but still overheated. I'm guessing by what your saying, the scaling needs to be adjusted. So that we hit 400v at 52hz instead of 60hz. Some drives have an autotune for this.
Trying to wrap my head around all this... if switching connection to wye works that would mean the 400v is too high for 100% duty cycle in delta, (magnetics are saturated causing excess current wasting energy in heat?) If reducing freq and maintaining 400v in delta works, then magnetics were too weak and allow too much slip for load applied causing excess heat?
So there are at least two maybe 3 possibilities to improve this situation without a motor change. Thats good news!
So far the reps from CP have not been people who know anything about motors or vfds, its been more like... "let me talk to someone and get back to you" I look forward to trying this information and getting rpm vs freq information for before and after.
Thanks and have a great day!
Trying to wrap my head around all this... if switching connection to wye works that would mean the 400v is too high for 100% duty cycle in delta, (magnetics are saturated causing excess current wasting energy in heat?) If reducing freq and maintaining 400v in delta works, then magnetics were too weak and allow too much slip for load applied causing excess heat?
So there are at least two maybe 3 possibilities to improve this situation without a motor change. Thats good news!
So far the reps from CP have not been people who know anything about motors or vfds, its been more like... "let me talk to someone and get back to you" I look forward to trying this information and getting rpm vs freq information for before and after.
Thanks and have a great day!