Motor Terminal Overvoltage in Steady State by Using VFD in ETAP Analysis

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ATOM Participant Join Date: May 2020 Posts: 1	Motor Terminal Overvoltage in Steady State by Using VFD in ETAP Analysis 05/09/2020 12:59 AM
	Dear CR4 forum members, When I analyze motor starting by using VFD starter with ETAP software, I found voltage level at switchgear bus is still nice & only small voltage dip happened. But I shocked when I found the motor terminal voltage level to be 220% of nominal voltage until steady state condition. I analyze big motor rating (315 kW, 400V) with high torque load (such as conveyor). Any CR4 member ever have similar case with me? Any explanation why this overvoltage happened continuosly until steady state condition? Is it possible? Many thanks, ATOM, Indonesia
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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#1 Re: Motor Terminal Overvoltage in steady state by using VFD in ETAP Analysis 05/09/2020 1:22 AM
	__________________ All living things seek to control their own destiny....this is the purpose of life
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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#2 Re: Motor Terminal Overvoltage in steady state by using VFD in ETAP Analysis 05/09/2020 3:25 AM
	GIGO perhaps? __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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Anonymous Poster #1	#4 In reply to #2 Re: Motor Terminal Overvoltage in steady state by using VFD in ETAP Analysis 05/12/2020 7:13 AM
	https://www.acronymfinder.com/GIGO.html
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rwilliams Guru Join Date: Jul 2016 Posts: 1367 Good Answers: 105	#3 Re: Motor Terminal Overvoltage in Steady State by Using VFD in ETAP Analysis 05/09/2020 10:37 PM
	If you reversed the sign of the conveyor load, it might look like an induction generator, which would cause the voltage to be very high. In the real world, decelerating a heavily loaded conveyor too quickly can cause overvoltage. There has to be something wrong with the input parameters, in any event.
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#5 Re: Motor Terminal Overvoltage in Steady State by Using VFD in ETAP Analysis 05/16/2020 2:20 PM
	Well, that's nonsense. So something is wrong with the model in the <...ETAP software...>. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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Anonymous Poster (1); PWSlack (1); rwilliams (1); SolarEagle (1); Tornado (1)

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