ATV 930

5 comments

eltech Power-User Join Date: Mar 2011 Location: oz Posts: 247 Good Answers: 10	ATV 930 10/06/2021 5:07 AM
	Hello, In the past we used a single Altivar 71 to control 4 motors on a gantry crane. We used this in the open loop V/Hz function . A laser distance meter with PID control was used to automatically drive this crane into the correct position. Now we are using an ATV 930 drive, which only has vector control. It looks as though the ATV and laser are fighting each other to correct the AI into the drive to obtain the correct speed whenever there is a sudden load change. Is there a way to allow the ATV930 to work similar to v/Hz mode?
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Anonymous Poster #1	#1 Re: ATV 930 10/06/2021 6:32 AM
	https://www.se.com/uk/en/work/support/customer-care/contact-schneider-electric.jsp
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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: 29966 Good Answers: 809	#2 Re: ATV 930 10/06/2021 9:28 AM
	Perhaps the <...we...> needs to discuss the problem with the crane manufacturer. That's what the telephone is for. __________________ "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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SolarEagle Guru Join Date: Mar 2007 Location: at the beach in Florida Posts: 29975 Good Answers: 1671	#3 Re: ATV 930 10/06/2021 12:42 PM
	https://www.motioncontroltips.com/what-are-methods-for-vfd-control-of-ac-motors/ __________________ Break a sweat everyday doing something you enjoy
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SolarEagle Guru Join Date: Mar 2007 Location: at the beach in Florida Posts: 29975 Good Answers: 1671	#4 In reply to #3 Re: ATV 930 10/06/2021 3:56 PM
	https://www.machinedesign.com/motors-drives/article/21833844/how-to-choose-the-right-control-method-for-vfds __________________ Break a sweat everyday doing something you enjoy
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rwilliams Guru Join Date: Jul 2016 Posts: 1000 Good Answers: 67	#5 Re: ATV 930 10/07/2021 12:33 PM
	This is not an unusual problem, where mechanical conditions will upset the typical vector control parameters programmed into a VFD. Bad coupling, sticky or bent shaft, any unusual torque/speed curve can make vector control unstable. A 4 motor drive seems to be ripe for this sort of non-linear torque behavior. You could try tuning the vector control loop to be really sluggish, which I have tried and abandoned really quickly, but the best solution is to revert to really stable V/Hz operation, as you figured out for the original install. Your drive does have the V/Hz operation, it should show up as Custom V/Hz operation and an option on Regulator. You can’t see it because you need to enable the next layer of configuration parameters they keep hidden to prevent confusion for the typical user. I’ve used Altivar drives, they have the same basic configuration options as all VFDs, and I have yet to see a sensorless vector drive that didn’t have V/Hz mode, provided for exactly the reason you are looking for it. Hopefully the dynamic response is good enough to achieve your control objectives, patience with ramp times up and down will usually solve your control problems.
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Anonymous Poster (1); PWSlack (1); rwilliams (1); SolarEagle (2)