I think it really depends on the VFD. Some Siemens VFDs can have multiple stop inputs so you can setup a normal stop and then a emergency stop and more.
Dave On 12/7/2010 2:15 PM, robert wrote: > >> Why don't they have VFDs with adaptive stopping cycle, so that they >> reduce the frequency to maintain high bus voltage (to be dumped into >> the brake resistor), adaptively, as opposed to mindlessly doing it on >> a predetermined linear scale? >> >> i >> >> >> > i dont know if this is a function in higher bigger VFDs but in the ones > i have used they all had a stop as fast as it can setting, simple > putting the time to zero for ramp time and it monitors the bus voltage > to maintain a safe level. while also using a brake resistor to dump > excess with doing a DC injection brake > > i guess it depends what you call a fast stop, and from what speed.. > i must say tho with out going to a very fancy VFD thats almost like a > servo drive a VFD does not quite have the dynamics of a true spindle > drive setup > > > ------------------------------------------------------------------------------ > What happens now with your Lotus Notes apps - do you make another costly > upgrade, or settle for being marooned without product support? Time to move > off Lotus Notes and onto the cloud with Force.com, apps are easier to build, > use, and manage than apps on traditional platforms. Sign up for the Lotus > Notes Migration Kit to learn more. http://p.sf.net/sfu/salesforce-d2d > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ What happens now with your Lotus Notes apps - do you make another costly upgrade, or settle for being marooned without product support? Time to move off Lotus Notes and onto the cloud with Force.com, apps are easier to build, use, and manage than apps on traditional platforms. Sign up for the Lotus Notes Migration Kit to learn more. http://p.sf.net/sfu/salesforce-d2d _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
