On 02/15/2017 08:24 AM, dragon wrote: > So some more questions about VFDs... > > What are the advantages of a sensorless vector drive and is it worth the > extra cost? > > Are there any sensorless vector drives that have a supported modbus driver? > > Is there a list of VFDs with linuxCNC modbus support somewhere other than... > http://wiki.linuxcnc.org/cgi-bin/wiki.pl?VFD_Modbus > > and the HY series of Huanyang drives?
For a basic mill or lathe spindle modifying an existing VFD HAL component to your VFD is not hard to do. There are two basic parts to the component; the Modbus connection/communication, and the VFD data/HALpin configuration. The Modbus bit needs to know what port, protocol, rate to use. Then what to send/receive on the Modbus connection needs to be set up, such as a set of VFD functions (Forward, Reverse, Stop, Brake, Speed, etc. ) and the associated the data words/registers for the particular VFD. An existing VFD HAL component will have all of this in place. It's just a matter of consulting the manual for the new VFD to edit the details. This should be easyish for someone handy at making other HAL components. For extra credit, ideally, a VFD component could just describe the available functions and options for communications. Then Modbus HAL components could be made for a mix of servers, clients and channels independently of the device details. I think work has been done in this regard, but it tends to not be widely published. :( Hmm ..., maybe here: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?ModbusToHal -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
