Hi Anders
I solved spindle speed control of both VFDs and a Chinese DC brushless drive system using a prototype PMDX board. I believe it will be named the PMDX-106. It handles several varieties of speed input and works them in configurable concert with one another. I've got manual direction and speed as well as spindle on, direction, and pwm speed from a pair of parport pins. It outputs 0-10 volt but can be made to take the drive supplied voltage as well. You might ask Steve Stallings at PMDX about availability if you are interested. Disclaimer -- no commercial connection to PMDX but I consider Steve a friend. Rayh On Wed, 20 Jun 2007 14:22:47 +0300, "Enhanced Machine Controller (EMC)" <[email protected]> said: >Hi All, > >We've got a new vector VFD for our mill. I was setting it up yesterday >and it seems to work OK when operated from the front panel. > >I'd like to control it using EMC, and there are several options: analog >voltage 0-10V, RS-422, 10kOhm potentiometer etc. >But I also found yesterday that the reference frequency can be sent to >the VFD with a pulse train. The maximum frequency for the pulse train is >adjustable, I think the default was 2.5 kHz. > >So, has anyone worked with connecting EMC to a VFD with a pulse train input? > >I have a 5i20 with some spare I/O. Is there an existing HAL component I >could use, or do I have to write it myself ? I imagine it would create >square wave on one output pin and the frequency would respond to >spindle-speed-out (set with the S word in the interpreter) > >I saw that rigid-tapping has now been implemented. If I fit an encoder >on the spindle, how much precision is required from the EMC-VFD >combination to do rigid tapping ? I imagine the pulse train will first >be for constant rpm, then slow down to zero, then a separate I/O pin >flips the direction of rotation, and then we accelerate up to the set >reverse rpm. > >regards, > >Anders Wallin > >------------------------------------------------------------------------- >This SF.net email is sponsored by DB2 Express >Download DB2 Express C - the FREE version of DB2 express and take >control of your XML. No limits. Just data. Click to get it now. >http://sourceforge.net/powerbar/db2/ >_______________________________________________ >Emc-users mailing list >[email protected] >https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
