Hello,
I'm converting my lathe from single phase to 3 phase power. For this I purchased a VFD. Since I also plan to convert it to CNC I'd like to be able to control the main motor speed via parallel port.
The servo's are controlled via puls/dir meaning that a clock pulse on one of the outputpins of the parallel port is used to control the position of the servo (or stepper for that matter) and 1 is used for direction (low CCW high CW).
My software allows me to use a similar setup for spindle control. 1 pin for rpm control and 1 for direction.
Does anybody have a clue how to do this. My VFD needs a 0-10 volt signal to control RPM. The driection is simply a matter of controlling a relay to put 10 volts (supplied by VFD) to either the CW or the CCW input of the VFD. It should be quite easy with a frequency to voltage converter.
I know there are more people struggling with this problem and also post on their behalf.
Erik Jan
I'm converting my lathe from single phase to 3 phase power. For this I purchased a VFD. Since I also plan to convert it to CNC I'd like to be able to control the main motor speed via parallel port.
The servo's are controlled via puls/dir meaning that a clock pulse on one of the outputpins of the parallel port is used to control the position of the servo (or stepper for that matter) and 1 is used for direction (low CCW high CW).
My software allows me to use a similar setup for spindle control. 1 pin for rpm control and 1 for direction.
Does anybody have a clue how to do this. My VFD needs a 0-10 volt signal to control RPM. The driection is simply a matter of controlling a relay to put 10 volts (supplied by VFD) to either the CW or the CCW input of the VFD. It should be quite easy with a frequency to voltage converter.
I know there are more people struggling with this problem and also post on their behalf.
Erik Jan