Whats good VFD for spindle control with LinuxCNC?

Was planning to get a Teco FM50 for my lathe CNC conversion until I discovered that the 0-10 volt speed control input doesn't play well without an expensive DAC board to put in between. Are there any VFD's to look at that would be compatible?

wiki.linuxcnc.org/cgi-bin/wiki.pl?VFD_Modbus
and
github.com/bebro/linuxcnc-huanyang-vfd

I have used
Mesa 7i76
store.mesanet.com/index.php?route=produc...t_id=119&search=7i76
and
cnc4pc c6
cnc4pc.com/c6-variable-speed-control-board.html


Rick G

I was planning on controlling my Yaskawa VFD directly using the 7i76 spindle (analogue "pot") output to control the speed. I wasn't aware that there was a problem. Can anyone point me a a thread that explains the issue?

The SPINx1 s a one channel isolated digital potentiometer intended for spindle control. The SPINx1 takes three TTL level signals, PWM, DIR and ENA and has four isolated outputs: CW, CCW, ENA and VOUT. VOUT is a Analog voltage proportional to the PWM input signal and the Analog reference voltage (5 to 18VDC). The SPINX1 outputs 0 to 100 percent of the supplied voltage, its a potentiometer replacement. Input voltage must be from 5 to 15V.

JT

Aha, seems I'm worrying about nothing. That's how I expected it to work. In my paranoia, I misread Rick G's reply to mean he needed both a 7i76 AND a CNC4U board. In fact they are alternative solutions.

Robotwizard wrote: Was planning to get a Teco FM50 for my lathe CNC conversion until I discovered that the 0-10 volt speed control input doesn't play well without an expensive DAC board to put in between. Are there any VFD's to look at that would be compatible?

In between what?

Are you wanting a VFD that will run from a parallel port? If not, can you be more specific about what you are trying to achieve?

You might find Modbus to be easier, and rather more flexible. I have found the Huanyang VFDs on eBay to be cost-effective, and they work very nicely with LinuxCNC, the hy_vfd HAL component and a £1 USB to RS485 adaptor.