Hi Spencer,
Most VFDs accpt a control coltage in the 0-10V range and supply a 10v power supply for powering a conversion circuit. It is prudent to put an opto-isolater to isolate this supply from your breakout board's 0V reference as some spindle speed controllers have their reference near mains potential.
Rather than building one yourself you may want to look at purchasing a readymade converter such as the DC-03V3 that we produce and sell. It should do what you need and also has a couple of small relays for controlling the VFDs, FWD/REV and RUN/STOP inputs.
http://www.homanndesigns.com/store/index.php?main_page=product_info&cPath=1&products_id=21
?
Cheers,
?
Peter
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Peter Homann
http://www.homanndesigns.com/store
On Wed 11/03/15 10:10 AM , "Spencer Chase lists@... [mach1mach2cnc]" wrote:
i read it all but it is for an air cooled spindle and the most important point relates only to air cooled fans etc. mine is water cooled so i don't have to worry about that aspect. i assume you run the cooling water all the time the machine is running even if the spindle is stopped.
i still need to know the best way to control the speed if i decide i want to. still don't know if mach3 will pwm the step or direction pin assigned to spindle in ports and pins if i choose pwm control in spindle setup. if so i just need to connect an FET driver to a voltage source to get what i need for the voltage following input of theVFD
still need to know if it is possible to have one spindle PWM controlled and the other one on/off without PWM control.
? and you will then be completely au fait with all aspects of the VFD etc
--
Best regards, Spencer Chase
67550-Bell Springs Rd.
Garberville, CA 95542 Postal service only.
Laytonville, CA 95454 UPS only.
Spencer@...
(425) 791-0309
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