![]() You'll need to work it out from frequency and pulley ratios. A handheld RPM meter is the next best thing. If you have a spindle speed sensor then this is easy. Your drive may also need tuning to suit your motor, much better to do this before you make your setup more complex and getting it going this way can save you some confusion.Īt this point you need to figure out the top speed your setup will do. Most drives need to be told to take their commands from an external set of controls rather than their own front panel or network interface. I strongly recommend that you first get the drive and motor working with two switches and a potentiometer BEFORE installing this circuit. It also isolates the start and stop functions. The circuit below isolates the drive from the computer and converts the PWM output from Mach3 into an analog voltage for the drive. ![]() ALWAYS unplug it and wait 60 seconds before touching the terminals! This technique isĬomplicating things a little is that some drives have the common terminals of their connections at MAINS VOLTAGE!īe very careful when wiring up any device at 110V or greater. The frequency reference is a bit trickier.įortunately, Mach3 has the ability to output a square wave signal with a duty cycle proportional to the requested motor speed. Their schematics typically look like this:įorward/Stop and Reverse/Stop functions are pretty straight forward you control them with relay outputs from your PC. They also all come with some terminals to wire theseĬontrols in remotely. This is someone elses setup, but it demonstrates the principle.ĭrives typically come with a speed control knob and a few start and stop buttons on their front panel. You just need to specify how many surface feet (or meters) per minute you want the tool to see. Mach 3 to vary the speed continuously with diameter. On a lathe you can change the speed for different diameters. ![]() What's so cool about spindle speed control? Here's the little 3/4Hp unit that was given to me for the lathe: I picked up this 2Hp motor for AU$70, and it even came with a free pump that sold on Ebay for more than that! :-)Ĭlick the image for a video of the X3 VFD doing it's thing If you're looking to buy, I'd recommend Automation Direct in Australia they have 1Hp drives for about AU$250.Ī 1Hp motor will set you back about AU$100, however I'd be surprised if you can't scrounge one for next to nothing. The proliferation of drives that take single phase in and produce three phase out means that these drives are appearing in more and more Motor and a variable frequency drive are those who don't own one! The only people who say there are better ways to drive a standard spindle than with a 3 phase 3 phase drive interface circuit for Mach 3 E-Mail me if you'd like to know more. ![]()
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