I'm on a student project of building a cnc, we were struggling quite a lot to have everything worked. I found your video, and manage to get everything running in 15 minutes. Love it and thanks a lot

You did well. Very helpful

@JamesDeanDesigns I visited this video, as I was attempting to do the same thing with my setup. My VFD is the H100 VHD, like what is listed in the 1.5 and 2.2K kits in your description. I have the 110v design, as I didn't want to put a 220v circuit inside my garage. At any rate, I have the ability on mine to amplify the PMW signal going into my Analog Input 1, and if I adjust it, I can get all the way up to full power. It does skew the lower ranges though a bit. For example, at what should be 5000rpm, actually runs at 6100. But as I go up, it levels out quite a bit. I will be putting a video out next week with all of my settings. Full credit to you for showing me the way forward. I will be sure to mention you in the video, as well as link back to this one for those folks that might have the VFD that you have. Thanks for providing such wonderful CNC tutorials!👍👍👍👍

hey man. loving these videos. they're giving me a whole lotta help atm. I'm saving them for when i finally rebuild my DIY CNC again..

If you up the hz of the motor.(500 instead of 400) it will do 25% more power (just make sure you dont overpower the spindle.) Test theze settings without the spindle connected. And see how many hz the vfd puts out when you go full throttle. Then you know for sure that you wont blow the spindle.

Your explanations are thorough, the most appropriate to my skill level that I've found on KZfaq. Now that I've found someone who explains well, I hope to find the topics I need! Within the VFD enclosure I need additional power (24V) to run relays to run an enclosure fan, turn on the water cooler, and power the VFD, itself (so I don't have to keep using the power plug!). I also want to enable an emergency stop switch. I see in the comments that you added 24V power. Do you have video(s) on these, or another reference?

I wouldn't worry about the frequency-driven module, PWM is generally a fixed frequency 20kHz for example it is only the duty cycle of the pulse that changes. The trimmer on the PWM module is supposed the tune the max analog output voltage from memory, I use the exact same module on my CNC router with a BLDC motor and driver. It may be the input voltage is too low to tune up to the 10 volts needed. On my setup that PWM module is at 24v and works perfectly. So I'd definitely try to increase the supply voltage to the PWM module.

I now had the chance to do the same on my Vevor 1,5kw watercooled spindle - used the same converter you show. I was able to increase output up to 9,2 Volts what gives 23000 RPM - this is fine for me. The screw needed to be turned multiple times the whole circle, not only a few mm up or down what one might guess to show any effect on Voltage, but at 9,2 Volts converter was maxed out. For someone interested - I am using Sainsmart 4040Pro and connector named "Laser" can be used for this. I noted RPM is higher in lower regions as command sent - i.e. S12000 results in 13000RPM shown on VFD. This effect is smoothing out with higher RPM

As usual very profesional tutorials.Thank you.I have a 4040 pro(Genmitsu).Do you think it will hold a 1.5kw spindle,about 3kg weight?Ineed your expertise before I upgrade.Thank you!

I suggest you use the 0-20mA input and put a resistor between the board and the input so the 8.8V / R = 20mA, so around 440 Ohm. That could even be done without the intermediate board, but than with a different resistor of course. 3.4V / 0.02 = 170 Ohm

Hi, congratulations, you have illustrated the whole process perfectly. One thing I wanted to ask you is how much weight does the spindle have? Can the Fox Alien Vasto structure move it without problems?

Great video and learned a lot. So I’ve set up exactly as shown but although I can operate the spindle manually from the vfd , I can’t seem to get it to fire up via the grbl. I’ve programmed the vfd etc, but I’m not getting any voltage via the PWM . Is there something missing? It’s a Vasto XL controller and a H100 1.5kw vfd & spindle, but I’m wondering if the controller is malfunctioning ?

Hello, I have the same frequency converter. My question is the following, how can it be connected to the Mach 3 board and in what order would the wiring be done? Thanks!

@JamesDeanDesigns So did the replacement PWM converter worked and gave you the results you were looking for?

You could use a boost buck converter/step up voltage regulator they have a potentiometer on them that you can turn voltage up or down, set your laser output to the max then put the multimeter on the buck converter output and turn up until you see 10v then your good to go hope this helps

Hello, I have a Huanyang vfd and 2.2kw spindle 220 volts. I did not reset my vfd when I put in the settings from several videos. It worked except it would only go to 208 hertz. I reset it and now it goes to 400 hertz but the potentiometer on the front does not work. Is there a setting I can change to fix it. TIA

is their a way just to have the unit just turn on and off and the speed function left manual just using the spindle power supply cables if that makes sense

Maybe using a simple voltage divider would help? Use the converter that gives 8.8 volts, hook up on the output two resistors in series and take the signal from the bottom resistor to the input which accepts 5 volts. Value of the bottom resistor should be proportional to the sum of both resistors in the same way as 5 volts to 8.8 volts.

question: was pn07 " start again by external signal with range -1-2 " reason for tripping VFD with error OC-r ? I have same 7.5kw using on 3.2kw motor for car lift and it works but sometimes it tripps out with OC-r error. Did you had same issue ?

That was very enlightening on how this setup works. Thanks. One thing I'm not clear on, it looked like you where using the laser plug (pwm plug) on the back but leaving the switch in spindle mode not switching it to laser? I was under the impression that spindle/laser switch changed weather the output was going to that 3 prong plug or the 2 prong spindle so I just wanted to confirm when using that it should be set to spindle not laser?

Wonder whether it is worth rectifying the PWM signal, then smoothing with a capacitor on the '5V in' line.......that might work. It would be useful to know (so as to work out what type of diode configuration to implement) whether the PWM signal oscillates above and below earth/ground or whether the waveform sits higher than earth/ground.

Couldn't you wire the 5V out on the VFD through a simple relay that is controlled by the 3.3V output from your controller? That would give you 100% power on activation.

It is possible your PWM signal is not going to 100% and limiting the maximum voltage. Do you have a multimeter that can measure duty cycle and frequency or an oscilloscope to take a look at the signal?

some VFD controllers have what is essentially a voltage multiplication factor which you can set, but not all do and I don't know if this one does.

You need more input into the PWM converter - 12v is not enough for 10v output.

Why not connect red to red, black to black and yellow to white? 7:11

If you look at the booklet, you can change the rpm by doing this. you can set hz on the VFD to control spindle speed. RPM=HZ*60, if you set hz 200, RPM=200*60=12000, if you set hz 400, RPM=400*60=24000. Cheers

Does anybody know when talking about powering up the voltage converter circuit board where is the pmw power source coming from the pfd unit the laser port?? That im confused about ?