QNK 7.5KW 10HP 220V AC 33A VFD Converter Single to 3 Phase Inverter Variable Frequency Drive for CNC Spindle Motor Speed Controller

Using this on a 3hp 3phase motor on an old lagun mill. Has been working great so far. Easy to do variable speed with. Probably one solution for those folks who have variable speed pulleys which don’t work correctly anymore.

Set up is a little confusing but once figured out has worked great for my 1hp mill

Yes this inverter works well and was pretty easy to get set up, it helped that I recently went through the programming of a similar inverter

Needed this to control a new motor for my lathe to give me variable speed without moving the drive belt (DIY upgrade). The instructions on how to program it are pretty good - no trouble following them. Combined with an RPM sensor, I have exactly what I need.

I connected it to 220VAC and I connected the 3 motor phases. And it worked. I didn't use any of the special controls or settings. I turned it on and off. Reversed directions. And varied the RPMs with the knob on the front. And I was pleased with how easy it was ti get it operating.

I feel dumber every time I read it. I’ve read it 12 times and now people are giving me crayons and calling me “little buddy”.How this manual ever made it to print is baffling. It is like someone had AI go through a dictionary and just scatter every word known to man and put them in this manual. I’m serious, this is sad that this is what comes with something that could kill you if wired wrong. Returning for sure.

I used this VFD to control a 3-phase 5-hp air compressor motor. I used the slow start function to slowly start the motor over 5 second period. I used the compressor pressure switch to control the "run" feature. I let the compressor run for 30 minutes with open lines, then let it cycle several times. No problem with the motor or the controls. The only negative thing is the manual. You need reading glasses to be able to read it and it is poorly translated. More diagrams would be helpful. Other than the manual, it everything else was good.

I have the QNK 10hp drive on 240VAC single phase running a 7.5hp 230VAC three phase motor. Works great so far. I recommend you be familiar with electrical controls/etc if you're going to be messing around with this type of equipment. It is dangerous if not setup properly.To set the main frequency (F003) and reference frequency (F004) higher than 50hz for the input parameter you MUST first change the max frequency parameter (F005) to 60hz, or it won't allow you to change any other parameter above 50hz.