QNK 4KW 5.5HP AC 220V 17A VFD Converter Single to 3 Phase Inverter Variable F...

Works well for my air compressor. Instructions are a little difficult to read, but once you figure it out, it’s pretty smooth sailing from there. The only trouble I had was with the control circuit, which is literally just a loop. I thought I had to hook up an external power source for the control circuits, but it’s literally just a loop with a switch in it, which in this case was the compressor pressure switch. Only power supply I had to hook up was for the 220 V. The unit itself is constructed of plastic, but it does not feel very cheap, it is actually quite a sturdy piece of equipment. I used a 10 hp unit for my 5 hp compressor. No overheating issues, and it also includes an internal temperature reading so you can monitor while it’s running. I would definitely purchase this again.

I replaced my old phase converter with this and have been extremely pleased with the result. I wish I had done it before as it would have saved me a $2000 bridgeport motor. I am very pleased.

I picked this up to run an Enco 3 hp vertical mill. After spending some time with the manual, I hooked it up without issue on the first try. My mills runs buttery smooth without hesitation. I like the ability to vary the speed with the turn of a dial. I remote mounted the VFD on the front of the mill for easy access. The included cable was just long enough to reach from the back of the mill to the face plate I made for the front by the master switch. I would and did buy again. Picked a 25 amp unit up for my 3 phase table saw I just drug home from an auction.

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

I was running VFD on 3 phase Mill for several years. Purchased newer 7.5HP Lathe and decided to go VFD on it also. Decided to remove the smaller VFD from Mill to use on other projects so I add a Drum switch ON/Off/ON to new VFD and operate the Lathe or Mill being side by side from single VFD. Mounted on swing post so VFD is accessible to either machine. Can only run one machine at time but for small one man shop works great.

Difficult to use. Terrible user interface and the manual is even worse but once you figure it out, works nicely.

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.

It quit working only shows 25 hertz. Was working fine when I set it up.