Hey David, hey all,
my motivation is, I’m so sorry when people don’t get their VFD to work.
But this brings me into a dichotomy: In my opinion everyone should buy serious, good, and reliable hardware, especially when it comes to security (currents greater than a few amperes can burn down your place, especially if you then also solder the spindle connector instead of crimping). When I help people get their Huanyang, YL620, H100 or other Aliexpress Noname VFD set up and running, then they are happy and I am happy because they can do CNC Milling too.
But on the other hand, by doing that, I also support that these devices are manufactured and bought. And I don’t really want that!
If someone would ask me “Should I buy this chinese VFD that is under $ 150?”, usually I would say “Better not!”. I would say “Try to buy an Omron MX2 or a Hitachi WJ200”.
But what I am talking about is that it’s not only the question whether a cheap VFD is serious, good or reliable hardware, and will work and not fail, and not burn down your workshop. It’s also that a quite complicated hardware like a VFD is not a good hardware if it comes without good documentation. The higher price is justified by the fact that it costs money to write a good manual on a high technical and linguistic level, and this in many languages, namely in english, french, german, czech, spanish, italian, polish, and russian.
If people did that and bought one of these instead of buying the cheapest available VFDs, then there would be much less need for the problem that people have, namely that when they read this chinese manual junk, it doesn’t say how a VFD works, how to set it up, and what all these settings really mean. 
On the other hand, if you buy an Omron MX2 or a Hitachi WJ200, you get a manual that’s 418 pages / 420 pages long. And in this, the author not only has an idea of the language in which he writes 
, but he is also trained to write a technical document, and in an easily understandable language. And in there you can find what is missing in the cheap chinese manuals: For example, “What is a VFD? Introduction to a VFD.” Or “Frequently asked questions” right at the beginning. There are also precise instructions for a first test run. And all important parameters that must be set are presented and explained.
Also, it is practically inconceivable that after reading one of those cheap chinese manuals someone would understand how to set the parameters for the V/F algorithm. Or at least what it is .
- What is a VFD?
Introduction to a VFD. - Frequently asked Questions.
- Prepare for wiring.
- Determining Wire and Fuse Sizes
- Terminal Dimensions and Torque Specs
- Wire to the mains and to additional accessories.
- Wire the inverter output to the motor
- Ground Terminal
- Preparations for commissioning.
- Power on test
- Instructions for menu navigation.
- Mandatory settings before first test run.
- First test run.
- Evaluation of the first test run.
…
Some things that are missing in the “manuals” of the cheap chinese devices.
And that’s why people have often asked, “Can you help me to set my Huanyang, YL620, H-100 or Aliexpress Noname”? But no one asks, “Can you help me set up my Omron or Hitachi?” Why should they? They have a good manual. In contrast, with these cheap manuals that are included with the cheap chinese VFDs, you really have to say:
RTFM doesn’t always help!
Hey David,
please forgive my soap-box speech! Back to your question, I really want to be able to help people, but I don’t know if I would go as far as buying these things that people need help with and that you can’t get to work without help (and which I advise against buying). But I think that if you can read everywhere that nobody can get it working, you will not get rid of your device, but if people get it working and report about it here, then you will be more likely to get rid of your device. I really would enjoy if someone would report that with the help of some people here they get it to work. And then maybe we will achieve that somebody will buy your VFD then! It would be too sad that it could work and never does.
Maybe if you photograph the manual, maybe it can help. I’m not sure if it will, but the YL620-A manual mentioned above seems to be flawed and incomplete (cell phone photos would be great).
PS: I see no news from Rick and Luis. Will they have success?