@Mike_Thornbury Hey Mike,
I need some help. I was all prepped to use the 3-wire cord and outlet this weekend and the Makerspace person told me I really needed to get the 4-wire outlet and cord. Realizing it would be another week otherwise, I went back to HD and bought the cord & outlet. The outlet has been installed and I know which wire is which (2 hot wires: Red& Black, a neutral (white ) & a Ground wire (green). However, I’m having a little problem figuring which screw terminals to wire them into. Actually, the documentation you provided, though helpful, I don’t think correlates with the model I have which is HY01D523B.
One confusing issue I have is with the labeling of the terminals: on the inside the far left terminal appears like the ground symbol, yet the outside label has that terminal labeled as “R” (one of the “hot” wires. Can you confirm which is correct? Though I could be wrong, it appears the outside label (sticker) has the ground symbol as the 4th terminal. Or, is that symbol something else? If the sticker label is incorrect, I may have mis-wired the spindle. Also, will this 2-pole RCD I purchased work with the 4-wire cord? I haven’t seen any tutorials that demonstrate that online.
I will post the other photos so you can see what I am talking about.missing/deleted image from Google+
When I say far left it is on the bottom part of the picture: R-S-T-??-U-V-Wmissing/deleted image from Google+
missing/deleted image from Google+
missing/deleted image from Google+
missing/deleted image from Google+
@George_Allen Your unit can do single or three-phase - for single-phase 220v - Phase to R, neutral to T, earth to S. Your 4-wire setup is foreign to me, but I’m guessing your setup in the US is to wire two separate 110V circuits into a two-phase 220V circuit, but at 60Hz, rather than our 50Hz. I can’t advise you on a 4-wire outlet. I will do some digging. As to the RCD, it detects leakage to earth, you only need two wires - phase and neutral - getting the source and outlet correct is important, though. It should be clearly labelled as to which direction the flow is. It’s a simple switch device, nothing fancy.
I believe the earth symbol is indicating the metal bar, not the screw connector. Go by the printed designations.
@Mike_Thornbury I’m now thoroughly confused. They tell me the 4-wire consists of 2 Hot wires (red & black) a ground (green) and a neutral (white). Apparently, using 4-wire combination will make it a three phase rather than a single phase.
Two hots, no neutral, ground = 240v, so for your installation: hot1 to R, hot2 to T, ground to Earth . Not sure how to put and RCD in that. It will be for hot1 and neutral, 110V operation, so if I were doing it, I would put it on one hot leg and test by, after wiring it all up, earthing the hot2 to see if it trips
The 4-wire outlet is for mixed 110v/240v operation - you don’t want that.
Get an electrician. I don’t want to read an RIP George thread. It’s cheaper than even an MDF casket 
Here is a photo from the HY VFD documentation I got from automation technologies. The Earth is E there (with the ground symbol), not S.missing/deleted image from Google+
You’re over-analysing it.
Wire hot1 to R, hot2 to T, ground to earth.
You don’t need the 4-wire outlet, that’s for mixed 110/220.
You bought from Amazon, I would talk to them, tell them you have a non-genuine item and you want your money back, and buy a 110v unit in replacement
@Mike_Thornbury I’ve begun that process. This is a nightmare.
I’m going to get an electrician…too much conflicting info
No conflicting info, just confusion at your end.
Yes, probably that too. I’m depressed.
You bought wrong, are listening to people who don’t know what they are doing, taken advice from shop assistants that don’t know what you are doing. Jay told you what to do, I told you what to do - wire hot1 to R, hot2 to T, and put a ground in. Simple