Thread: Tips for Newbie Huanyang VFD users

As it turns out, I do not have a HYUNYANG Inverter but an XINFUTAI.
However, I hope I can get some help anyway.
I do not have RST connectors, only RS and E.
The connector with the N is sealed off with silicone.
I connect the + wire to S and the -wire to R, switch on the power and it says "hello" flashes and goes to 00000. then it says Lu0 and trips the circuit breaker.
If I reverse the power wires, the circuit breaker trips immediately.
Where am I supposed to connect the negative wire?
IMG_1688.jpgIMG_1683.jpg
Thanks

Hi saisay

There is no positive and negative wire. The supply current is 240 volts alternating current. You should connect one of the two power wires to each of these terminals and the earth wire to the earth connector. So if the wires are coloured brown and blue then one of these wires is connected to one of the terminals and the other wire to the other terminal. The earth wire goes to the earth terminal. Use an ohmeter to test that the earth wire is indeed connected to the earth pin of the power plug.

At the other side there are three connectors for the spindle motor. It does not matter which of these wires is connected to which terminal. If the motor turns the wrong way when you tell it to go forwards then just reverse any two of the three wires and this will reverse the motor.

So I have a 3 pin plug connected to red (power), black (No Voltage), yellow/green (Earth) wires.
Red goes to R or S,
Yellow/green goes to E,
with no T connection, where does the black go

Oh, come on Saisay, Bob just explained it to you.
You just have an old cable with red & black instead of the current standard blue & brown.
Are you sure you should be doing this yourself? I think you should get someone who knows at least the basics of electricity - or a sparky.
You are risking your life by the sound of your questions. Please dont touch the power connection any more by yourself.

I have to agree with Joe saisay.

I explained it all quite clearly but you obviously have no experience with mains power at all. Continuing could kill you. Get advice from someone who can physically show you what to do in situ.

Yes, and I also have a 15A brown, blue, yellow/green cable for the workshop once I figure this out, but the old cable will do for the testing.
Maybe this old brain is a bit heavy but I would rather ask 3 times and survive than not ask and lose my life.
Got it?
Conversant in electrics but not in electronics.
In my time we called it positive and negative, a rose by any other name still smells like a rose.
We also used to say red/brown = hot, black/blue = cold. In my time we didn't use English either but if I used my native language, you would not understand it
Any other inverter has R and S for incoming power = hot and T for no voltage/return to power source = cold.
This inverter has no "T" and when I connect brown/red to "S" and the blue/black to "R" it works for 5 seconds before tripping the circuit breaker, if I swap the wires the circuit breaker trips immediately.
Obviously neither work so my question still is, where should the blue/black go instead?
If you want to, you are welcome to travel up here and fix it for me, nobody else around here within 100 km.

Originally Posted by SAISAY

Yes, and I also have a 15A brown, blue, yellow/green cable for the workshop once I figure this out, but the old cable will do for the testing.
Maybe this old brain is a bit heavy but I would rather ask 3 times and survive than not ask and lose my life.
Got it?
Conversant in electrics but not in electronics.
In my time we called it positive and negative, a rose by any other name still smells like a rose.
We also used to say red/brown = hot, black/blue = cold. In my time we didn't use English either but if I used my native language, you would not understand it
Any other inverter has R and S for incoming power = hot and T for no voltage/return to power source = cold.
This inverter has no "T" and when I connect brown/red to "S" and the blue/black to "R" it works for 5 seconds before tripping the circuit breaker, if I swap the wires the circuit breaker trips immediately.
Obviously neither work so my question still is, where should the blue/black go instead?
If you want to, you are welcome to travel up here and fix it for me, nobody else around here within 100 km.

Positive and negative are relevant ONLY to DC; for A/C there is active and neutral. They are one and the same thing once they are connected up and working, unlike DC which retains its positive and negative ion flow.

One of the wires (and it shouldn't make one blind bit of difference which one) goes to 'R' and the other one goes to 'S'. If it does make a difference then you are doing something that is wrong or there is a problem somewhere with your electrics or wiring. Test that there is no circuit between the earth and the other wires of the cord. If it continues to blow then get the lot tested by someone who is a certified electrician and knows what they are doing and who has a depth of knowledge equal to the task.

What is the amperage of the circuit breaker that keeps tripping?

Originally Posted by Bob Willson

Positive and negative are relevant ONLY to DC; for A/C there is active and neutral. They are one and the same thing once they are connected up and working, unlike DC which retains its positive and negative ion flow.

One of the wires (and it shouldn't make one blind bit of difference which one) goes to 'R' and the other one goes to 'S'. If it does make a difference then you are doing something that is wrong or there is a problem somewhere with your electrics or wiring. Test that there is no circuit between the earth and the other wires of the cord. If it continues to blow then get the lot tested by someone who is a certified electrician and knows what they are doing and who has a depth of knowledge equal to the task.

What is the amperage of the circuit breaker that keeps tripping?
15A

Well, I just had 2 certified sparkies here and they were as stumped as I was why there is no "T" connection.
They were the same ones who installed my machinery 6 months ago and guess what they kept on tripping the circuit breaker as well.
Also, they had no problems with semantics whether I said positive/active or negative/neutral. They knew what I was talking about.
Neither did they care about the colour of the wires red/brown, blue/black just as long as they were connected correctly.
They actually told me what I had tried to do was correct.
The stumblimg block was the earth which was non-existent in the original inverter and took a bit of working around to connect correctly.
Together we worked it out and it is now working.
Wolffie

Originally Posted by SAISAY

Together we worked it out and it is now working.

So what was the problem that was causing the breaker to trip? It surely couldn't have been the lack of an earth connection?

Actually, it was where to connect it.
It would work without the earth connected but that is too dangerous, so we had to find a screw that did not short the power out and still grounded the inverter.
Ended up using this one and just connect all 3 E wires to the same screw.
ConnectionFound.jpg
Now both inverters are working.
Cheers
Wolffie

Originally Posted by SAISAY

Well, I just had 2 certified sparkies here and they were as stumped as I was why there is no "T" connection.
They were the same ones who installed my machinery 6 months ago and guess what they kept on tripping the circuit breaker as well.
Also, they had no problems with semantics whether I said positive/active or negative/neutral. They knew what I was talking about.
Neither did they care about the colour of the wires red/brown, blue/black just as long as they were connected correctly.
They actually told me what I had tried to do was correct.
The stumblimg block was the earth which was non-existent in the original inverter and took a bit of working around to connect correctly.
Together we worked it out and it is now working.
Wolffie

Hi Wolffie

I am really happy for you and that you got a sparky to help you and that it is all working now.

The only reason for the 'T' connection is if you are intending to run the VFD from 3 phase power. I too understood what you meant by positive/ neutral etc, I was just advising you of the correct terminology.

As RustyArc says, the lack of an earth would not have caused the circuit to blow, so what was the reason for that happening?

Whatever, congratulations on getting it all working, now get cutting.

The reason was lack of an ENGLISH manual and the knowledge of which screw to use for ₸.
(somebody please insert an earth symbol icon)
The sparkies got confused about the single phase/3phase concept when there are only 2 connections and the third not having a screw in it. They didn't read Chinese either
We decided not to worry about it, seeing I don't have 3 phase anyway.
The one suggested by the seller "N" must have been connected somehow to the circuit board and hence blew the fuse.
Frustrations probably got the better of me, then I forget the English words
I have now had the spindle running, albeit VERY slowly, so now it is just a matter of figuring out how to control the speed and setting up the water cooler. It got very hot so I wasn't game to run it for any length of time, kept getting the Ol message.
Still waiting to hear from the manufacturer about an English manual.

Aha. I think, from memory, the N connection is the negative of the DC bus and is there as part of the external braking resistor option. You certainly should not connect anything from the mains to it, including earth, and doing so certainly would trip the breaker.

Originally Posted by RustyArc

Aha. I think, from memory, the N connection is the negative of the DC bus and is there as part of the external braking resistor option. You certainly should not connect anything from the mains to it, including earth, and doing so certainly would trip the breaker.

So we found out