HY Series (Huanyang) VFDs, setting maximum speed?

I have one of these ubiquitous inverters but there is one parameter that has stumped me.

I have got it working with external switches and potentiometer so can run in forward and reverse at any speed up to 1440 RPM. I want to run the motor at higher speeds but cannot find how to set the output frequency above 50Hz.

The supplied manual is very poor (I'm being kind!) but with perseverance and luck I have fathomed most of it. A Google search returns scores of results with lots of users going through the same learning curve as me,

If anyone has one of these VFDs and has got it working at higher than 50Hz, I would be grateful for any tips.

Ian P

I think I got some settings from CNCZone

Martin.

Martin

Oddly I did read that post earlier today and somebody had exactly the same problem. I thought I had tried the suggested fix this morning but as I did so many other changes I could have actually missed that one. I'm going to have another go tomorrow.

Ian P

FIXED!

Parameter PD 072 (described as 'Lower Analog Frequency' was the culprit.

Thanks to Blowlamp

Ian P

I have one of these VFDS had it for a while now and could not be more pleased with it, it was messy to set up but it is faultless now ( touches wood). It is a 2.2 kw unit and my motor is a 1.5 kw 2 hp motor, it runs and starts quite happily from a 13 amp socket, I have max current set to 7 amps as stated PD072 sets max frequency and PD 073 sets min frequency, I have mine set to 60 and 40 respectivly, not too sure about slowing the motor down as this results in an increase in current consumption and some heating of the motor.I have a remote pot for speed control and I have also fitted a pot to the main unit as there is a position on the PCB to do this, just something to try I suppose as I can only use one.As anyone else got one of these units as they do not seem to be recommended by people who seem to know about these things mainly saying the build quality is poor, so it seems only time will tell if they stand the test of time,I have had mine about 4 months now cost £70.00 and I like it.

John

> so it seems only time will tell if they stand the test of time

I was impressed that my Jaguar Cub from Transwave has a four-year guarantee!

Neil

The only thing I would moan about with mine, is the noisy cooling fan it's fitted with. Apart from that it's been faultless.

Martin

I like them as well (for the money!).

The only thing you should note is the modbus code - forget about using it with any "proper" gear, they had their own ideas about the implementation when they coded the drives and it does not "conform" with the standard.

Mark

I have been using my VFD since mid December and its been fine.

As John mentioned, the initial setting up could be easier but I doubt the manufacturer will correct or improve the manual though.

There are a couple of things I found a bit weired, one is the inordinate delay after switch on before it acknowledges the fact that it is powered up. (When new, I powered it several times and thought I might have to return it as it seemed dead) the second thing is the FAN!

I only used the lathe a couple of times before I put a switch in the fan lead so I could turn it off when the lathe was not running. I have since fitted an electronic thermostat so the fan only come on when the VFD heatsink gets hot. I have set it 40 degrees and so far the fan has come on only once!

I use the VFD over an output frequency range of 5 to 150Hz and experience no motor overheating eat all. At low frequency the motor torque is low so its never going to be doing much heat generating work, at higher frequencies the fan is turning faster so the motor looks after itself.

Ian P

Ian,

I am just about to buy a sinusoidal filter (load reactor) for some of mine. One machine I have two on is causing some issues due to the carrier frequency but that is about to get fixed! One item of interest is the requirement to use a filter on the output if the motor is not rated for inverter use - look on the manufacturer info and they all say the same thing, even the expensive "proper" inverters.

Mark

Well, you learn something new all the time!

I knew about the non conforming Modbus, but the filter on the VFD output is new to me. I have looked in the three different (proper) VFD manuals I have here, but cannot find any references to filters other than on the mains input. I wonder what the filter does and whether it can do it over a range of frequencies.

What I did learn thought that it is OK to have more than one motor connected to the VFD and that the second motor can be switched on and off. Its not something I'm likely to need but previously I was always under the impression that the VFD outputs should be wired to the load directly.

Ian P

Ian,

Yes, the multi-motor thing was new to me also (I also came across that when I was looking into the motor reactors).

The filter (reactor) filters out the carrier frequency - or rather, smoothes it out, and this is the reason for using them on non inverter duty motors. By filtering/smoothing the carrier, the motor see's something much closer to a sine wave and is not subject to the "ringing" etc. from the square wave carrier wave.

If you read the bottom of page 12 in the Huanyang manual, it mentions the use of a filter/reactor there for long cable runs or non "dedicated" motors. Read any of the other manuals and it will be in there associated with the basic wiring/integration instructions or it will be mentioned under accessories in the manual.

Mark

PS, should have mentioned that they are designed to work over the inverter operating frequency - IE. up to 400 Hz

Edited By Mark C on 13/02/2015 20:28:41

I can see the note you mentioned at the very bottom of page 12 but my interpretation is that the reactor is used with the VFD but they don't actually say where to put it!

They explicitly state that capacitors and inductors should NOT be connected to the VFD output (in the text preceding the paragraph you mentioned.

A quick websearch throws up lots of reactors for use with VFDs but the ones I see are for the VFD input.

Ian P

A bit more Googling has revealed (to me) several 'Load' reactors specifically for VFD outputs. I get the impression that they can improve a system but I suspect they add a lump of money. My experience of VFDs has been acquired over the last 15 years with seven motor/drive setups. So far I have not had any noise, trip, or harmonics problems but I hope I dont have to get involved with reactors in the future.

Ian P

Ian,

Depending on the seller, they are a little less than the price of a cheap inverter (£50/60 ish) and they do have an impact - certainly on electrical noise. Take a look at this page **LINK** for some info. It is just a page at random from searching Google for "load reactor wiring) but it has a good description and some illustrations of the effect. My scope is analogue (code for old) otherwise I would put up a print of the output that I have. It illustrates the problem nicely at exactly 5 KHz which is the carrier frequency I have set. Further reading indicates that the carrier needs setting at 4 KHz if you feed via a reactor but I will wait and see the documentation when I get them.

Mark

I should have said, I also have had a number of drives running on old motors with simple (un-screened) wiring and have had no ill effects, but my big lathe has a special motor that would be a problem to replace so I will take the advice (based on the evidence from the scope) and fit one.

Edited By Mark C on 13/02/2015 21:31:51

The low torque/low Herz problem can be eased by upping PD009.

I tried it first with 5V and could stop the 125mm chuck with one hand when at 5 Hz.

It has been set to 22 V and I cannot stop chuck with two hands.

The translated manual uses more words than elsewhere to warn agaist being to greedy and put in a to high value here.Can someone here explain what is at take?

I'm not familiar with the PD009 parameter. But I suspect the issue is as follows. In a basic model of an induction motor torque is proportional to winding current. So the only way to increase torque at low speed is to increase current. This can be direct or indirect. A direct parameter simply controls the current at a higher level. Indirect means that the parameter controls the applied voltage, over and above what is needed to supply the motor rated current. Higher voltage means a higher current.

So far so good, but higher current means more I squared R heating so the motor will run hotter. I expect that's the issue regarding the warning. Too much over-current and you may overheat the motor in short order.

Andrew

Thank You Andrew for explanation that made me understand the chinese/english manual better.

Programme step 009 sets a voltage and 006 a frequenzy.

At this point the voltage/frquenzy curve can can be made to have a kink(both directions ) or none.

My friend has been using a Huanyang VFD for more than 4 years and hasn't had any problems. Regarding electrical noise which we shouldn't be creating, I don't think it actually effects the inverter. However, it my be a problem for your neighbours radio, TV and other audio devices, in a similar manner to what the old type car ignition system did years ago. I wondered if a filter unit as fitted to the input of a washing machine would be of use on the input side of a VFD, there are plenty around. A simple way to test for EMI is to put your VHF radio close by the lathe motor wiring. After a few hiccups helping my friends with their Huanyang VFD, I made a program list and should any one like a copy please send me a PM. Oh, and by the way, I'm know expert in VFDs, just a plodder. john

Thanks, that helps. The normal volts/hertz curve below base speed (at 50Hz) is often a 1/f curve. But of course that can be tweaked, as set by the parameters. The parameters can also be used at very low frequencies where winding resistance has a disproportionate effect and the 1/f curve is no longer adequate to maintain current.

With regards to interference issues my take would be as follows. I'd agree that the VFD itself is unlikely to be affected. On the input side the lower power and/or cheaper VFDs do not have power factor correction on the input, just a rectifier and capacitor bank. So the current draw is very non-linear, creating current harmonics in the mains network. That's not good. An (COTS) external filter is needed to reduce harmonics below the regulated limits. On the output side the cables will definitely be producing radiated interference, as the signals are PWM with reasonably fast edges. The radiation can be greatly reduced by shielding the cables. Filtering is generally a bad idea on the output. Whether the shielding should be grounded at one end, or both ends, is controversial, so I'll keep my own councel on that.

If by VHF one means FM radio then I think a long or medium wave (AM) radio would be better to detect radiated emissions. An FM receiver normally has a limiter before the discriminator to ensure that any residual amplitude variations do not affect the output of the discriminator. One of the claimed advantages of FM is that it has high immunity to impulse (ampiitude modulation) noise.

Andrew