Huanyang 7.5 kw VFD

**jhovel** · 7th January 2016, 01:39 AM

Now we are getting a little closer. The picture shows that your VFD is NOT a GT series inverter. So you seem to have the wrong manual.
I had no idea that Huanyang now made the -T series of inverteres which can output 380V 3-phase from 240V single phase!
You have a very interesting beast there!
Who is your supplier and what do they say about resetting the VFD? Can they get you a manual for your VFD?

Anyway, you mentioned that you bought 'a rs485'. What did you actually buy? RS485 is a communication standard not a 'thing'.
So I imagine you have a cable to plug into the VFD. Where does the other end of the cable plug in? Which software are you trying to use to talk to the VFD?

Do you know what settings you actually changed before you got locked out? I imagine you set the command input to PLC: PD001 = 2 ? From what I read, that should not prevent you from accessing the parameter list - but I'm also not game to set it to this on one of mine, in case it does prevent access

Lastly, there were several discussions on the CNCzone forum a while back showing that many Huanyang VFDs didn't have the RS485 communication hardware installed. Have you looked inside to see if the communications socket is even connected to anything? A long shot....

I suggest you register on the CNCzone and ask the reset question there too. There are some very clever electronics engineers on that forum who REALLY know their way around VFDs.

**ubute** · 7th January 2016, 01:36 PM

I'm not really familiar with Huanyang VFDs in particular yet but am thinking of getting one soon so this topic piqued my interest.

After scanning through the manual jhovel referred to earlier (which may or may not be the right manual) I'd echo a lot of his sentiments.

It seems very weird - totally bizarre - that even with PD001 = 2 for remote communication control, you cannot modify any parameters through the onboard keypad. There are no writable modbus addresses in the manual to change any configuration parameters (as would be expected - the modbus interface would typically just be for remote monitoring and start/stop type control by PLC etc) so not sure how there's any other way to change the PD001 parameter (or any other paramter) other than through the onboard keypad.

If you want to try prove a point and test if there's any remote control start/stop functionality with your RS485 adapter you can download a copy of Modscan. Then providing you know the RS485 settings for serial slave/local address (parameter PC.00 - page 74 of the manual jhovel linked) and comms data format (paramters PC.01 and PC.02 - page 75) then you should be able to write to the relevant modbus holding registers in Modscan as per page 85 - note addresses and values appear to be in Hex not Decimal. It's advisable to use a twisted pair or shielded cable for the 485 wiring because, if the VFD cables are not properly grounded, once the VFD starts running it could be pumping out a lot of RFI which could interfere with the RS485 interface making it difficult to command the inverter to stop via modbus. This could still be a tricky thing to attempt because if there's a comms protocol standard that doesn't seem to be implemented as standard across manufacturers, it's modbus! Even with RS485 you might need to try swapping wires for A/B or +/- etc as that never seems standard either! Looks like Jumper J17 is an RS485 terminating resistor so you could also try with that jumper on and off if comms are still not working.

**creative123456** · 7th January 2016, 10:33 PM

vfd video.mp4I'm trying that now I just sent them a video

**Bob Willson** · 12th January 2016, 12:07 AM

Try pressing two keys together. (At the same time)
There are 28 different combinations to try.
1+2, 1+3, 1+4, 1+5, 1+6, 1+7, 1+8
2+3, 2+4, 2+5, 2+6, 2+7, 2+8
3+4, 3+5, 3+6, 3+7, 3+8
4+5, 4+6, 4+7, 4+8
5+6, 5+7, 5+8
6+7, 6+8
7+8

**Chris Parks** · 14th January 2016, 10:23 PM

I wonder if the keypad is faulty?

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