Tips for Newbie Huanyang VFD users
Hi Guys
Well, building and operating a CNC router is certainly a learning curve - in many new areas.
i realise that for gurus like Rod and greg, this might be a little bit like teaching your grandmother to suck eggs, but nevertheless, here goes with some salutory lessons that I have learnt during the past two days.
As I have already explained in another post, I 'upgraded' my Bosch die-grinder to one of those Chinese spindles.
i purchased a Huanyang HY0D523b 1.5kw VFD inverter and a 'matching' air-cooled spindle from Aoran Bai in China.
Price was quite good and so was delivery - all arrived with nothing broken and very well packed for transit.
After seeking and getting advice (very good advice) from Greg, I contacted my local electrician who professed to knowing about VFD's and arranged for him to do the wiring.
All went coparatively well until we fired up the beast. The spindle only turned very slowly - I would estimate at about 200 to 300rpm - and then after only a very short time - about one minute or less, smoke started coming from the spindle and when we switched it off it was extremely hot - too hot to touch.
Oh, Oh.
My 'sparky' started to look very worried, and proceeded to check his wiring. All wiring appeared to be correct, so we 'read' through the very sparce 'manual' for the VFD which I had to download from the web as nothing came with the machine.
After reading the manual, and altering all the parameters that were indicated, and re-checking the wiring, with great trepidation we started the machine a second time.
This time, we managed to turn it off before we got any smoke, but the spindle was VERY hot in only a matter of around 30 seconds.
At this stage, my 'sparky' threw up his hands and explained that he did not know what else to do.
In desperation, we turned to the CNC forum, and after some searching, found an article hidden amongst the other gems which talked about over-heating of these machines.
Eventually, we worked out what needed to be done, and this necessitated changing a couple of parameters that ARE NOT INDICATED CLEARLY IN THE MANUAL.
After doing this, the spindle worked perfectly.
So - for the possible use by any others about to venture down the air-cooled spindle route, here are the parameters that need to be changed on the VFD BEFORE you attach the spindle and turn it on.
Parameters need to be changed in a specific order, not simply p1, p2, p3, etc.
First:
Change PD001 Source of Run Commands to '1'
Change PD005 Max operating frequency to 400hz
Change PD004 base frequency to 400hz
Change PD003 Main frequency to 400hz
Change PD006 Intermediate frequency to 2.5
Change PD008 max voltage to 220v
Change PD009 Intermediate voltage to 15v
Change PD010 Min voltage to 8
Then..............
:( Change PD011 frequency lower limit to >100hz
*** This is the most important parameter for air-cooled spindles and is what will determine whether you burn out the spindle or not.
What is not documented and is crucial, is that the internal fan in air-cooled spindles DOES NOT START IF PD011 is set for less than 100hz.:((:((:((
To be completely safe, it is probably better to set this for something like 120hz - doing so only chops off a few revs at the bottom end of the scale and will ensure that the fan works every time you start the spindle.
I can see now why you guys like the water-cooled versions, but after sorting things out, the spindle is now running smoothly and I don't have to worry about coolant, etc.
Finally, Change PD142 rated motor current to as high as you can (the inscription on the motor says 8amp but the PD142 will only go to 7.
The Change PD143 Motor pole number to either 2 or 4 (4 is the factory setting and seems to work OK), then
Change PD144 Rated motor revolution to 3000 - (when you multiply this 3000 by the Min voltage of 8, you get the top speed of the spindle - 24000 revs.
After thi, it should be OK to attach the spindle to the VFD and turn it on. best of luck.
Anyway, as I said, this is probably old information, but I had some trouble tracking down all the individual bits - particularly the bit about fans in air-cooled spindles not working under 100hz, so if this saves someone 'smoke', I guess that it is worth repeating here.
Cheers
Noel :U :2tsup: