New 2.2 Vfd For My Mill

My HY vfd's are about 2 and 4 years old. When I had one of them apart, I found that there was nothing connected to one of the Brake Resistor terminals! There was a very small trace that terminated in a hole just above one of the screw terminals - It was either P or R don't remember which one. Nothing on the other side of the board either. That made it clear as to why the brake circuit did not work. My heat sink encased resistor (70 ohm, 300 watt) came from Ebay. I believe it was in the $30 dollar range as well. Somewhere in my archives, I have the schematic of the power driver board. If I can find it in the next few days, I will post it here. It shows the components missing from most of the HY vfds. I also have the device numbers for the missing IGBT and opto isolater if anyone is interested.

There is no need for a wire wound pot. Both of my units run a 99 cent, half watt, 5k linear pot. I didn;t have any linear pots in my junk drawer so I got mine from Radio Shack (may they rest in peace)

Hi Earl, Thanks for the info...I am trying to figure out how to wire the pot to the VFD, I know where to connect ON the vfd (Vl 10V and ACM) I am just not sure which of the 3 go where on the pot switch....taking this little steps at a time. Soon hopefully I will be able to run my other setup on my cnc off Mach3
Ed

My experience with cheap pots is that they fail, get noisy or can develop dead spots over time. I deal with this all the time with electronic gear, and have repaired/replaced quite a few. Different type/construction pots suit different needs. Any decent pot will work, but many inexpensive pots are poorly sealed/subject to contamination, and have poor tactile feel, but you get what you pay for. The connections to the pot are ACM (0 V), VI (Pot wiper) and VR (+10V) terminals as outlined in the previously attached PDF file, as well as the other connections. Looking at the pot there are 3 connections, holding the pot with the shaft toward you and the 3 connection terminals at the bottom; the left terminal is ACM (0V low side), the center is VI (pot wiper which varies the voltage), and the right terminal is VR (+10V, or high side).

Thank you Mksj, That answer is just what I was looking for. You always have the answers and I couldn't ask for more. The Pots I am using are from a delay on operate controller made by SenSitrol and seem like well made pots, well as far as I know but I don't seem to know much about this sort of stuff. I went though your VFD parameter file which was very helpful. It is still coming up with a error but it only does it when I lower the speed and when it gets to 120 hz it is fine but when I start to slow it down that is when it slowly stops and then the eoun error comes up.
I will try the pot in the morning and maybe that will help.
Ed

Well I am now back to working on my mills VFD, Had to completely tear down my cnc Z axis, had about 1/8th of a inch slop in the up and down and my X axis kept stopping at the same place at full speed going left that would cause the router to keep moving to the left step by step...Put springs on x and cured that problem, the z was more involved and still a work in progress but better. Anyway I got my VFD working without coming up with a error when I would change speeds but still can not make the Pot work for speed control, PD001 and PD002 I have tried each a 0,1, and 2 not wont start the spindle at all if both are not on 0, also made sure the VI and VR jumper was right, well tried both to be sure, I also tried 2 different pot switches and same result. Cant wait to be back making things again instead of just fixing. My son is feeling so much better after having a kidney transplant in Dec. that he wants to start milling 80% lowers for AR15's...We have done one but was having problems with speed at the time. Thanks again for all the help so far. I hope someday I will be the one helping others.
Ed

Please provide the model number or a picture of the nameplate on your VFD so others can align comments with the correct manual. You might post a picture of the input terminals to confirm wiring.

Thanks for posting so quickly MKSJ, Here are the photos, I also showed the Pot with wire color and in the same position as you posted last week, Might be hard to make out in the photo of the pot but should show the wire colors are in the same places you posted last week. I have to say the new apple 6 plus camera takes great photos....just so darn large...lol
Ed

That wiring looks iffy in particular that black wire.

Iffy as in not connected? I seen that also and they are all in tight. I did try something since posting this morning, The readout on the VFD that came with my 3 hp spindle and vfd does have the dial so I put it on the mill I am working on and although it did work it was very slow speed on the max setting...hopefully that might help ideas too...worth a try...lol

Ok I did get the speed working using a THIRD Pot but does work now...sounds weird but I think it is just the pully setup to change speeds which came on the mill...I will be taking all that off soon to run smoother... that is a u-tube showing it'
Ed