Originally Posted by
DelMar63
Hello guys!
I just got a HY VFD model HY02D223B 2.2 Kw with 2.2 Kw spindle. I managed to make the right setup and I work it from Mach3. Turn on/off and regulate the speed too. But I have a problem of accurancy. Meaning that when I measure the output of BoB at 0-10 pins without connections made, the BoB send the right signal. That means 10 v to full speed 24000rpm, 5v at 12000rpm etc. But when I establish the connection to VFD at ACM+VI pins I take the measurement again and at full speed the signal is 8.6v and lower than 4v at 12000rpm. Of course the VFD shows at full rpm around 20520 and at half speed somewhere around 9850rpm. Mine BoB is working in a range of 12-24 v and I provide 19 v @ 3 A and at USB 5 v @ 15 A. At my first attemp I used a shielded cable of 2 pairs for the signal and I also tried to erth the shield, but then the voltage was decreasing a litle bit. Then I changed the cables with a twisted one cat5 with 4 pairs, but not luck at all. the same problem with low voltage at full speed and at lower speeds too. Is there any logical explanation or something I can do to fix this problem ?
Note: Every time to I turn the control to VFD panel and use the potensiometer, everything works fine.