Please help I’ve been through two replacements of these VFDs and they all keep frying after my wiring is like it says in the manual. I took a look inside and it looks like a capacitor melted through a relay could this be the cause since they were touching? Fried VFD
If you have had multiple VFDs fail I would double check all of the basic electrical parameters that you are setting in the VFD. The parameters for voltage, frequency, amps, max speed etc all need to be set to match your spindle. I know it is hard to gather this info from the manufacture so you may have to search for some of these settings. If you are using a HY series inverter, I have a set of notes in the recourse section that might help. HY SERIES VFD AND BLACKBOX SET-UP OPTIONS
Yes, tonight my second one got fried, I did exactly as the manual said, just like the first time, don't buy crap
neels ive bought crap vfd's and followed the below video and not had an issue . when i say vfd's, the first one that came with my machine shorted at the spindle and filled my shop with smoke ( from memory when i opened up the vfd, the short at the spindle caused smoke from the kind of area in your image, migth be worth checking the wiring at the spindle ) , i bought a second one from the orient and have not had an issue in 2 years. i think the below only applies to blackbox controllers but might be worth a look. VFD Spindle Control via OpenBuilds BlackBox Controller and Software
Mosf VFD damage comes from either - Incorrect or bad Earthing (Get an electrician to check your sockets, and let him wire up the VFD, including earthing the spindle body) - Incorrect VFD parameters (Min Freq important one, but there are lots of other potential pitfalls in there - they are quite complex devices and some incorrect parameters can really cause havoc with the inverter part of the VFD, blowing out your IGBTs
I have a 1.5kw air cooled spindle and the VFD never gets even warm. One thing I did that not many mentioned, and may not be relevant, is to add a resistor to stop the spindle. These resistors a very big but I installed it on the back of the part that holds the VFD.
