Well, xzy-tech removed the spindle inverter label, but there was a sticker with this "DZB 416" on it.
I googled it: most of the results came out "Dragon Ball Z" but some good soul posted a pdf manual of a similar (same manufacturer, different model) inverter. The Chinese manufacturer is Fuling Inverter - www.chinafuling.com - but their site is in CHINESE!
the link with the manual is (the pdf is too large for posting) http://www.cnc-technik-madreiter.at/...r%20manual.pdf
Well, there are 4 wires coming from handler board to the inverter. "s0, s1, s2 and -vc). Any sugestions????