I just picked up a 20 year old 37" 3 phase SCMI double headed sander. I'm in need of a phase converter but I need to know the horse power to select the proper size of converter. Does anyone know how many hp this sander would require? I looked on the motor but didn't see hp rating. At least I didn't see HP. Is there another name in German for HP? I had to look through a mirror and magnifing glass to see the plate. So if there is another name that would explain it's absence. By the way if someone has a converter that's no longer in use I might be interested.