Right, so appears to be a PM type with an inbuilt tachometer. I'm not sure what the K1 and K2 terminals are for. Do you mean 0-10V from a pot or the controller? I have seen on here a Sprint drive on I think a Novamill where someone was proposing to connect it to a 0-10V supply from a breakout board (part of a Mach3 conversion?) and the drive had a big CAUTION label on it warning against gounding either side of the 0-10V input - does yours have that on it?