Fanuc ALPHA & ai Modules and units. There are litterally over a thousand different ALPHA and ai series amplifiers from 1994 to the current ai -B series drives. At CNC we cover aE, SVM, SPM, PSM, SVU, SVMi, SPMi, PSMi, aiPS, aiSV, aiSP and more uncommon aiR, aiC and all of the HV 400VAC versions.