John, Is that three seperate drives or a combined unit? The 165 v three phase is a bit odd ball, one way of considering is to use 3 A-M-C Advanced Motion Controls 100A25 units, the only thing is they do not have a power supply but if you can use the existing DC from the old control (or build one from an existing 3 ph 165v transformer) , these units take up to 250dc and will supply 50 amps ea and 100amps peak, They are probabally much smaller than your exsisting units and if you set them for use in the torque mode you do not really require a tach.You may have a problem getting something that has the same 165v 3 ph input.
Al
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.