Well, I've had my eye out for a suitable matching motor for this drive unit for the past few months. I haven't seen any that fit my needs well, at least not at a price point I would consider. So, I'm putting it up for sale on ebay. I'm not sure of policy on links and such, so I won't put any. You can search for it. SSD Drives / Parker 514c/16
Auction is BIN, it is for the 16 Amp output model, for up to 4.5kW / 6HP capability, for DC shunt wound motors or DC permanent-magnet motors with a tachogenerator.
For someone with access to an appropriate motor, I could see this being the basis of a nice variable-speed, bidirectional spindle or something like that. Just need to design a circuit for the -10v<>+10v analog I/O.
Feel free to make a fair offer if you are interested.