AC/DC/AC convertors

Hi all:

I have a couple of 5HP convertors. Are they worth anything? They are basically a unit that takes 3 phase AC and converts it to DC and then puts out a controlled AC frequency for spindle motor speed control. I have a couple
5HP and one 50HP model. I know they can be wired for single phase input as well, because I have a dealer sample at work which just plugs into the AC line. They say to derate the motor by 50% for single phase input. I was thinking of putting them on Ebay, but haven't a clue what they are worth. It seems they might solve the problem of having a
single phase line driving a 3 phase motor. You enter the
data from the motors face plate into an LCD panel and select the speed you want. They also connect to a serial cable. They are made by SIEMENS. The big one is mostly heat sink and says AC Variable speed motor drive. I'm pretty sure its rated at 50HP.

Art


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