Hi,
Well, I may not be able to offer much help, but I'm about to go down the same road you are and figured i'd try.
The error looks to be position limit errors, based on the manual. Links provided if you don't have it. The pdf from leadshine doesn't work for some reason, but the other site does.
If you haven't, you may try to download the software, connect the drive to the PC via serial,(may have to make a firewire to serial cable, pinouts are provided in spec sheet, or buy a cable) and run some tests and look at what its configured for. You can also watch the following errors. At least it will give you some confirmation of whats going on.
I actually was looking at your machine when it was for sale, but already have a MD001 ready to go on the stand. Long road to CNC though. After seeing that, it made me curious about the closed loop stepper idea, so i bought one of their ES-D1008 drives to test using my own stepper/encoder. Though its not on a machine. I was high thinking about going this route, but just wasn't sure how well they would work on this machine. I PMed the original owner about it, but got no response. So, not to hijack your thread, but how do they perform other than the Z?
Also, has slowing the up/down speed had any affect?
Hope you get some better results.
jon
http://leadshineusa.com/productdetai...odel=ES-DH1208
Leadshine ES-DH1208 easy servo/closed loop stepper drive