The reduction in performance is what I would be wary of, you are going to get it tripping if you start pushing it.
You should find the manual no probs from Rockwells literature Library.
One of the ones I have is
Publication number  2098-IN003E-EN-P

Hood

ok, so i have a drive and motor mounted and wired. Time to set some parameters in the Ultra3000 drive. But allen bradley won't let me download the software because i'm not the registered owner of the product and/or the serial doesn't match their records. Does anyone have the Ultraware software they can share?

ok nevermind i think i got it.

Hood,
Do use step/dir or step up/step down mode? I have it rotating at an rpm thru Ultraware but not so successful in mach3. On a position command, it oscillates wildly and faults out

Hood,
On a position command, it oscillates wildly and faults out

That sounds like drive/motor tuning needs to be done.

Ok, It needed to be set on step up/ step down mode. Now i can manually jog the spindle but i still have problems. I keep getting an e21 error which is auxiliary encoder error. It seems i should be able to disable the auxiliary encoder but i cannot find the setting anywhere in ultraware. I'm using version 1.83.

and the motor will only go in one direction. manually jogging the spindle thru mach3 seems to be fine, just one direction only. If i command a G0 C180. then back to 0 then 180 again, it will get an e21 error.

Not sure what controller you are using but if it is from Mach then Step/Dir is what you want to be using.
 You should also really be using differential Step/Dir signals rather just single ended, so maybe you will need to make up a line driver.

E21 error is to do with the step/dir signals, they are not good enough and hence the drive is faulting with that error.

Hood

hood,
the drive is an ultra3000 2098-dsd-030x I'm using a breakout board that has single ended or differential. Currently i'm using differential. I'm a little confused on the inputs. I thought i would have to specify somewhere what the actual input is.

You have to tell the drive that you are using Step/Dir inputs, see first screenshot.
Next you have to tell it if you want any gearing between the step inputs and what the drive sees (second pic). For example if you are just using the parallel port then you may not get the spindle turning very fast due to the pulse limitations of the parallel port and the kernel you have set. So what you would have to do is set some gearing in the first box. If you had it 1:4 then what the drive would do is multiply every pulse from Mach by 4.

As far as the inputs for the Step/Dir they are on specific pins, 4,5,6,and 7 if I recall. You may also need pin 2 connected to the same Gnd that your differential signals are connected to.