Sorry Johnny but my Lenze unit died so I cant test anything for you.
My Sprint 340i was not even giving its full 3.4 amps unless I stalled the spindle, but Sprint felt that 680i might be under-rated hence recommending 1220i.
It is however governed down to an I max of about 50% or 6 amps .
Having said that, since I rebuilt the motor torque is much better but I have not seen the motor draw more than 1.5A.

But as I said on another thread there are a couple of GEC gemini dc controllers on Ebay at the moment .
Looks like Boxford used these as an alternative to Lenze