do you not have the machines maintenance manuals? as this is where i found 99% of the info ineeded for the TRA31 drives
here is the maintenace manual for the TRA30
the 30 looks like it might have same as the 31 on ZP1 as voltage etc look same pin numbers but with out seeing a full ZP1 layout with pin naming i coudl not tell you.
see here for my TRA31 info it may or maynot help you.
http://www.cnczone.com/forums/showthread.php?t=77549 (Mitsubishi TRA41 servo Drives - interface help please)
sorry can not help any more