HI ! Rich
I am AMIT PATEL from INDIA running my own workshop ,dealing in component level repairs from last 28 years , now involved Mainly in KOLLMORGEN servo drives repairs. I have handle many such drive in 600 series i.e. 601 , 603 ,606,610 620, 640 & S748.
About the drive you need to check first whether DC 300+ is getting generated from 3 phase given, next that 300v DC is reaching to IGBT , Enable the drive with all necessary hardware etc. connected , then.... you can run the motor connected. If there is any problem you need to trace U V W circuit problems near IGBT on component level . I can repair it for you or in the extreme case provide you entire drive at a reasonable price.