965.2.1 Basic parallel UPS wiringAssume that you already finishe the AC cable connection for the parallelsystem.Remove the protective cover of the parallel ports, and then connect UPS one byone with ‘parallel cable’ (25pin, as accessory) to be a close-loop (as shownbelow):To reduce the risk of parallel system damage:1. Please use the configured ‘parallel cable’ which is accessoried in UPS!2. After tightening ‘parallel cable’, please lock with ‘parallel cable locker’ (asshown below) to prevent the parallel ports suffering an unexpectedpulling force and causing the parallel system fault.

Eaton 9SX Series Manual